On 2024-12-23 04:00, Chukun Pan wrote: > Hi, >> I've been using the uSD card for a long time as a bootloader only, >> so I don't know what the problem is. >> >> Do you have any information on how to reproduce the problem? >> >> Best regards, > > Not stable on openwrt/lede, sometimes falling to sd-highspeed. > Maybe it would be better to switch to sd-uhs-sdr50 mode. I would advise against using any sd-uhs- mode for sd-card on Rockchip RK356x boards because of a timing issue during boot between mmc, regulator and IO-domain drivers. Any board that support changing between 1v8 or 3v3 io-voltage for the sd-card is possible affected. There is a race condition during boot and when IO-domain driver has not been probed before UHS tuning is started the tuning is done using a 3v3 IO-domain configuration instead of 1v8. This can typically be seen by comparing UHS tuning during boot and when same sd-card is removed and re-inserted after boot. Ideally this race condition should be solved instead of limiting use of UHS modes. However, use of sd-uhs-sdr50 is typically more forgiving and has been used on other boards. Regards, Jonas > > Thanks, > Chukun >
