Unable to boot from microSD card slot on a Lenovo 500e gen 3

Support General Device Support
1

System Details

  • Device: Boten
  • OS: Linux
  • Firmware Type: UEFI Full ROM
  • Firmware Version: MrChromebox-2606.1 (07/14/2026)
  • Internal storage type: eMMC

Summary of the Issue

When trying to boot an OS from a microSD card I get some random errors from the linux kernel. This is not the case when booting it through an USB adapter or on a different chromebook (ASUS Apel). I can also boot an OS normally from the eMMC disk but this gives me limited storage

Steps to Reproduce

  1. Install the ROM software.

  2. Put a microSD card in the computer slot.

  3. Try booting an OS from the microSD card.

Expected Behavior

Linux should boot from the SD card.

2 
ERROR: device ‘UUID=d4558f43-dfbd-4a7d-85a0-3fbd19c033f4' not found. Skipping fsck.

mount: /new_root: can't find UUID=d4558f43-dfbd-4a7d-85a0-3fbd19c033f4.

ERROR: Failed to mount 'UUID=d4558f43-dfbd-4a7d-85a0-3fbd19c033f4' on real root

You are now being dropped into an emergency shell.

sh: can't access tty; job control turned off

The errors I get btw.

3

booting from SD is hit or miss, too many variables. the edk2 SD driver is 1/10th of the size of the Linux one, due to all the device-specific quirks.

1 Like
4

ah alright thanks, so i assume i just can’t do much about this? btw grub loads just fine and the reader also works later on in linux. i also have an issue with side volume buttons but ig it may also just be impossible.

5

if grub loads fine from the SD card, then edk2/firmware isn’t an issue. most likely your initrd doesn’t have SD card support, and so it can’t find the root fs