soc/amd/common/block/lpc: Add custom SPI DMA boot device

This is a copy of mmap_boot.c and mem_rdev_ro_ops. I split it up so it
was easier to review.

The next patches will add support for the SPI DMA controller. This will
provide a minor speed up vs using mmap reads. It will also provide the
facilities to perform asynchronous SPI loading.

BUG=b:179699789
TEST=Boot guybrush to OS

Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: Id26e2a69601d0f31e256d0010008904a447c8e21
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55854
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>

0 files changed, 0 insertions, 0 deletions