Change in coreboot[master]: util/amdtools: Add script to update the SPI speed in the EFS header

[Martin Roth (Code Review)]

Attention is currently required from: Raul Rangel, Furquan Shaikh, Marshall Dawson, Paul Menzel, Karthik Ramasubramanian, Felix Held.
Hello build bot (Jenkins), Furquan Shaikh, Marshall Dawson, Paul Menzel, Karthik Ramasubramanian, Felix Held,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/56644

to look at the new patch set (#3).

Change subject: util/amdtools: Add script to update the SPI speed in the EFS header
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util/amdtools: Add script to update the SPI speed in the EFS header

The update_efs_spi_speed allows changing the SPI speed manually in a
binary that has already been built.  This will allow binaries not built
for the EM100 SPI ROM emulator to be updated so that they will work.
There is a corresponding change that will check to see if the EFS value
has been modified from the original speed and will prevent coreboot from
updating the SPI speed and mode.

Updated documentation to go along with new script.

BUG=b:177233017
TEST=Update SPI speed in existing binary.  See that SPI speed has
changed.

Signed-off-by: Martin Roth 
Change-Id: I905a9fd8bd93a28aab927dffecbbcf24934b9e03
---
M util/amdtools/README
M util/amdtools/description.md
A util/amdtools/update_efs_spi_speed
3 files changed, 157 insertions(+), 25 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/44/56644/3