How does Beagleboard determine if S2 is pressed during boot?

[RobertCNelson]

@CiaranS

My question is: Where in ROM / MLO / uboot / other does the beagleboard store the S2 button value at boot time? I’m assuming this value is stored somewhere in the root partition and needs to be accessed during boot and due to my encrypted root partition it’s failing.

The S2 button is wired to SYS_BOOT2, all this does is change the boot rom’s boot sequence.

@CiaranS

I cleared the first mB of memory on the eMMC to force the board to boot from SD card. This works (I can see the uboot version on the SD card being called in serial logs) however the board doesn’t boot and I get a failure to find /dev/mmcblk1p1 (See attached image)

This means your version of u-boot is not passing the correct boot args. Show a more complete serial boot log of before and after and we can help debug it…

Regards,