[DEBUG] rk3399-nanopi-neo4: SPL SD init may report -5 due to SD power-on timing

[Sune Brian]

> 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.

I want to comment a bit on this statement. The datasheet 50us
is not mentioned as loaded or not. If you read more deeply on page 7.
The settling time is already about 40us w/o loaded. With 1uF and no load
settling time is 50us is not quick. So typical 2mA ideal action on SD card,
and changed to 100mA read current could be hard to tell.

Brian