From f3cce2f3c4ff4af4a386bddd49c92a55ad9cefa2 Mon Sep 17 00:00:00 2001 From: Scott Duplichan Date: Sat, 13 Nov 2010 19:07:59 +0000 Subject: MTRR related improvements for AMD family 10h and family 0Fh systems -- When building for UMA, reduce the limit for DRAM below 4GB from E0000000 to C0000000. This is needed to accomodate the UMA frame buffer. -- Correct problem where msr C0010010 bits 21 and 22 (MtrrTom2En and Tom2ForceMemTypeWB) are not set consistently across cores. -- Enable TOM2 only if DRAM is present above 4GB. -- Use AMD Tom2ForceMemTypeWB feature to avoid the need for variable MTRR ranges above 4GB. -- Add above4gb flag argument to function x86_setup_var_mtrrs. Clearing this flag causes x86_setup_var_mtrrs() to omit MTRR ranges for DRAM above 4GB. AMD systems use this option to conserve MTRRs. -- Northbridge.c change to deduct UMA memory from DRAM size reported by ram_resource. This corrects a problem where mtrr.c generates an unexpected variable MTRR range. -- Correct problem causing build failure when CONFIG_GFXUMA=1 and CONFIG_VAR_MTRR_HOLE=0. -- Reserve the UMA DRAM range for AMD K8 as is already done for AMD family 10h. Tested with mahogany on ECS A780G-GM with 2GB and 4GB. Tested with mahogany_fam10 on ECS A780G-GM with 2GB and 4GB. Signed-off-by: Scott Duplichan Acked-by: Peter Stuge git-svn-id: svn://svn.coreboot.org/coreboot/trunk@6067 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1 --- src/include/cpu/x86/mtrr.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'src/include/cpu/x86') diff --git a/src/include/cpu/x86/mtrr.h b/src/include/cpu/x86/mtrr.h index e79c90ea85..164d79af2a 100644 --- a/src/include/cpu/x86/mtrr.h +++ b/src/include/cpu/x86/mtrr.h @@ -37,7 +37,7 @@ #if !defined (ASSEMBLY) && !defined(__PRE_RAM__) #include void enable_fixed_mtrr(void); -void x86_setup_var_mtrrs(unsigned address_bits); +void x86_setup_var_mtrrs(unsigned int address_bits, unsigned int above4gb); void x86_setup_mtrrs(unsigned address_bits); int x86_mtrr_check(void); void set_var_mtrr_resource(void *gp, struct device *dev, struct resource *res); -- cgit v1.2.3