GNUBoot
/
coreboot-kgpe-d16
2
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

soc/intel/apollolake: Set default memory type to uncacheable 

Set the default memory type in MTRRCap register to 0. This ensures
that even if the MTRR Enable bit is set in MTRRCap register, the
default memory type is still uncacheable.

Change-Id: I63e7993f8b65dabbab60e7c1bb8d6d89ef4da9ee
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://review.coreboot.org/14428
Tested-by: build bot (Jenkins)
Reviewed-by: Andrey Petrov <andrey.petrov@intel.com>
This commit is contained in:
Furquan Shaikh 2016-04-19 15:49:23 -07:00
parent defbdcf3e5
commit 581c42807d
1 changed files with 3 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
src/soc/intel/apollolake/bootblock/cache_as_ram.S
View File

@ -63,7 +63,9 @@ clear_var_mtrr:
/* Configure default memory type to uncacheable (UC) */ /* Configure default memory type to uncacheable (UC) */
mov $MTRR_DEF_TYPE_MSR, %ecx mov $MTRR_DEF_TYPE_MSR, %ecx
rdmsr rdmsr
and $MTRR_DEF_TYPE_MASK, %eax /* Clear enable bits and set default type to UC. */
and $~(MTRR_DEF_TYPE_MASK | MTRR_DEF_TYPE_EN | \
MTRR_DEF_TYPE_FIX_EN), %eax
wrmsr wrmsr
post_code(0x24) post_code(0x24)