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 <scott@notabs.org>
Acked-by: Peter Stuge <peter@stuge.se>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@6067 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
diff --git a/src/include/cpu/amd/mtrr.h b/src/include/cpu/amd/mtrr.h
index e866fb95..6e25aa3 100644
--- a/src/include/cpu/amd/mtrr.h
+++ b/src/include/cpu/amd/mtrr.h
@@ -8,6 +8,7 @@
#define MTRR_WRITE_MEM (1 << 3)
#define SYSCFG_MSR 0xC0010010
+#define SYSCFG_MSR_TOM2WB (1 << 22)
#define SYSCFG_MSR_TOM2En (1 << 21)
#define SYSCFG_MSR_MtrrVarDramEn (1 << 20)
#define SYSCFG_MSR_MtrrFixDramModEn (1 << 19)