Aaron Durbin (adurbin@google.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/4868
-gerrit
commit 4a65397b2706837059afa474f77ea1ab0430ecd2 Author: Aaron Durbin adurbin@chromium.org Date: Mon Oct 7 16:24:44 2013 -0500
baytrail: adjust cache policy during romstage
The caching policy for romstage was previously using a 32KiB of cache-as-ram for both the MRC wrapper and the romstage stack/data. It also used a 32KiB code cache region. The BWG's limitations for the code and data region before memory is up was wrong. It consists of a 16-way set associative 1MiB cache. As long as enough addresses are not read there isn't a risk of evicting the data/stack.
Now create a 64KiB cache-as-ram region split evenly between romstage and the MRC wrapper. Additionally cache the memory just below 4GiB in CBFS size. This will cover any code and read-only data needed.
BUG=chrome-os-partner:22858 BRANCH=None TEST=Built and booted quickly with corresponding changes to MRC warpper. CQ-DEPEND=CL:*146175
Change-Id: I021cecb886a9c0622005edc389136d22905d4520 Signed-off-by: Aaron Durbin adurbin@chromium.org Reviewed-on: https://chromium-review.googlesource.com/172150 Reviewed-by: Duncan Laurie dlaurie@chromium.org --- src/soc/intel/baytrail/Kconfig | 15 +++------------ src/soc/intel/baytrail/romstage/cache_as_ram.inc | 14 +++++++------- 2 files changed, 10 insertions(+), 19 deletions(-)
diff --git a/src/soc/intel/baytrail/Kconfig b/src/soc/intel/baytrail/Kconfig index 613593e..4cd2133 100644 --- a/src/soc/intel/baytrail/Kconfig +++ b/src/soc/intel/baytrail/Kconfig @@ -92,15 +92,6 @@ endif # CACHE_MRC_SETTINGS
endif # HAVE_MRC
-config CAR_TILE_SIZE - hex - default 0x8000 - help - The tile size is the limit that can be assigned to cache-as-ram - region as well as the amount of code cache used during cache-as-ram. - Also note that (DCACHE_RAM_BASE ^ MRC_BIN_ADDRESS) & CAR_TILE_SIZE == - CAR_TILE_SIZE. - # Cache As RAM region layout: # # +-------------+ DCACHE_RAM_BASE + DCACHE_RAM_SIZE + DCACHE_RAM_MRC_VAR_SIZE @@ -123,11 +114,11 @@ config CAR_TILE_SIZE
config DCACHE_RAM_BASE hex - default 0xff7f8000 + default 0xff800000
config DCACHE_RAM_SIZE hex - default 0x1000 + default 0x8000 help The size of the cache-as-ram region required during bootblock and/or romstage. Note DCACHE_RAM_SIZE and DCACHE_RAM_MRC_VAR_SIZE @@ -135,7 +126,7 @@ config DCACHE_RAM_SIZE
config DCACHE_RAM_MRC_VAR_SIZE hex - default 0x7000 + default 0x8000 help The amount of cache-as-ram region required by the reference code.
diff --git a/src/soc/intel/baytrail/romstage/cache_as_ram.inc b/src/soc/intel/baytrail/romstage/cache_as_ram.inc index 82c77e2..f6e029d 100644 --- a/src/soc/intel/baytrail/romstage/cache_as_ram.inc +++ b/src/soc/intel/baytrail/romstage/cache_as_ram.inc @@ -31,10 +31,10 @@ (CONFIG_DCACHE_RAM_SIZE + CONFIG_DCACHE_RAM_MRC_VAR_SIZE) #define CACHE_AS_RAM_BASE CONFIG_DCACHE_RAM_BASE
-/* Enough room to cache CAR_TILE_SIZE starting at MRC_BIN_ADDRESS */ -#define CACHE_MRC_BASE (CONFIG_MRC_BIN_ADDRESS) -#define CACHE_MRC_MASK (~(CONFIG_CAR_TILE_SIZE - 1)) - +/* Cache all of CBFS just below 4GiB as Write-Protect type. */ +#define CODE_CACHE_SIZE (CONFIG_CBFS_SIZE) +#define CODE_CACHE_BASE (-CODE_CACHE_SIZE) +#define CODE_CACHE_MASK (~(CODE_CACHE_SIZE - 1)) #define CPU_PHYSMASK_HI ((1 << (CONFIG_CPU_ADDR_BITS - 32)) - 1)
#define NoEvictMod_MSR 0x2e0 @@ -109,14 +109,14 @@ wait_for_sipi: wrmsr
post_code(0x25) - /* Set Cache-as-RAM base address. */ + /* Set code caching up for romstage. */ movl $(MTRRphysBase_MSR(1)), %ecx - movl $(CACHE_MRC_BASE | MTRR_TYPE_WRPROT), %eax + movl $(CODE_CACHE_BASE | MTRR_TYPE_WRPROT), %eax xorl %edx, %edx wrmsr
movl $(MTRRphysMask_MSR(1)), %ecx - movl $(CACHE_MRC_MASK | MTRRphysMaskValid), %eax + movl $(CODE_CACHE_MASK | MTRRphysMaskValid), %eax movl $CPU_PHYSMASK_HI, %edx wrmsr
-
Aaron Durbin