[coreboot-gerrit] Patch set updated for coreboot: soc/intel/apollolake: Handle CAR sizes other than 1 MiB
Andrey Petrov (andrey.petrov@intel.com)
gerrit at coreboot.org
Tue Aug 23 23:58:12 CEST 2016
Andrey Petrov (andrey.petrov at intel.com) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/15453
-gerrit
commit bd87f3cb87a21cd6a9e19e5bf58a27f98df195fd
Author: Andrey Petrov <andrey.petrov at intel.com>
Date: Mon Jun 27 15:21:26 2016 -0700
soc/intel/apollolake: Handle CAR sizes other than 1 MiB
Since whole L2 (1MiB) is not used, it is possible to shrink CAR size
to 768 KiB. Since 768 KiB is not power of two, 2 MTRRs are used to
set it up. This is a part of CQOS enabling.
BUG=chrome-os-partner:51959
Change-Id: I56326a1790df202a0e428e092dd90286c58763c5
Signed-off-by: Andrey Petrov <andrey.petrov at intel.com>
---
src/soc/intel/apollolake/Kconfig | 2 +-
src/soc/intel/apollolake/bootblock/cache_as_ram.S | 27 +++++++++++++++++++++++
2 files changed, 28 insertions(+), 1 deletion(-)
diff --git a/src/soc/intel/apollolake/Kconfig b/src/soc/intel/apollolake/Kconfig
index db4559c..a92a052 100644
--- a/src/soc/intel/apollolake/Kconfig
+++ b/src/soc/intel/apollolake/Kconfig
@@ -97,7 +97,7 @@ config DCACHE_RAM_BASE
config DCACHE_RAM_SIZE
hex "Length in bytes of cache-as-RAM"
- default 0x100000
+ default 0xc0000
help
The size of the cache-as-ram region required during bootblock
and/or romstage.
diff --git a/src/soc/intel/apollolake/bootblock/cache_as_ram.S b/src/soc/intel/apollolake/bootblock/cache_as_ram.S
index 8647206..e8fae28 100644
--- a/src/soc/intel/apollolake/bootblock/cache_as_ram.S
+++ b/src/soc/intel/apollolake/bootblock/cache_as_ram.S
@@ -17,6 +17,7 @@
*/
#include <device/pci_def.h>
+#include <commonlib/helpers.h>
#include <cpu/x86/mtrr.h>
#include <cpu/x86/cache.h>
#include <cpu/x86/cr.h>
@@ -70,6 +71,7 @@ clear_var_mtrr:
post_code(0x24)
+#if ((CONFIG_DCACHE_RAM_SIZE & (CONFIG_DCACHE_RAM_SIZE - 1)) == 0)
/* Configure CAR region as write-back (WB) */
mov $MTRR_PHYS_BASE(0), %ecx
mov $CONFIG_DCACHE_RAM_BASE, %eax
@@ -82,6 +84,31 @@ clear_var_mtrr:
mov $~(CONFIG_DCACHE_RAM_SIZE - 1), %eax /* size mask */
or $MTRR_PHYS_MASK_VALID, %eax
wrmsr
+#elif (CONFIG_DCACHE_RAM_SIZE == 768 * KiB) /* 768 KiB */
+ mov $MTRR_PHYS_BASE(0), %ecx
+ mov $CONFIG_DCACHE_RAM_BASE, %eax
+ or $MTRR_TYPE_WRBACK, %eax
+ xor %edx,%edx
+ wrmsr
+
+ mov $MTRR_PHYS_MASK(0), %ecx
+ mov $~(512 * KiB - 1), %eax /* size mask */
+ or $MTRR_PHYS_MASK_VALID, %eax
+ wrmsr
+
+ mov $MTRR_PHYS_BASE(1), %ecx
+ mov $(CONFIG_DCACHE_RAM_BASE + 512 * KiB), %eax
+ or $MTRR_TYPE_WRBACK, %eax
+ xor %edx,%edx
+ wrmsr
+
+ mov $MTRR_PHYS_MASK(1), %ecx
+ mov $~(256 * KiB - 1), %eax /* size mask */
+ or $MTRR_PHYS_MASK_VALID, %eax
+ wrmsr
+#else
+#error "DCACHE_RAM_SIZE is not a power of 2 and setup code is missing"
+#endif
post_code(0x25)
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