With the standard settings, the Bootloader prints some information over the CoM1 while start up.
Here is an example output:
Toradex Windows CE Bootloader 3.1 for Colibri Built Apr 7 2008 Press [SPACE] to enter Bootloader Menu Launching flash image ... NOR Flash J3: 32 MB, SDRAM: 64 MB Core Voltage: 1450 mV CPU: PXA270 520 (208), SYS: 208, MEM: 208, SDRAM: 104, LCD: 104 WinCE image found. Copying IMAGE(16301964) from FLASH(00080000) to RAM(A0100000)... Jumping to image at 0xA0100000...
It is also possible to deactivate the output.
Type in the Bootloader menu:
X set boot.silent = 1 save boot
TIP: Increase the value “boot.delay” to a value higher than 0. That makes it easier to reach the Bootloader menu with "SPACE".