[coreboot-gerrit] Change in coreboot[master]: arch/x86: Add option to LZ4 compress postcar stage

[Arthur Heymans (Code Review)]

Hello build bot (Jenkins), Patrick Georgi, Martin Roth, Subrata Banik, Julius Werner, Mike Banon, Aaron Durbin,

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

https://review.coreboot.org/c/coreboot/+/36674

to look at the new patch set (#9).

Change subject: arch/x86: Add option to LZ4 compress postcar stage
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arch/x86: Add option to LZ4 compress postcar stage

This adds a Kconfig symbol ROMSTAGE_CACHED_CBMEM to be selected
by flatforms that set up WB caching of where cbmem and stage cache
will be. Based on this the default to compress postcar stage is
selected.

The reason for selecting LZ4 over LZMA is that LZ4 has a very low
stack requirement in comparison with LZMA which is a better idea for
when operating in CAR. Other compression methods might be added later
if platforms have enough stack in CAR for it.

The LZ4 decompressor was already linked in romstage.

Change-Id: I89fdc6066027447bf72968c66e6f5eb5fbb630c7
Signed-off-by: Arthur Heymans 
---
M src/Kconfig
M src/arch/x86/Makefile.inc
M src/cpu/x86/Kconfig
3 files changed, 29 insertions(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/74/36674/9