Vladimir Serbinenko (phcoder@gmail.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/4080
-gerrit
commit 67aa85e5b62b6e663bf65a37dc6774d5cfffa241 Author: Vladimir Serbinenko phcoder@gmail.com Date: Thu Nov 14 18:49:26 2013 +0100
Remove MRC variables from 2065x CAR init.
2065x boards don't use MRC. And the space in question isn't used either.
Read number of variable range MTRRs from MSR rather than hardcoding it.
2ff is still zeroed out as unless you zero-out undocumented bits as well boot fails.
Tested on Lenovo X201.
Change-Id: Ic574193094e7d27c2d6a4d7d3e387d989578532e Signed-off-by: Vladimir Serbinenko phcoder@gmail.com --- src/cpu/intel/model_2065x/cache_as_ram.inc | 64 ++++++++++-------------------- 1 file changed, 22 insertions(+), 42 deletions(-)
diff --git a/src/cpu/intel/model_2065x/cache_as_ram.inc b/src/cpu/intel/model_2065x/cache_as_ram.inc index ec7335e..c01488c 100644 --- a/src/cpu/intel/model_2065x/cache_as_ram.inc +++ b/src/cpu/intel/model_2065x/cache_as_ram.inc @@ -27,11 +27,6 @@ #define CACHE_AS_RAM_SIZE CONFIG_DCACHE_RAM_SIZE #define CACHE_AS_RAM_BASE CONFIG_DCACHE_RAM_BASE
-/* Cache 4GB - MRC_SIZE_KB for MRC */ -#define CACHE_MRC_BYTES ((CONFIG_CACHE_MRC_SIZE_KB << 10) - 1) -#define CACHE_MRC_BASE (0xFFFFFFFF - CACHE_MRC_BYTES) -#define CACHE_MRC_MASK (~CACHE_MRC_BYTES) - #define CPU_PHYSMASK_HI (1 << (CONFIG_CPU_ADDR_BITS - 32) - 1)
#define NoEvictMod_MSR 0x2e0 @@ -54,7 +49,14 @@ wait_for_sipi: jc wait_for_sipi
post_code(0x21) - /* Zero out all fixed range and variable range MTRRs. */ + /* Clean-up MTRRdefType_MSR. */ + movl $MTRRdefType_MSR, %ecx + xorl %eax, %eax + xorl %edx, %edx + wrmsr + + post_code(0x22) + /* Zero out all fixed range MTRRs. */ movl $mtrr_table, %esi movl $((mtrr_table_end - mtrr_table) / 2), %edi xorl %eax, %eax @@ -67,12 +69,20 @@ clear_mtrrs: dec %edi jnz clear_mtrrs
- post_code(0x22) - /* Configure the default memory type to uncacheable. */ - movl $MTRRdefType_MSR, %ecx + /* Zero out all variable range MTRRs. */ + movl $MTRRcap_MSR, %ecx rdmsr - andl $(~0x00000cff), %eax + andl $0xff, %eax + shl $1, %eax + movl %eax, %edi + movl $0x200, %ecx + xorl %eax, %eax + xorl %edx, %edx +clear_var_mtrrs: wrmsr + add $1, %ecx + dec %edi + jnz clear_var_mtrrs
post_code(0x23) /* Set Cache-as-RAM base address. */ @@ -147,17 +157,6 @@ clear_mtrrs: wrmsr
post_code(0x27) -#if CONFIG_CACHE_MRC_BIN - /* Enable caching for ram init code to run faster */ - movl $MTRRphysBase_MSR(2), %ecx - movl $(CACHE_MRC_BASE | MTRR_TYPE_WRPROT), %eax - xorl %edx, %edx - wrmsr - movl $MTRRphysMask_MSR(2), %ecx - movl $(CACHE_MRC_MASK | MTRRphysMaskValid), %eax - movl $CPU_PHYSMASK_HI, %edx - wrmsr -#endif
post_code(0x28) /* Enable cache. */ @@ -165,9 +164,8 @@ clear_mtrrs: andl $(~(CR0_CacheDisable | CR0_NoWriteThrough)), %eax movl %eax, %cr0
- /* Set up the stack pointer below MRC variable space. */ - movl $(CACHE_AS_RAM_SIZE + CACHE_AS_RAM_BASE - \ - CONFIG_DCACHE_RAM_MRC_VAR_SIZE - 4 - 4096), %eax + /* Set up the stack pointer below the end of CAR. */ + movl $(CACHE_AS_RAM_SIZE + CACHE_AS_RAM_BASE - 4), %eax movl %eax, %esp
/* Restore the BIST result. */ @@ -212,16 +210,6 @@ before_romstage: andl $~1, %eax wrmsr
-#if CONFIG_CACHE_MRC_BIN - /* Clear MTRR that was used to cache MRC */ - xorl %eax, %eax - xorl %edx, %edx - movl $MTRRphysBase_MSR(2), %ecx - wrmsr - movl $MTRRphysMask_MSR(2), %ecx - wrmsr -#endif - post_code(0x33)
/* Enable cache. */ @@ -321,18 +309,10 @@ __main: jmp .Lhlt
mtrr_table: - .word 0x02FF - /* Fixed MTRRs */ .word 0x250, 0x258, 0x259 .word 0x268, 0x269, 0x26A .word 0x26B, 0x26C, 0x26D .word 0x26E, 0x26F - - /* Variable MTRRs */ - .word 0x200, 0x201, 0x202, 0x203 - .word 0x204, 0x205, 0x206, 0x207 - .word 0x208, 0x209, 0x20A, 0x20B - .word 0x20C, 0x20D, 0x20E, 0x20F mtrr_table_end: