[U-Boot] Tinker-rk3288 SPL broken with MMC timeout

[Jagan Teki]

I have seen this even on v2019.07 release, and the only release that
it got working with on v2019.01 (SPL, BROM_RETURN)

Any idea? here is the log dump.

U-Boot TPL 2019.10-rc3-00297-g5ba8b12543 (Sep 12 2019 - 08:50:36)
Trying to boot from BOOTROM
Returning to boot ROM...

U-Boot SPL 2019.10-rc3-00297-g5ba8b12543 (Sep 12 2019 - 08:50:36 +0530)
Trying to boot from MMC1
spl: mmc init failed with error: -110
SPL: failed to boot from all boot devices
### ERROR ### Please RESET the board ###

Jagan.