[coreboot-gerrit] Change in coreboot[master]: soc/sifive/fu540: add code for spi and map flash to memory spaces

[Patrick Rudolph (Code Review)]

Patrick Rudolph has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/33055 )

Change subject: soc/sifive/fu540: add code for spi and map flash to memory spaces
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Patch Set 13: Code-Review+2

Memory mapped QSPI mode works fine and allows to boot a payload.
SPI mode needs tests, but as it's 4 times slower and the device is essential a brick right now, SPI can be fixed later if required.