New SD/MMC driver fails to read blocks from the SD card

[valpackett]

EFI Shell is displayed instead of bootaa64.efi from the SD card. GPT partitions show up in the EFI Shell.

Replacing the shell with FreeBSD boot1.efi shows "Failed Reading block" errors:

The card is this:

mmcsd0: 16GB <SDHC SL16G 8.0 SN 92C00EE4 MFG 06/2015 by 3 SD> at mmc0 48.0MHz/4bit/65535-block

[imbushuo]

@myfreeweb In https://github.com/imbushuo/NintendoSwitchPkg/blob/da0dd9a0a3db451d422083a42cede3553a0d7bcf/Drivers/SdMmcDxe/EfiBlkDeviceOp.c#L86 Can you try to modify 128 to some smaller value to see if situation improves?

1 will absolutely work, but probably too slow. This value shall be adaptive and I think SDMMC1 auto calibration is necessary to be added later.

[valpackett]

thanks! 32 works

[Owen-sys]

does this fully work on switch?