Attention is currently required from: Hung-Te Lin, Yidi Lin.
Yidi Lin uploaded patch set #3 to this change.
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 <yidilin@chromium.org>
---
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, 25 insertions(+), 1 deletion(-)
git pull ssh://review.coreboot.org:29418/coreboot refs/changes/90/79990/3
To view, visit change 79990. To unsubscribe, or for help writing mail filters, visit settings.