Hi Andrei, On Sat, Aug 22, 2026 at 11:15:10AM +0200, Andrei Lalaev wrote: > Hi Hiago, > > Thank you for the patches. > > From your cover letter I understood that SD card is supported. > However whatever I try, I always get the following error: > > U-Boot 2026.07-00002-gbd5e3de2ed6a (Aug 22 2026 - 10:27:48 > +0200)milkv_duo_256m > > DRAM: 256 MiB > Core: 20 devices, 13 uclasses, devicetree: separate > MMC: mmc@4310000: 0 > Loading Environment from nowhere... OK > In: serial@4140000 > Out: serial@4140000 > Err: serial@4140000 > Net: > Warning: ethernet@4070000 (eth0) using random MAC address - > 16:21:8c:10:cd:96 > eth0: ethernet@4070000 > Hit any key to stop autoboot: 0 > milkv_duo_256m# mmc info > Card did not respond to voltage select! : -110 > milkv_duo_256m# mmc rescan > Card did not respond to voltage select! : -110 > > > I tried 2 different SD cards and got the same result. > > Am I doing something wrong, or is there something else I need to configure?
You are most likely missing this patch: https://lore.kernel.org/all/[email protected]/ This is needed in order to make the SD card work. This patch is already merged on main branch, as commit 3a4a8963aace ("mmc: cv1800b_sdhci: honor 'no-1-8-v' DT property"). Check this patch and let me know if it works now ;) > > > Best regards, > Andrei Lalaev Regards, Hiago.
