> 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? brian
