Linux BSP Release Details

Description: While V1.0B modules with their bring-up BSP are fused and do boot from the primary eMMC hardware boot area partition their U-Boot environment still gets stored to the regular eMMC hardware user area partition which may corrupt the primary boot FAT partition.

Workaround: Do NOT save your U-Boot environment or your primary boot FAT partition will get corrupted.

Description: Move to a newer mainline U-Boot for future-prove support.

Description: U-boot: "Could not initialize PHY FEC" issue after software reboot due to too low auto-negotiation timeout value.

Workaround: Do cold reboot with the reset button or power off/on.

Description: Timeouts and reads from false channels may be observed when using STMPE811 ADC.

Workaround: An improved driver is available on the toradex_4.9-2.3.x-imx-next branch.

Description: NXP released BSP L4.14.98_2.0.0_ga. Update the kernel to that release.

Description: Support the new product version [00491000] Apalis iMX8QP 2GB V1.0A with our embedded Linux BSP.

Description: -

Description: Support for Analog Audio Mic-In is added.

Description: Support for Analog Audio Line-In is added.

Description: Support to switch shared USB ports automatically from host to client mode and vice versa is added.

Description: Support for USB Host is added.

Description: Support for parallel RGB displays has been added.

Description: We decided to remove legacy update tool support from BSP 3.0.

Workaround: Stick to BSP 2.8.

Description: Update to the OpenEmbedded Thud resp. Yocto Project 2.6 release. - Drop support for the Apalis T30 and Colibri T20/T30/VF.
- Drop support for the legacy update procedure. - Drop Qt4 from the default install - Change the distro from Angstrom to Poky based but keep systemd as the default init manager.

Description: Dropped support for the Lightweight X11 Desktop Environment (LXDE) in favour of single application use-case.

Workaround: Use the latest stable BSP 2.8.

Description: Using GStreamer 1.12 from the OpenEmbedded/Yocto BSP with the MIPI-CSI OV5640 camera driver CONFIG_MXC_CAMERA_OV5640_MIPI_NV stutters (frames seem to be shown not in the correct order).

Description: for operating Wi-Fi/BT capable modules with a single antenna please have a look at the following article on our developer website:
https://developer.toradex.com/knowledge-base/operating-wifibt-capable-modules-with-a-single-antenna

Description: The MCP2515 SPI CAN controller as found on the Colibri Evaluation Board is disabled by default in favour of toradex,evalspi SPIDEV. Let us change this like on the other Colibri modules.

Workaround: Just add Status = "disabled" to the toradex,evalspi device tree node and okay to the MCP2515 one.

Description: We switched from CRDA to direct loading of the Wi-Fi regulatory domain database in-kernel.

Description: If an Android phone is connected to the Colibri iMX6ULL, then an unexpected Linux kernel bug is shown and Bluetooth stops connecting. The only solution is to restart the module.

Description: iptables -L is not supported by our default Linux kernel configuration.

Workaround: A custom Linux Kernel compilation with correct configuration can solve the issue. The correct Linux kernel configuration is e.g. described here:
https://wiki.gentoo.org/wiki/Iptables

Description: Kernel crashes after M4 firmware started. The only log message is "Starting Kernel ...".

Workaround: Enter the following commands in U-Boot: setenv fdt_high=0xffffffff saveenv

Description: The touchscreen with 7" Capacitive Touch Display may not work well when used either on an Evaluation Board with the Capacitive Touch Adapter or on Aster or Ixora.

Description: NXP released BSP 4.9.123_2.3.0_ga. Patches for the user space components are in the master branch on meta-freescale. We pulled those into the rocko branch of meta-toradex-nxp.

Description: Wake from suspend is not working on Colibri iMX6ULL 512MB Wi-Fi / Bluetooth IT.

Description: Touchscreen with 7" Capacitive Touch Display does not work when used on an Aster carrier board with a Colibri T20/T30 module.

Description: Add a device tree which targets the aster carrier board. This also enables an easier integration of the Capacitive Touch 7" Parallel display.

Description: The CAN muxing ALT2 (can1.RX, can1.TX) for these pins are labelled ftm1.RX, ftm1.TX. Fix this.

Description: The firmware might behave erratic/crash when loading using U-Boot bootaux command with an elf firmware.

Description: The Linux kernel 4.1.44-2.7.4 may report a wrong i.MX 6 SoC version upon boot:
[ 0.109969] CPU identified as i.MX6Q, silicon rev 0.6

Workaround: The later Linux kernel 4.9.87-2.8.3 does report it correctly:
[ 0.069884] CPU identified as i.MX6Q, silicon rev 1.6
You may find a fix on the toradex_4.1-2.0.x-imx-next branch.

Description: The Colibri iMX6ULL V1.0 and V1.1 HW has no discrete pull ups on the I2C bus to the touch controller. This may lead to unreliable communication with the internal 100k pull ups and the used 80kHz I2C clock.

Description: Apalis TK1 LVDS drive strength settings are hard-coded. Idea is to move those to the device tree as well.

Workaround: For now, settings can be changes in drivers/video/tegra/dc/sor.c file. Function tegra_dc_sor_enable_lvds contains writes to NV_SOR_LANE_DRIVE_CURRENT and NV_SOR_LANE4_DRIVE_CURRENT registers. Registers definitions can be found in the "Tegra K1 Reference Manual".

Description: Currently, the device tree specifies 2.5V as SGTL5000 VDDA. This is wrong, in practice, the board uses 3.3V Audio voltage as VDDA.

Description: Add support for the new V1.1A hardware revisions of the Colibri iMX6ULL products.

Description: Enforcing to build 32-bit binaries for native and portions thereof using -m32 in EXTRA_OEMAKE_class-native may lead to the following error when building e.g. u-boot-toradex:
cbootimage: Accessing a corrupted shared library

Workaround: The -m32 as specified in EXTRA_OEMAKE_class-native in recipes-bsp/cbootimage/cbootimage.bb of meta-toradex-tegra may be overridden to your liking. The same applies to the following as well:
meta-toradex-demos: recipes-devtools/mtd/mtd-utils_%.bbappend
meta-toradex-nxp: recipes-devtools/imx-loader/imx-loader_git.bb
meta-toradex-tegra: recipes-bsp/tegrarcm/tegrarcm.bb
meta-toradex-tegra: recipes-support/libcryptopp/libcryptopp_5.6.4.bb

Description: U-Boot typically tears down the display controller before handing control over to Linux. On LCD displays disabling pixel clock leads to a fading out effect with vertical/horizontal lines. Make sure to disable back light before booting Linux.

Description: Allow using MXM or SODIMM pin numbers to get or set GPIOs. This also allows for easier code porting from one to another Toradex module.

Description: In OE we build the device trees listed in conf/machine/xxx.conf (build-time variable KERNEL_DEVICETREE) and put them into the image. In the update.sh script we currently also have a variable KERNEL_DEVICETREE with a list of what to put on the update media. We could patch update.sh in OE during image creation time, so that update.sh contains the list from conf/machine/xxx.conf rather than having to maintain that list in both places.

Description: The apalis-tk1-mainline machine fails poweroff/shutdown and instead just reboots.

Workaround: The rocko-next branch of meta-toradex-tegra features a patch which disables the AMS AS3722 PMIC's auto power on when AC OK feature otherwise enabled by default and causing a reboot rather than full poweroff.

Description: In a SDK the symlink sysroots/armv7at2hf-neon-angstrom-linux-gnueabi/usr/lib/arm-linux-gnueabihf/tegra/libGL.so currently points to ./arm-linux-gnueabihf/tegra/libGL.so.1 which does not exist.

Workaround: Fix the symlink in the unpacked SDK: ln -fs libGL.so.1 .../sysroots/armv7at2hf-neon-angstrom-linux-gnueabi/usr/lib/arm-linux-gnueabihf/tegra/libGL.so

Description: SD card is not detected in U-Boot even after using "mmc rescan".

Workaround: Fix already available in 2016.11-toradex-next U-Boot branch.

Description: OpenCV4Tegra currently fails to build due to a missing dependency on libpng12.

Workaround: The libpng12 recipe has been re-added to the rocko-next branch of meta-toradex-tegra so OpenCV4Tegra is at least buildable again. However, for full OpenCV4Tegra support, we recommend using NVIDIA's JetPack resp. Linux for Tegra aka L4T as explained in the following article on our developer website:
https://developer.toradex.com/knowledge-base/installing-nvidia-jetpack-with-l4t-on-apalis-tk1

Description: Building 2.8b2 and earlier fails on Ubuntu 18.04 LTS.

Workaround: It works on Ubuntu 16.04 LTS.

Description: While BSP 2.8b1 enumerated PCIe on the Apalis evaluation board just fine BSP 2.8b2 may fail with the following error message:
busn_res: can not insert [bus 02-01] under [bus 01] (conflicts with (null) [bus 01])

Workaround: As a workaround you may just revert the following offending commit for now:
http://git.toradex.com/cgit/linux-toradex.git/commit/?h=toradex_4.9-1.0.x-imx&id=9a4bf05126f42c2632729ab0da503021d74ed454

Description: RS485 with using RTS to control the transceiver is not working. The RTS signal is not asserted during transmission. This is a regression in 2.8 BSPs (Linux kernel 4.9).

Workaround: Use ioctl to configure RS-485 and set the flag SER_RS485_RX_DURING_TX and SER_RS485_RTS_AFTER_SEND.

Description: When the UART without DMA (fsl_lpuart.nodma=1) overruns, the FIFO can get out of sync. Once out of sync, characters appear delayed only after new characters have been received.

Workaround: Reopen UART in case overruns have been detected (see /proc/tty/driver/fsl-lpuart). Use UART in DMA mode makes overruns less likely to occur and seems not to suffer issues on overruns.

Description: When migrating to the Linux kernel only the evaluation board device trees got updated, others may have diverged. This is especially the case with the Colibri camera device tree concerning e.g. RTC and new capacitive touch aka mxt.

Description: Currently the Toradex configuration block parser suffers an off by one issue potentially leading to spurious printout during boot e.g.
Model: Toradex V1.2A,
instead of
Model: Toradex UNKNOWN MODULE V1.2A.

Workaround: Fix available on 2016.11-toradex-next branch of git.toradex.com/u-boot-toradex.git.

Description: OE-Core layer did backport more package splits in the linux-firmware recipe. Due to this the HEAD of the morty branch clashes now with a similar split we did in meta-toradex-bsp-common resulting in a fatal QA error. (Compare with commit 0eaef98) ERROR: linux-firmware-1_0.0+gitAUTOINC+bf04291309-r0 do_package: QA Issue: linux-firmware-sd8887 is listed in PACKAGES multiple times, this leads to packaging errors. [packages-list]

Workaround: Delete the lines PACKAGES_prepend = "\ ${PN}-sd8887 \ " from meta-toradex-bsp-common/recipes-kernel/linux-firmware/linux-firmware_%.bbappend

Description: Adding perf to all eMMC-based Images which are less space-constrained than raw NAND ones.

Workaround: You may build a custom image including perf according to your requirements.

Description: PCIe enumeration aka "pci enum" U-Boot command may fail in U-Boot due to some I2C/Power management issue.

Description: Add support for RS485

Description: SPDIF is not working in the V2.6 beta 2 release. This is a regression against older releases.

Workaround: Fixes found in the -next branches of our 3.14, 4.1 and 4.9 based Linux kernels.

Description: The new Apalis iMX6 Mezzanine board allows access to the MIPI-CSI2 interface. The current device tree has different GPIO assignments for the camera reset and power pins. Change the pin assignment to use Apalis GPIO1 for reset and Apalis GPIO2 for power down.

Description: Forward-port the change to allow configuring the display timings via kernel command line to the Linux kernel 4.9.

Workaround: -

Description: The USBC port does only work in device mode. Switching to host does not work. This is a regression introduced with the move to the 4.9 kernel version.

Workaround: Cherry-pick the following commit: 'ARM: dts: imx6ull-colibri: Specify cable detect as ID and VBUS pin' and recompile and deploy the device tree.

Description: The internal aka on-module RTC is not available since we migrated to the Linux 4.9 kernel (2.8b1).

Description: The system freezes during boot shortly after initializing the MCP2515 CAN controller. The CAN controller triggers a (re)probe of the thermal driver which fails to probe during boot. This late probe causes the driver to access OTOCP registers which are not clocked anymore.

Workaround: Add clk_ignore_unused to defargs in the U-Boot command line (e.g. by using "setenv defargs ${defargs} clk_ignore_unused").

Description: During boot-up of Colibri iMX7 Dual 1GB (with eMMC flash) sometimes the system freezes right after "Starting File System Check on Root Device".

Description: Remove snapd from standard images.

Description: Currently this is hard-coded in some board resp. panel platform files making it rather difficult to test various options around eDP/LVDS. NVIDIA's implementation has partial support for device tree which needs extending and testing.

Description: Provide Toradex GPIO tool.

Description: Pads not used in U-Boot are accessible via GPIO command. However, SODIMM 169 is currently not available and is driven high at the moment in U-Boot.

Description: Currently, we use an init script which starts X directly and then a Qt demo application. This has some drawbacks, e.g. when one wants to start a touch calibration or the likes. Use some readily available X startup system, e.g. xinit as a better base customers can build upon.

Workaround: Please find a suitable systemd service in the following recipe:
http://git.toradex.com/cgit/meta-toradex-demos.git/tree/recipes-images/images/angstrom-qt5-x11-image.bb?h=rocko#n4

Description: Unfortunately, the older Linux kernel 3.14.52 as used in V2.6 does disable the SD card power rail VGEN3 upon boot which is reported as follows:
VGEN3: disabling
Subsequent SD card operation fails as follows:
mmcblk1: error -110 sending status command, aborting

Workaround: Please find an updated device tree as per the following commit:
http://git.toradex.com/cgit/linux-toradex.git/commit/?h=toradex_imx_3.14.52_1.1.0_ga&id=7659fe414d37861050ec909bb2d27c4bfca87d27

Description: Upstream libusbgx accepted our implementation of OS Descriptor support. However, during review process the configuration schema changed slightly. Update libusbgx to the latest upstream version and use the new configuration format.

Description: The early sample hardware Apalis iMX6 V1.0A/B have a different UART pin-out which require a specific device tree. Starting with 2.8 Beta 1 we no longer provide these device trees.

Workaround: Use an older BSP or forward port the relevant changes between the device tree targeting the later HW vs. V1.0 HW.

Description: Enable "user debug" which enables kernel messages when a user process crashes due to an exception.

Description: Use ISO 8601 date format in the release_date property of the Toradex Easy Installer image JSON descriptor file.

Description: We are currently using 4.11 which is not really an LTS release however we opted to do that because we were relying on it for certain later features for certain Wi-Fi solutions we wanted to support. It may make sense to stabilise on an LTS release for the future.

Workaround: You may find our backports based on Linux kernel 4.14 here: http://git.toradex.com/cgit/backports-toradex.git/log/?h=toradex-4.14

Description: Apalis/Colibri T30 PWM was capped at 12.45kHz. We've increased it to 99.6kHz that can be further divided by integer divider.

Workaround: PWM peripheral input clock value can be increased to a maximum of 48MHz. Valid clock values can be calculated pwm_clk = 408MHz/N, where N=<1 , 128.5> in 0.5 increments

Description: Update our i.MX kernel to the 4.9-1.0.x-imx branch of the FSL community kernel aka linux-fslc-imx which includes NXP's latest 4.9.11 1.0.0 GA release changes.

Description: Update meta-lxde to build the latest LXDE sources. The latest lxpanel release doesn't work with our GTK+3.

Description: Add a -v parameter to fw_printenv/fw_setenv which outputs the U-Boot source version information.

Description: This release is identical to the previous 2.7b4 release and has passed full validation and verification for Apalis T30, Apalis iMX6, Colibri T30, Colibri VF50, Colibri VF61, Colibri iMX6 and Colibri iMX7.

Description: Bring-up Colibri iMX6ULL 512MB WB IT V1.0A.

Description: It would be very convenient to just be able to install NVIDIA's JetPack via Toradex Easy Installer once available for Apalis TK1.

Workaround: For now just stick to the rather cumbersome manual installation procedure: http://developer.toradex.com/knowledge-base/installing-nvidia-jetpack-with-l4t-on-apalis-tk1

Description: As we juggled around some of the pins the GPIO Tool also needs updating.

Description: Add support for on-module Wi-Fi.

Description: Camera support has been greatly improved by an update to the OV5640 driver from our camera partner Antmicro as well as NVIDIA's latest L4T R21.6 update.

Description:
Working on Colibri iMX6ULL 256MB V1.0A, demo image 2.7b4 image:
- U-Boot boot loader
- Environment storage in NAND
- Ethernet
- Framebuffer support
- GPIO from cmdline
- MMC/SD cards
- RAM size auto detection
- Splash Screen
- Toradex Colibri configuration block handling
- UARTA, used for serial console
- USB storage as host on USB host port
- Linux kernel
- Analog input via IIO framework, channel AD0 and AD1
- CAN via MCP2515 on Evaluation Board
- Ethernet
- Ethernet MAC address, optional custom setting from bootloader
- Framebuffer for parallel RGB displays
- Framebuffer console
- GPIOlib /sys/class/gpio
- I2C via /dev/i2c-X
- MMC/SD card mmc0, 4bit wide
- RTC (SoC and I2C)
- Resistive Touch
- SPI
- Splash Screen
- UARTA, used for serial console
- UARTB, UARTC
- Serial number and board revision in /proc/cpuinfo
- SoC unique ID in /sys/bus/soc/devices/soc0/unique_id
- Suspend LP1
- USBH host port
- USB host audio driver
- USB device Ethernet RNDIS
- USB device/host detection aka OTG support on USBC
- Watchdog via /dev/watchdog
- Update
- Legacy update scripts
- Toradex Easy Installer

Not working or not tested:
- U-Boot boot loader
- USB device/host switching
- Linux kernel
- Flexcan, not tested
- IrDA, not supported
- PWM, currently not working, SW issues
- RS485, not tested
- USB WiFi, drivers and firmware not installed
- On-Module Bluetooth/WiFi, not yet implemented
- Linux user-space
- GPIOtool, not yet implemented

Description: While the Apalis PWM3 pin is shared with the Apalis BKL1_PWM pin currently the former does not have the PWM pin muxing activated. Note that exporting PWM3 for raw sysfs access will therefore fail and one has to revert to using the pwm backlight.

Workaround: Change resp. pin muxing in the device tree. You may find a patch on our toradex_tk1_l4t_r21.5-next branch.

Description: Target is to achieve >2k msg/s on both CAN channels.

Description: The kernel does not know about rw,noatime. The string rw by itself is valid, and to pass additional arguments rootflags=noatime can be used. The kernel mounts ext3/ext4 file systems by default ro, hence so far the kernel mounted the rootfs read-only. The init manager systemd then remounts the rootfs after file system checking. This makes sense and does not add measurable boot time. Let the kernel explicitly mount ro on block device based rootfs. The root mount flag noatime is only relevant when re-mounting read-write, hence it needs to be present in /etc/fstab. UBIFS used on raw NAND devices has no user space file checking, hence there is no value to mount it in read-only first. Also mount time for UBIFS is larger, and mounting first read-only and then read-write has higher boot time (300ms, likely due to missing block cache). Let the kernel explicitly mount rw on raw NAND based rootfs. UBIFS has no atime support, hence no root mount flags needed.

Workaround: The change to initially read-only mounted root file system on Apalis TK1 requires the U-Boot emmcargs environment variable to be adjusted to run NVIDIA's JetPack resp. L4T as documented here: http://developer.toradex.com/knowledge-base/installing-nvidia-jetpack-with-l4t-on-apalis-tk1#Flashing_Latest_Boot_Loader

Description: If an image creates a rootfs which is exactly a multiple of 64 MByte and then if one executes in U-Boot 'run update' the detection that all 64 MByte chunks have been flashed fails and the update never completes. Note that the Toradex Easy Installer is not affected.

Workaround: Check the last rootfs chunk on the update media and create a zero length chunk with incremented number, e.g.: $ ls -l //colibri-imx6/ ... -rw-r--r--. 1 root root 67108864 Jul 12 15:13 root.ext3-106 -rw-r--r--. 1 root root 67108864 Jul 12 15:13 root.ext3-107 -rw-r--r--. 1 root root 48128 Jul 12 15:13 SPL ... $ touch //colibri-imx6/root.ext3-108

Description: We forgot to actually deploy the new device tree: imx6q-apalis-ixora-v1.1.dtb.

Workaround: Just checkout the Linux kernel sources, build the device trees and copy imx6q-apalis-ixora-v1.1.dtb to the update SD card into the apalis_imx6 folder. Then in U-Boot first 'setenv fdt_file imx6q-apalis-ixora-v1.1.dtb; saveenv' and do a 'run setudpate; run update_fdt'.

Description: Power I2C bus communication speed should be reduced to 100 KHz as our temperature sensor chip LM95245 is not rated for higher speeds.

Description: When migrating from older stable Colibri VF61 BSPs to later BSPs the MCC functionality got replaced by rpmsg. In order to be able to continue running existing eCos or MQX implementations on the M4 core the MCC functionality would be needed. A fix is pushed to the mcc kernel module: https://github.com/toradex/mcc-kmod/commit/083388fa5cce79c239988d61543322d91996aa8d

Description: Use the ext4 file system by default.

Workaround: Please note that if one is updating from an earlier release one may have to manually fix the U-Boot environment to take this into account as mentioned on the community forum at https://www.toradex.com/community/questions/16464/image-27b4-fails-to-mount-rootfs.html

Description: Currently various things may fail or behave strangely on certain modules if the config block is missing. Unify that behaviour by e.g. rather not allowing use of any features (e.g. Ethernet, RNDIS) at all in this case.

Workaround: Use the 'cfgblock create' U-Boot command to restore the config block. Alternatively we implemented similar functionality into our Toradex Easy Installer.

Description: After the RTC has been under-powered, some RTC deliver invalid date/time. The external RTC currently shipped on Toradex evaluation boards has a oscillator fail bit which indicates when RTC does not contain a valid date/time.

Description: Add support for Capacitive Touch Display 7" Parallel V1.0A.

Description: Use optimized RAM timings as we found some issues on some modules and in our temperature testing.

Description: The SGTL5000 driver in the Linux Kernel currently only supports one codec. The driver would need amending so that multiple codecs can be used. The issue is the statically created VDDD_LDO regulator.

Workaround: For i.MX based modules update to BSP 2.7b3 or later. With the backport of 'ASoC: sgtl5000: Fix regulator support' into the toradex_4.1-2.0.x-imx this driver limitation has been removed.

Description: USB Gadget schema fails to load on Apalis iMX6 Quad 2GB IT and Apalis iMX6 Dual 512MB modules which leads to RNDIS not working.

Description: There is now an experimental meta-snappy which allows regular Yocto project BSPs to support running Ubuntu Core snaps. Integrate this in our regular demo images.

Description: After the RTC has been under-powered, some RTC deliver invalid date/time. The external RTC currently shipped on Toradex evaluation boards has a oscillator fail bit which indicates when RTC does not contain a valid date/time.

Description: Trying to sdboot from an ext4 rootfs fails due to us defaulting to ext3. While the downstream T20/T30 L4T kernel has issues with ext4 later TK1 L4T should work just fine with it.

Workaround: Just change the sdargs to ext4 as follows: setenv sdargs 'ip=off root=/dev/mmcblk1p2 rw rootfstype=ext4 rootwait'

Description: Wakeup on CAN does not work in suspend mode with FlexCAN with 4.1.39 kernel.

Description: Depending on its DVFS state right before hardware reset the Apalis/Colibri T30 module may hang during a subsequent boot. Software reset seems not affected.

Workaround: Either power-cycle or make sure you are running at a higher DVFS state upon hardware reset. A fix for this called 'apalis/colibri_t30: improve vdd core pmic handling' may be found on our U-Boot 2016.11-toradex-next branch.

Description: As on our T30 designs there is a hardware over-temperature shut-off directly via PMIC we should check whether we could at least have an over temperature message shortly before that (e.g. 5 deg C).

Description: Fix the Colibri iMX7 display timings and allow setting them from the kernel cmdline.

Workaround: Use native mode node in device-tree

Description: Apalis iMX6: The gpio-tool can not read or change the current pinmuxing of the NANDF_DATA4 pin but rather the SD4_DAT6 pin got changed instead. Apalis TK1: Some of the Apalis GPIOs were not accessible with the gpio-tool.

Workaround: Don't use the gpio-tool for pin NANDF_DATA4 on Apalis iMX6.

Description: Since the move to the toradex_4.1-2.0.x-imx kernel poweroff fails powering off the PMIC once Linux reached halt.

Workaround: One could poweroff the carrier board by using a GPIO. http://developer.toradex.com/knowledge-base/gpio-(linux)#GPIO_PowerOff

Description: A few Colibri VF50/VF61 (IT) modules flashed with our latest beta BSP release V2.7Beta1_20170112 may hang during DRAM initialization (e.g. right after printing DRAM:). Attempting recovery with that same beta release will likewise fail.

Workaround: This is a software regression in U-Boot. Either compile U-Boot from our -next branch or use our latest stable BSP release V2.5_20151216 which has been fully validated & verified and does not exhibit this issue.

Description: The mmc-utils allow e.g. inspecting the current health and life time estimation of the on-module eMMC.

Description: The wrap-up script in the Toradex Easy Installer Colibri iMX6 V2.7 Beta 1 image does not allow to flash Colibri iMX6 modules.

Description: In the U-Boot version 2016.11 as shipped with our BSP V2.7 beta 1 the USB host mode initialisation (usb start) returns "Port not available." on both ports. This issue has been fixed and is available on our -next branch.

Description: After the RTC has been under-powered, some RTC deliver invalid date/time. The external RTC currently shipped on Toradex evaluation boards has a oscillator fail bit which indicates when RTC does not contain a valid date/time.

Description: On modules with newer kernels we set up a composite USB gadget with an RNDIS and a ACM USB endpoint providing a virtual Ethernet and serial link on the USB client port. Currently for Colibri VF a getty is spawned on the serial link giving you a login console on that connection. All other modules do not spawn a getty. We no longer spawn a getty on any module since some host platforms do have issues with composite USB gadgets.

Workaround: Please have a look at the following article on our developer website for more information: http://developer.toradex.com/knowledge-base/usb-device-mode-(linux)

Description: On Colibri VF50/VF61 in situations with frequent unexpected power-cuts there is a possibility of filesystem getting corrupted.

Workaround: Use a Read-Only Root Filesystem.

Description: Using PREEMPT_RT patch with Linux 4.4.21 on Colibri VF61 results in a freeze at boot time.

Workaround: Disable serial console either via kernel boot arguments or kernel configuration (CONFIG_SERIAL_FSL_LPUART_CONSOLE).

Description: The elf file format is supported by most commercial and free development environments and provides a standardized header for crucial information such as load address and entry point.

Description: Testing various SDIO based Wi-Fi solutions we observed it to completely lock-up the system.

Workaround: Find the following commit fixing this: http://git.toradex.com/cgit/linux-toradex.git/commit/?h=toradex_tk1_l4t_r21.5&id=20e255fde2d32d8bccd9e589fad4a2f663fcfb3a

Description: Test low-power/suspend modes.

Description: At this point the Linux suspend to memory and standby power states are supported ("mem"/"standby"). The standby mode uses a low power run state, whereas suspend to memory makes use uses the SoCs deep sleep mode (DSM). Wakeup from external GPIO as well as internal RTC have been verified working.

Description: With the move to morty all SysV initscripts have been installed which caused interference. This got fixed by finally getting rid of all SysV remnants.

Description: Using keypad driver causes kernel freeze on iMX7

Workaround: Use the generic GPIO driven matrix keyboard driver

Description: Include linuxptp in BSP image

Description: Prepare mainline kernel based machine with noueveau and wayland for Apalis TK1.

Description: The gpio-tool will allow to override pin muxing functionality and test GPIO input/output functionality.

Description: The gpio-tool will allow to override pin muxing functionality and test GPIO input/output functionality at runtime.

Description: Our current PEX 8605 errata workaround violates the PCIe clock and reset specification should no PCIe switch be present as e.g. the case on Ixora.

Description: Our current update procedure reads the rootfs payload in pre split files of 64 MB size. The number of chunks is limited to 89 resulting in a maximum size of 5.5 GB.

Workaround: - use the ums command in U-Boot to export the modules eMMC as a mass storage device. - deploy a minimum rootfs and install the 'big' payload after booting into Linux

Description: Updates our downstream U-Boot to latest mainline, likely 2016.11.

Description: The Colibri iMX7 SODIMM 45 wake-up configures an internal pull-up while other modules use pull-down. Also some carrier boards use a external pull-down resistor. Configure an internal pull-down resistor on the pin do be consistent with carrier boards and other modules.

Description: Currently our update.sh script limits the partition size to around 8GB by default so even after our automatic resizing only 8GB of the 16GB of available eMMC space can be used.

Workaround: Manually modify the EMMC_SIZE calculation for apalis-tk1 in our update.sh script. Our upcoming Toradex Easy Installer will no longer suffer from this limitation.

Description: Closing the touch device while the touchscreen locks the closing task and leads to a task blocked kernel message.

Description: Add support to use signals from the K20 companion MCU connected to the MXM connector as GPIOs. Basic support will be non-interrupt safe (may sleep) and the latency will be similar to regular SPI GPIO expanders.

Description: When using UART with DMA it can lock up the UART sending path. The serial console might lock up completely.

Workaround: Disable DMA for UART.

Description: Documented here: http://developer.toradex.com/knowledge-base/using-k20-companion-mcu-on-apalis-tk1#Erase_Chip_Without_Reprogramming

Description: Newer distros like e.g. Fedora 24 use GCC version 6 as the host (native) toolchain. Our jethro based Yocto project build is not able to build the needed native tools, among them the cross compiler on such distros.

Workaround: Use a lightweight container with an older distro as documented on our developer website.

Description: Further U-Boot distro boot integration would allow booting off regular ARM distro's SD cards or USB mass storage devices aka memory sticks.

Description: Udisks development has stalled in 2014, udisks2 seems to be the successor. According to the OE recipes udisks2 also has less dependencies (notable lvm2, which adds almost 3.2MiB to the image and is not commonly used in embedded systems as well as sg3-utils, another 1.1MiB). Udisks2 also has a command line utility see: https://zeth.net/2014/05/28/modern_mounting_with_udisks2.html.

Description: So far U-Boot writes a BCB (Boot Configuration Block) crafted in a way to work around errata e9609. This also requires the U-Boot to be written in a way which only uses 3/4 of a page (implemented by the writeboot command). This mode has a drawback in practice: It cannot detect bad blocks marked with the usual bad block marker. Colibri iMX7 V1.1B and later do not suffer errata e9609. In order to overcome the limitations of the work-around, new U-Boot version will write the BCB in a new format which allows detecting bad block markers and use complete pages. This also allows to write the boot loader using standard nand write commands.

Description: As that whole source mirror stuff has been introduced rather haphazardly whoever did that also failed maintaining/updating it since V2.5 e.g. http://sources.toradex.com/V2.5/. The wohle process around this is currently unclear.

Workaround: http://git.toradex.com/cgit/meta-toradex-demos.git/commit/?h=jethro&id=a6c6fa422e9cf9586e0eb8aba40e0460513edf58

Description: Support Apalis UART4.

Workaround: Use UART1, UART2 or UART3 for now. Alternatively the mainline Linux kernel already supports all 4 UARTs.

Description: VisionWorks demo achieves 10FPS on Apalis TK1 & 30FPS on Jetson TK1. Please identify the cause and resolve it.

Workaround: Fixed by a combination of Norrin soctherm and Laguna cl-dvfs just like used on Jetson TK1: http://git.toradex.com/cgit/linux-toradex.git/commit/?h=toradex_tk1_l4t_r21.5&id=3c204d1590b9fcead7169c7f066f6918bcbde55f

Description: Bring-up type specific CSI-2 camera interfaces.

Workaround: http://git.toradex.com/cgit/linux-toradex.git/commit/?h=toradex_tk1_l4t_r21.5&id=4311e45350ad9199a62e5f37b211cee7de4dfb19

Description: Changing the default settings of multiplexed pins of the camera input allows saving up to 100mW of power.

Description: Using Colibri iMX7S freezes when using Viola. Could be a boot rom issue.

Workaround: Disable SNVS RTC in the device tree.

Description: When booting the M4 core using U-Boot (m4boot) rpmsg seems not to work (the kernel module loads but the initial test message does not seem to arrive/be recognized at the FreeRTOS side).

Workaround: Use the remoteproc method to boot the M4 core.

Description: BL_ON GPIO control is currently missing.

Description: Even if a USB controller is in peripheral mode, loading the USB Gadget schema fails with "Failed to start Load default USB gadget schema g1.schema.".

Workaround: Remove the command (ExecStartPost) copying the serial-number to the USB Gadget configuration in /etc/systemd/system/multi-user.target.wants/usbg.service.

Description: Our latest kernel is missing RS485 handling e.g. to use the RTS (CTS) output to control a RS485 transmitter.

Workaround: You may find the following commit from our older Linux kernel 3.10.17 as deployed in our embedded Linux BSP V2.4 Beta 1 (May 18, 2015) useful: http://git.toradex.com/cgit/linux-toradex.git/commit?h=toradex_imx_3.10.17_1.0.0_ga&id=82cf64948ddab0360fab876ee321b6191ed7258a

Description: Automatic USB Device/Host Detection will allow to use the USB port as either Device or Host (OTG). Note: The current default on the USB client port (USBC, OTG) is to be USB host. The reason for this default is that the Colibri iMX7S modules only provide this USB port, and USB host is typically used more often than client.

Workaround: If USB device is preferred as default set the device tree "dr_mode" property of the "usbotg1" node to "peripheral".

Description: As OE moves to GCC-6 we should provide our U-Boot and Kernel sources in a way that they can be built with gcc 6. This would allow customers taking our BSP and using it with a later Yocto project release.

Description: A bug in our GPIO Config Tool prevents the Apalis iMX6Q MXM Pin 130 to be accessible.

Description: The use of fdt_fixup should be unified across all our modules and document.

Description: All pins without a specific function should be configured for regular GPIO support.

Description: Separate the 'one size fits all' meta-toradex layer into BSP layers by SoC vendor and a software layer for the demo images.

Description: This release is identical to the previous V2.6 Beta 2 release and has passed full validation and verification for Apalis T30, Apalis iMX6, Colibri T30 and Colibri iMX6.

Description: Upgrade the Linux kernel and U-Boot to NXP's latest official i.MX 7 L4.1.0_1.1.0_GA BSP.

Description: On the BSB V2.6 Beta1 an OV5640 MIPI Camera does no longer work out of the box. This is caused by a driver having its compatible string changed.

Workaround: Correct the compatible string in the device tree.

Description: On the Colibri iMX6DL the RAM configuration is not patched correctly causing only 256MB aka half of the RAM being available.

Workaround: A fix is already available on the 2015.04-toradex-next U-Boot branch.

Description: The Colibri iMX7 Solo does only have one USB port. However the bootloader code of the Alpha1 release touches registers of the not available second USB port which leads to a freeze of U-Boot.

Workaround: None.

Description: Support the Multi-Touch Controller used on the Toradex Capacitve Multi-Touch Displays.

Description: Support Vybrid's internal 10/100MBit hardware L2 Ethernet switch.

Workaround: Use Linux Ethernet bridging support.

Description: Audio settings do not get restored after suspend-to-RAM (LPSTOP2).

Workaround: Use standby (STOP) mode instead for now.

Description: UART Mark parity bit mode always generates a space parity bit (a 0 instead of a 1).

Description: When triggering the DCD signal an interrupt is generated which is not handled by the UART driver.

Description: While on the Apalis Evaluation board the PCIe switch as well as plugged-in (mini-)PCIe cards usually get detected actual operation may fail.
On Ixora PCIe may fail due to a device reset/initialisation timing issue.

Description: UART receiver path can overflow in certain conditions when using DMA mode. This leads to the receive path being stuck and not receiving any character anymore.

Workaround: Disable DMA mode by overwriting the dma-names property in the device tree.

Description: Alpha release for FCS.

Description: When rebooting the system using software reboot Linux can leave the PHY in an undefined state (e.g. down) in which case Ethernet may not work in U-Boot unless a hardware reset is performed.

Description: Add support for the LM Technologies LM006 Wi-Fi USB dongle to our standard images.

Description: Driver support for non standard UART baud rates.

Description: USB detection may fail especially on the OTG port plus the transfer speed may be rather low.

Workaround: Reverting http://git.toradex.com/cgit/linux-toradex.git/commit/?h=tegra&id=629b91fa046df5213ed3312d2e2b8683e6bdd70c helps but reintroduces issue #6422.

Description: Very rare occurrence of eMMC issues as shown below in combination with extensively heavy SATA and/or SD card stress testing: I/O error, dev mmcblk0

Workaround: Avoid extensively heavy SATA and/or SD card stress testing. Usually power-cycling brings the system back to life.

Description: Libc based memory copy recently slowed down by almost a factor of two.

Workaround: Use one of our V2.1 based BSPs which did not exhibit this issue.

Description: The PMIC RTC does not meet the expected accuracy.

Workaround: If possible use the external RTC provided by the carrier board.

Description: -

Description: No framebuffer support in U-Boot for Colibri/Apalis T30, therefore splashscreen in U-Boot is not possible.

Workaround: Use splashscreen support in Linux.

Description: Tear-free double buffering using the Linux framebuffer is currently not possible since there is no method to synchronize the buffer swap with the vertical synchronization period.

Description: Support using RS-485 transmitter on UART interfaces using the UART_x_RTS signal as DE (driver enable).

Description: The U-Boot boot loader does not switch on the power on the USB host port. This makes the USB host port not working by default on the Viola and Iris Carrier Boards.

Workaround: Use U-Boot's GPIO functionality to switch on the USB host power (GPIO 83).

Description: Increase ECC level from 6 errors to 8 errors per 512 bytes page to reach typical endurance of 100K cycles.

Description: One might get the following floating point exception when using nv_omx_h264enc either trying to transcode MPEG transport streams or encode video stream coming from a Gstreamer appsrc: +NvxVideoEncoderSetNvMMAttributes-NvxVideoEncoderSetNvMMAttributesFloating point exception

Workaround: If you experience this exact issue please downgrade to our V2.3 Beta 3 (October 31, 2014) release for now. We opened a ticket with NVIDIA and are working with them to get this resolved as soon as possible.

Description: Rare occurrence of eMMC issues as shown below can lead to read-only root file system or even non-booting systems: I/O error, dev mmcblk0

Workaround: Usually power-cycling brings the system back to life. The tegra-next branch of our Linux kernel source repository contains a fix for this.

Description: Publishing our machine support into the community driven meta-fsl layer.

Description: Mountpoint names are different when mounted at boot vs. mounted at runtime / with diskutility.

Workaround: None.

Description: Sometimes the kernel freezes right on startup. The last message being shown in the serial console is "Starting kernel ...".

Description: SPI by using Vybrid's DSPI peripheral does not work as intended.

Description: Currently there are kernel errors after suspend to RAM when using AC97.

Description: Support Apalis iMX6Q 2GB IT in our BSP.

Description: XRandR based rotation as described on the following article on our developer website is broken since our V2.1 releases: http://developer.toradex.com/knowledge-base/x-server-%28linux%29#Rotation

Workaround: Please revert to one of our older V2.0 based releases for now.

Description: Several hours of gstreamer streaming aborts due to memory leak in nvvidconv gstreamer plugin.

Workaround: Under certain circumstances using an older NVIDIA L4T R16.3 based BSP might be feasible until NVIDIA releases a fix.

Description: -

Description: UBI needs about 10 seconds to attach on a current Colibri VF61 with 1GB NAND flash. While this will decrease a little with our switch to just 512MB NAND use of fastmap is desired but requires a later kernel.

Description: Certain low-speed USB devices are not detected correctly when plugged into a running system.

Workaround: Use a hub or ensure device is connected before power up. A driver fix will be made to correct this behaviour.

Description: Support analog inputs from STMPE811 via IIO framework.

Workaround: Use V2.2 beta 1 based on older Linux kernel 3.0.35 for now.

Description: Analogue audio codec disappearing during reboot particularly if previously used for audio recording.

Workaround: Power-cycling should help. Alternatively wait for us to backport respective Linux kernel driver fixes.

Description: The Vybrid internal RTC would allow waking up the system from low power modes based on a time (wakealarm).

Description: PCIe is rarely unavailable after Boot on the Apalis T30 module indicated by the following kernel message(s) during boot: 'PCIE: port 0: link down, ignoring', 'PCIE: port 1: link down, ignoring' and/or 'PCIE: port 2: link down, ignoring'. Gigabit Ethernet is also affected by this issue as its controller chip is connected through PCIe indicated by the following missing kernel message during boot: 'igb 0000:01:00.0: Intel(R) Gigabit Ethernet Network Connection' resp. 'igb 0000:07:00.0: Intel(R) Gigabit Ethernet Network Connection'. We are working together with NVIDIA to solve this issue as it seems to be a hardware issue of the PCIe controller in the T30 SoC.

Workaround: Currently the only thing known to help is power-cycling or sometimes also doing a reset. As the issue is probably dependant on operating conditions such as temperature varying this might also help. We are working together with NVIDIA to find a good software workaround for this issue.

Description: Rare I/O error observed on eMMC which might prevent successful boot.

Workaround: Power-cycle usually helps. Alternatively use a later custom kernel or await our official release thereof.

Description: Multi-touch integration pending.

Workaround: Port multi-touch integration from Tegra resp. Vybrid BSPs.

Description: imx_3.10.17_1.0.0_ga

Description: Currently if doing SD boot the U-Boot environment is not preserved on the SD card.

Workaround: Build latest U-Boot sources from git.toradex.com.

Description: Support Vybrid SoC internal CAN controllers.

Description: Add Apalis MXM pin descriptions to the GPIO config tool.

Workaround: None.

Description: Implement initial CSI-2 support for the Aptina AS0260 YUV sensor.

Description: Base on later U-Boot version in order to support Device Tree for newer Kernel version.

Description: Some pins used for AC97 (VF61) resp. ADC (VF50) resistive touch changed. ADC resistive touch driver requires adapting to work with both previous V1.0A as well as new V1.1A Colibri VF50 modules.

Description: From time to time boot-up hangs just after RTC detection (or nearby). Usually boot-up can be unfrozen by sending a character.

Workaround: This issue is related to UART. If the UART is not connected, the issue doesn't appear.

Description: Send Ethernet PHY to powersave when going into sleep modes.

Description: Toradex fixed pop issues in SGTL5000 Audio Codec.

Description: -

Description: Migrate U-Boot mainline to using driver model for video.

Description: KSZ9031 is not IEEE compliant and will be replaced with KSZ9131 that passed compliance testing

Description: Timeouts and reads from false channels may be observed when using STMPE811 ADC.

Workaround: An improved driver is available on the toradex_4.9-2.3.x-imx-next branch applicable for Apalis iMX6, Apalis iMX8, Colibri iMX6 and Colibri iMX8X.

Description: Qt 4 was first released in 2005 and has been unsupported since 2015. For our 3.0 (thud based) release we remove meta-qt4 from the installed layers and remove related image recipes.

Workaround: Forward port applications to use Qt 5.

Description: Switching multiple times back and forth between USB device/host mode sometimes may freeze the module.

Description: For single antenna set single_rf=0x01

Description: USB OTG configured for USB 3.0 operation may get stuck in host mode on Apalis TK1.

Workaround: If you need full OTG functionality do use USB 2.0 mode only which is now the default as of BSP 2.8b6.

Description: If flexcan and external CAN (mcp251x) are enabled at the same time, it could be that randomly flexcan or mcp251x is assigned as can0. This could lead to application errors since the communication is done at wrong CAN Pins.

Workaround: If there is no need of mcp251x Can Interface, then disable it.

Description: On modules with a SoC having an additional M4 core one might want to deploy firmware through our regular image build process. Add a hook to simplify that deploy process. Do this for our legacy update procedure and for the Toradex Easy Installer.

Description: On 32-bit systems, Linux uses a 32-bit signed integer type 'time_t' to represent time at various locations. It gives the time as seconds relative to 1970. The time_t type wraps at "2038-01-19 03:14:07", so all users of time_t likely fail when a type_t instance is set to a timer after that date. This issue is applicable to all 32-bit systems and will be fixed in mainline eventually.

Description: Colibri iMX6ULL 512MB WB IT V1.0A sometimes fails to read UBIFS when temperature is below 0°C.

Description: The Linux kernel leaks memory during open/close of the serial interface (ttyLPx) from user space.

Workaround: Avoid close/open of the UART.

Description: On Colibri VF50/VF61 in situations with frequent unexpected power-cuts, there is a possibility of filesystem getting corrupted. The issue is related to extended filesystem attributes (xattrs).

Description: We optimised the RAM setting for Colibri VF50/VF61 and fully validated & verified various modules in our temperature chambers.

Description: The Wi-Fi/Bluetooth activity LEDs are not working on Colibri iMX6ULL. Custom firmware running on the Wi-Fi chip would be needed.

Workaround: Just use regular GPIO LED via network triggers.

Description: In BSP 2.7 an Apalis iMX6 IT module may hang during boot after a watchdog restart.

Workaround: Use stable BSP 2.8.

Description: Video playback with nvgstplayer is not working when booted with a plugged-in USB webcam.

Workaround: Plugging-in the webcam after the system booted up may alleviate the issue.

Description: Apalis iMX6 is not reading the full content of EDID but rather only parts of it. Exact behaviour also depends on the U-Boot environment variable vidargs.

Description: When the kernel boots the display shows a boot logo (by default Tux) along with kernel messages.
If one uses the HDMI output that logo is not shown due to the initialization sequence the IPU driver goes through.

Workaround: See: http://www.toradex.com/community/answers/34554/view.html

Description: While the CAN transceiver regulator is properly powered-down on non-use such functionality during suspend is currently missing in flexcan.c.

Workaround: A custom power-down GPIO may be implemented.

Description: During the legacy update procedure running e.g.:
run setupdate
run update
May show the following spurious errors which can usually be ignored:
MMC read: dev # 0, block # 16383, count 1 ... MMC: block number 0x4000 exceeds max(0x2000)
0 blocks read: ERROR
This has to do with various eMMC parts featuring different eMMC hardware boot area partition sizes which get probed by the legacy U-Boot update scripts potentially showing missleading error messages.

Workaround: Just ignore such error messages during the legacy update procedure.

Description: After a Colibri iMX6ULL is sent to poweroff, modules are booting again when an SD card is inserted/removed which triggers a wake-up.

Description: The T20 SoC internal video DAC output is unsupported by NVIDIA's L4T Linux SW stack our BSP is based on. The T30 SoC does not even support any internal video DAC functionality according to NVIDIA's latest specification.

Workaround: Use an external video DAC on the carrier board similar as to what may be found on our Colibri Evaluation board, Iris or Aster.

Description: Initialization of LM006 not stable on reboots on Apalis iMX6 IT modules.

Description: The LXPanel is showing in a wrong position when opened with certain display resolutions.

Workaround: It is possible to get rid of this bug by choosing different display resolutions using xrandr. It also seems this bug is only appearing when using two displays. Try to only use one display.

Description: DCE Mode for iMX6ULL module not working on Uart5

Workaround: Switch RX and TX and use DTE Mode. or
Don't set the UFCR_DCEDTE mode bit in U-Boot. (board/toradex/'module'/'module'.c

Description: Currently native Compilation is not working in the regular Bsp (version > 2.8) due to a mismatch of GCC libraries.

Workaround: Do cross-compilation or create a custom image with GCC being pre-installed.
IMAGE_INSTALL_append = " packagegroup-sdk-target"

Description: HDMI HDA resp. I2S audio may not work with certain screens depending on available display modes and pixel clock frequencies. HDMI HDA resp. I2S audio may also not work after hot-plugging.

Workaround: Make sure to use vidargs selecting a HDMI audio capable pixel clock frequency. Do not hot-plug resp. power-cycle after plugging in HDMI. If you keep having issues try another brand/model screen.

Description: OpenCV4Tegra currently may fail due to "run-time" dependencies:
cd /usr/lib/; find . -name 'libopencv*so*' -exec ldd {} + | grep 'not found' | sort | uniq
libavcodec.so.54 => not found
libavformat.so.54 => not found
libavutil.so.52 => not found
libcufft.so.6.5 => not found
libjpeg.so.8 => not found
libnppc.so.6.5 => not found
libnppi.so.6.5 => not found
libnpps.so.6.5 => not found
libswscale.so.2 => not found
libtbb.so.2 => not found

Workaround: For full OpenCV4Tegra support, we recommend using NVIDIA's JetPack resp. Linux for Tegra aka L4T as explained in the following article on our developer website:
https://developer.toradex.com/knowledge-base/installing-nvidia-jetpack-with-l4t-on-apalis-tk1

Description: On NAND flash based modules like the Colibri T20, the legacy update procedure depends on first loading the entire root file system image into RAM. If your custom image is significantly larger than our regular demo images it may no longer easily fit into 256MB of RAM, therefore, failing the legacy update procedure (it may just hang or even crash but definitely fails to update the root file system).

Workaround: Doing the following before 'run setupdate; run update' may help to a certain extend:
setenv fdt_addr_r 0x01000000
However, even bigger images may still fail requiring a different flashing strategy altogether (e.g. initially booting from an initrd or via NFS subsequently updating the root file system from within Linux on-the-fly.

Description: If one moves desktop icons in LXDE they are not redrawn automatically.

Workaround: Click anywhere on the desktop and the icons reappear at the position they have been moved to.

Description: The gatttool is deprecated, GATT functionality is available through bluetoothctl.
https://docs.ubuntu.com/core/en/stacks/bluetooth/bluez/docs/reference/gatt-services

Description: After starting the Cortex-M4 firmware from DDR, U-Boot causes a data abort when trying to load Linux.

Workaround: As a workaround you may try
U-Boot: setenv defargs mem=512M; saveenv
freertos-toradex\platform\devices\MCIMX7D\linker\gcc\MCIMX7D_M4_ddr.ld: Change the following line: line 60 m_data -> ORIGIN: 0x8ff80000 LENGTH 0x00070000

Alternatively, start the M4 firmware from OCRAM.

Description: Some user space process may crash on power down or re-boot.

Description: This has initially been observed using JDK 1.8.0_121 on our stable BSP 2.6 but the system still does freeze as of JDK 1.8.0_152 on BSP 2.8b3. There seems to be a race condition within the clocking and/or DMA subsystems caused by Java's rather special way of doing ALSA.

Workaround: Playing MIDI files instead seems to work. Alternatively, using the mainline Linux kernel playing a wavefile using the same Java versions also works just fine.

Description: Add CDC ECM Configuration.

Workaround: Use RNDIS instead.

Description: Currently access point aka ap mode is not supported on the LM816 Wi-Fi USB dongle.

Description: LM816 Wi-Fi speed is limited to 1 Mbit/s rx/tx.

Workaround: Updating to a later Wi-Fi backports may help but only marginally.

Description: Disconnecting MIPI CSI-2 camera may lead to system freeze.

Workaround: Make sure your camera sensor provides a continuous data stream or stop the capturing first and then allow unplugging.

Description: HDA is currently not supported on the digital audio interface DAP1. Therefore the Realtek ALC898 HD audio codec as assembled on the Apalis Evaluation Board won't work.

Workaround: You may use any Linux supported I2S codec like e.g. the SGTL5000 from NXP (formerly Freescale). Please note that custom software adoptions will be required.