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Geralt reference design has both eMMC and SD card interfaces, so we have
to configure both in ramstage.
Implement msdc.c (mass storage device class) to place the eMMC and SD
card drivers.
This implementation is based on chapter 5.9 in MT8188 Functional
Specification.
TEST=boot to kernel using emmc successfully.
BUG=b:236331724
Signed-off-by: Andy-ld Lu <andy-ld.lu@mediatek.corp-partner.google.com>
Change-Id: I6594c8466a133d3fdb0084716acca8dcf785f94f
Reviewed-on: https://review.coreboot.org/c/coreboot/+/65975
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
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