Hi Brian, On 10/31/2025 10:02 PM, Sune Brian wrote: >> Your original mail mentions "sometimes fails" and that you tested U-Boot >> v2026.01-rc1+, the most recent change for the nanpi4 family was related >> to sd-card regulator handling to improve reboot when card was using uhs >> speed in os and boot fails in spl due to this. > > I cant 100% conclude all boards and situations so I used "sometimes". > >> Please try my suggestion above, the datasheet for the LDO mention 50us >> start-time and card may need one ms to fully init. Defining this timing >> requirement in the device tree that U-Boot SPL uses should match the >> workaround/fix you mention in your original mail. > > w/o modification do your board experience any sd card error or stall during > boot phase?
My M4B could boot using sd-card without any issue last time I tested. I do not understand the purpose of your original mail when you do not seem to be willing to test suggestions from board maintainers. I will most likely just ignore any more replies from you, sorry. Regards, Jonas > > brian
