[coreboot-gerrit] [M] Change in coreboot[main]: Post-build control of serial

[Simon Glass (Code Review)]

Attention is currently required from: Jérémy Compostella, Karthik Ramasubramanian, Paul Menzel, Simon Glass, Stefan Reinauer.

Hello Felix Singer, Jérémy Compostella, Karthik Ramasubramanian, Patrick Georgi, Stefan Reinauer, build bot (Jenkins),

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

https://review.coreboot.org/c/coreboot/+/77712?usp=email

to look at the new patch set (#6).

The following approvals got outdated and were removed:
Verified-1 by build bot (Jenkins)

Change subject: Post-build control of serial
......................................................................

Post-build control of serial

Use the new 'coreboot Control Block' (CCB) to control console output,
including the very first bootblock banner.

Provide a feature in cbfstool to enable and disable the console output.

BUG=none
BRANCH=none
TEST=make (to build coreboot)
$ cbfstool build/coreboot.rom ccb-get -n console
console=loud

First try this to see that the bootblock outputs its banner:

$ qemu-system-i386 -bios build/coreboot.rom -nographic |head -5

[NOTE ]  coreboot-4.21 Fri Nov 17 12:09:01 UTC 2023 x86_32
        bootblock starting (log level: 7)...
...

Now set it to silent and try again, to see that the bootblock output is
suppressed, so that the first output shown is the romstage:

$ cbfstool build/coreboot.rom ccb-get -n console -V silent
console=silent

$ qemu-system-i386 -bios build/coreboot.rom -nographic
(no output)

Change-Id: I04e946b33035a493e833500351a0483761252613
Signed-off-by: Simon Glass 
---
M Documentation/util/cbfstool/ccb.md
M src/commonlib/include/commonlib/ccb.h
M src/console/console.c
M src/console/init.c
M src/include/console/streams.h
M util/cbfstool/cbfstool.c
6 files changed, 78 insertions(+), 8 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/12/77712/6