[S] Change in coreboot[main]: soc/mediatek: Add EARLY_INIT_MMU kconfig option

[Yidi Lin (Code Review)]

Attention is currently required from: Hung-Te Lin, Yu-Ping Wu.

Hello Hung-Te Lin, Yu-Ping Wu,

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

https://review.coreboot.org/c/coreboot/+/79990?usp=email

to look at the new patch set (#2).

Change subject: soc/mediatek: Add EARLY_INIT_MMU kconfig option
......................................................................

soc/mediatek: Add EARLY_INIT_MMU kconfig option

Accessing RAM before mmu initialized is time consuming. During mmu
initialization, `mmu_init()` and `mmu_config_range()` write logs to the
console buffer and contribue the extra boot time.

This patch adds a kconfig option to move `mtk_mmu_init()` to
`bootblock_soc_early_init()`. When `EARLY_INIT_MMU` is enabled, mmu is
initialized before `console_init()` ready. So `mmu_init()` and
`mmu_config_range()` won't write logs to the console buffer and save the
boot time.

It saves about 65ms on Geralt with EARLY_INIT_MMU enabled.

Before:
   0:1st timestamp                                     239,841 (0)
  11:start of bootblock                                239,920 (79)
  12:end of bootblock                                  323,191 (83,271)

After:
   0:1st timestamp                                     239,804 (0)
  11:start of bootblock                                239,884 (80)
  12:end of bootblock                                  258,846 (18,962)

BUG=b:320381143
TEST=check timestamps in cbmem

Change-Id: I7f4c3c6c836f7276119698c6de362794cf4222a6
Signed-off-by: Yidi Lin 
---
M src/soc/mediatek/common/Kconfig
A src/soc/mediatek/common/bootblock.c
M src/soc/mediatek/common/mmu_operations.c
M src/soc/mediatek/mt8188/Makefile.inc
4 files changed, 24 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/90/79990/2