FSP platforms: Clear area in CAR for cbmem
This patch clears the CAR area. The FSP loads the entire CAR area with a
pattern instead of clearing it. At least the cbmem area needs to be
cleared or cbmem will not use it.
Change-Id: I829ddc26133353a784dfc01729af9b3bf427e889
Signed-off-by: Martin Roth <gaumless@gmail.com>
Reviewed-on: http://review.coreboot.org/8195
Reviewed-by: Aaron Durbin <adurbin@google.com>
Tested-by: build bot (Jenkins)
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
diff --git a/src/drivers/intel/fsp/cache_as_ram.inc b/src/drivers/intel/fsp/cache_as_ram.inc
index 9e8b2a2..8604c3b 100644
--- a/src/drivers/intel/fsp/cache_as_ram.inc
+++ b/src/drivers/intel/fsp/cache_as_ram.inc
@@ -91,14 +91,22 @@
* ecx: stack base
* edx: stack top
*/
- lea -4(%edx), %esp
+ mov %edx, %esp
movl %esp, %ebp
- pushl %ebx
+
+ /* Clear the cbmem CAR memory region. */
+ movl %ecx, %edi
+ movl %edx, %ecx
+ sub %edi, %ecx
+ shr $2, %ecx
+ xorl %eax, %eax
+ rep stosl
before_romstage:
post_code(0x23)
/* Call romstage.c main function. */
+ pushl %ebx /* main takes FSP_INFO_HEADER as its argument */
call main /* does not return */
movb $0xB8, %ah
jmp .Lhlt