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-rw-r--r--src/arch/x86/car.ld8
-rw-r--r--src/northbridge/intel/sandybridge/raminit_mrc.c26
2 files changed, 34 insertions, 0 deletions
diff --git a/src/arch/x86/car.ld b/src/arch/x86/car.ld
index 2d835a3b46..43608309aa 100644
--- a/src/arch/x86/car.ld
+++ b/src/arch/x86/car.ld
@@ -85,6 +85,14 @@
_car_global_end = .;
_car_relocatable_data_end = .;
+#if IS_ENABLED(CONFIG_NORTHBRIDGE_INTEL_SANDYBRIDGE) && \
+ !IS_ENABLED(CONFIG_USE_NATIVE_RAMINIT)
+ . = ABSOLUTE(0xff7e1000);
+ _mrc_pool = .;
+ . += 0x5000;
+ _emrc_pool = .;
+#endif
+
#if !IS_ENABLED(CONFIG_C_ENVIRONMENT_BOOTBLOCK)
_car_stack_start = .;
_car_stack_end = _car_region_end;
diff --git a/src/northbridge/intel/sandybridge/raminit_mrc.c b/src/northbridge/intel/sandybridge/raminit_mrc.c
index 6142388c5b..853fdb83d0 100644
--- a/src/northbridge/intel/sandybridge/raminit_mrc.c
+++ b/src/northbridge/intel/sandybridge/raminit_mrc.c
@@ -25,6 +25,7 @@
#include <ip_checksum.h>
#include <pc80/mc146818rtc.h>
#include <device/pci_def.h>
+#include <lib.h>
#include <mrc_cache.h>
#include <halt.h>
#include <timestamp.h>
@@ -262,10 +263,23 @@ void sdram_initialize(struct pei_data *pei_data)
report_memory_config();
}
+/* These are the location and structure of MRC_VAR data in CAR. */
+#define DCACHE_RAM_MRC_VAR_BASE \
+ (CONFIG_DCACHE_RAM_BASE + CONFIG_DCACHE_RAM_SIZE)
+
+struct mrc_var_data {
+ u32 acpi_timer_flag;
+ u32 pool_used;
+ u32 pool_base;
+ u32 tx_byte;
+ u32 reserved[4];
+} __packed;
+
void perform_raminit(int s3resume)
{
int cbmem_was_initted;
struct pei_data pei_data;
+ struct mrc_var_data *mrc_var;
/* Prepare USB controller early in S3 resume */
if (!mainboard_should_reset_usb(s3resume))
@@ -277,6 +291,18 @@ void perform_raminit(int s3resume)
pei_data.boot_mode = s3resume ? 2 : 0;
timestamp_add_now(TS_BEFORE_INITRAM);
sdram_initialize(&pei_data);
+
+ mrc_var = (void *)DCACHE_RAM_MRC_VAR_BASE;
+ /* Sanity check mrc_var location by verifying a known field. */
+ if (mrc_var->tx_byte == (uintptr_t)pei_data.tx_byte) {
+ printk(BIOS_DEBUG, "MRC_VAR pool occupied [%08x,%08x]\n",
+ mrc_var->pool_base,
+ mrc_var->pool_base + mrc_var->pool_used);
+ } else {
+ printk(BIOS_ERR, "Could not parse MRC_VAR data\n");
+ hexdump32(BIOS_ERR, mrc_var, sizeof(*mrc_var)/sizeof(u32));
+ }
+
cbmem_was_initted = !cbmem_recovery(s3resume);
if (!s3resume)
save_mrc_data(&pei_data);