The HSPHY firmware must be downloaded to DMA-allowed host address
space. Check for DMA buffer presence and use it as the buffer for HSPHY
firmware to be downloaded from CSME.
TEST=Successfully load HSPHY firmware to CPU on MSI PRO Z690-A DDR4
with DMA protection enabled.
Signed-off-by: Michał Żygowski <michal.zygowski@3mdeb.com>
Change-Id: I88edda26a027b557eeaba80426a5b7be7199507d
Reviewed-on: https://review.coreboot.org/c/coreboot/+/68556
Reviewed-by: Michał Kopeć <michal.kopec@3mdeb.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
a49945e4b7