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Flash Layout i.MX6

 
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IMX6-based Apalis and Colibri modules have different eMMC components with different sizes. The layout is similar and most of the extra space on larger eMMCs is used to store the filesystem, giving more space for customer's own applications and data. eMMCs are organized in blocks of 512bytes, they have two boot partitions and one user partition. We suggest to enable the boot partition, but older releases of the Windows Embedded Compact BSP support also using only the user partition. We have two diffent layouts, depending on whether or not boot partion is enabled.

Layout when boot partition is enabled

This is the suggested configuration. eMMC have two boot partitions, our current implementation uses only one, leaving the second free for user data or other implementations like failsafe bootloader etc.

Partition First sector Size in sectors
(512 Bytes each)
Description
Boot 0 2 MBR (skipped by boot ROM)
Boot 2 136 SPL bootloader, 1st stage bootloader used to load Linux (uboot) or Windows CE (eboot) bootloader
Boot 138 boot partion size - 265 eboot bootloader
Boot boot partion size - 127 126 Config block
Boot boot partion size -1 1 Factory information
User 0 2 MBR and partition table
User 2 32'768 Registry (two copies)
User 32'770 8'192 Splash screen
User 40'962 262'144 Windows CE OS image
User 303'106 all available space filesystem, remember to use preparefs command in bootloader to extend filesystem partition to the full capacity of eMMC

Layout without boot partition enabled and without SPL bootloader

This is the old image layout used in the very early releases of the BSP, it is still supported, but we can't grant support in newer software or hardware releases, so we suggest to migrate to boot-partition layouts before moving to production.

Partition First sector Size in sectors
(512 Bytes each)
Description
User 0 2 MBR and partition table
User 2 128 DCD (configuration commands for boot ROM) and 1st stage bootloader used to load eboot bootloader
User 256 1024 eboot (Windows CE bootloader)
User 1'280 1 factory information
User 1'284 126 Config block
User 1'536 32'768 Registry (two copies)
User 34'304 8'192 Splash screen
User 42'496 262'144 Windows CE OS image
User 304'640 all available space filesystem, remember to use preparefs command in bootloader to extend filesystem partition to the full capacity of eMMC