[SeaBIOS] Failure to detect high-capacity SD card

Kevin O'Connor kevin at koconnor.net
Fri Feb 23 06:24:44 CET 2018

On Thu, Feb 08, 2018 at 10:12:40AM -0500, Chris wrote:
> On Wed, Feb 7, 2018 at 3:14 AM, Paul Menzel <pmenzel at molgen.mpg.de> wrote:
> > Please tell us what SeaBIOS version you use, and attach the debug logs from
> > a working and non-working setup.
> I switched to the SeaBIOS git HEAD code just in case that made a
> difference (it did not).
> The machine has mmc0 as the internal 64GB SSD, mmc1 is the internal
> card reader, then an external USB card reader (64GB) is attached as
> well.

This looks to be very similar to the issue Matt raised back in
October.  It seems the card needs to run at 1.8 volt (instead of 3.3
volt), but it seems to shutdown before telling seabios that.

Can you apply the patch at:


set the seabios debug level to 3, and send the log again?


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