failed to open device sd card

[vroche85150]

Hi,
I have a problem starting the Mini SS Main Board for CM4 Lite system.
Indeed, the system does not boot on the SD card with the error message "failed to open device sd".
I tried with several cards and several OS but the issue is the same.
The system tries, infinitely, to boot on all entries without success.
I have a pi cm4 lite 2go (no wifi, no emmc).
Can you help me ?
Regards.

[ShigeakiAsai]

Hello
I have same problem too.

I tried to check with some changing environment.
The result is below.

Is it need DTBO or modify config.txt for new version CM4 or bootloader?

Thanks
ASAI, Shigeaki

[martinx72]

Try to downgrade the bootloader of the CM4, it might help.

https://github.com/martinx72/CM4_bootloader_Downgrade

[ShigeakiAsai]

My problem is fixed on the following your update.
https://github.com/martinx72/MiniSS_MB_mod_for_CM5?tab=readme-ov-file#sd-card-is-not-detected-issue-for-reva-only

Note.
Retropie 4.7.1 image is working good.
But, Retropie 4.8 image happened the other problem.
- Linux is start, but GUI is not shown.
I think this is an another problem.
Retropie 4.8 image is also working good.
My previous 4.8 env was something wrong. I'm sorry.

Thank you very much for your update.
ASAI, Shigeaki