[coreboot-gerrit] Change in coreboot[master]: soc/amd/common/block/lpc/spi_dma: Add ability to verify SPI DMA hardware

[Raul Rangel (Code Review)]

Attention is currently required from: Jason Glenesk, Marshall Dawson, Paul Menzel, Rob Barnes, Felix Held.
Raul Rangel has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/56322 )

Change subject: soc/amd/common/block/lpc/spi_dma: Add ability to verify SPI DMA hardware
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Patch Set 7:

(1 comment)

File src/soc/amd/common/block/lpc/spi_dma.c:

https://review.coreboot.org/c/coreboot/+/56322/comment/fcc80c86_d50a4ee8 
PS7, Line 127: 		memset(transaction->destination, 0xFC, transaction->transfer_size);
> 0xFC magic number?

Just a poison value so the `memcmp` fill fail.