rk3588 MNT Reform2 fails to boot from SD card

[Peng Fan]

On Thu, Jan 29, 2026 at 05:46:43PM -0800, Vagrant Cascadian wrote:
>Thanks for adding support for rk3588 MNT Reform2!
>
>I tried using u-boot 2026.01 with the rk3588 MNT Reform2, but it only
>gets as far as SPL, and then fails:
>
>  U-Boot SPL 2026.01 (Jan 01 1970 - 00:00:01 +0000)
>  Trying to boot from MMC1
>  mmc_load_image_raw_sector: mmc block read error
>  Error: -38
>  SPL: Unsupported Boot Device!
>  SPL: failed to boot from all boot devices
>  ### ERROR ### Please RESET the board ###
>
>I *think* MMC1 is eMMC, which I currently have blanked, as recovering
>from a failed install on eMMC is trickier.
>
>The vendor u-boot works fine on either eMMC or SD.
>
>Any suggestions to get it to support booting off SD card?

Please check whether you have this patch in your tree:

commit c4f5b1d4b037beeb538cf6dee0a16cd196539273
Revert "mmc: mmc-uclass: Use max-frequency from device tree with default handling"

This reverts commit aebb523a23818a8ee4199c9532b51e3d4020696f.

Regards
Peng

>
>live well,
>  vagrant