3rdparty/blobs: Update submodule, SNB improvements

The sandybridge systemagent-r6 blob is modified:
- To be more flexible about the location of the stack w.r.t. the heap
- Place the MRC pool right below the MRC_VAR region
- to work with the same DCACHE_RAM_BASE from the native raminit (could
  make the CAR linker symbols easily compatible if desired)

This allows CAR setup compatibility between mrc.bin and native
bootpath and also allows for BIOS/memory mappeds region larger than
8MB.

This changes the semantics of CONFIG_DACHE_RAM_MRC_VAR_SIZE to also
include the pool on top of MRC_VAR region.

TESTED on T520 (boots and resumes from S3 with mrc.bin).

Change-Id: I17d240656575b69a24718d90e4f2d2b7339d05a7
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/33228
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 24 insertions, 2 deletions

diff --git a/src/northbridge/intel/sandybridge/raminit_mrc.c b/src/northbridge/intel/sandybridge/raminit_mrc.c
index e88d356593..a8acfbf980 100644
--- a/src/northbridge/intel/sandybridge/raminit_mrc.c
+++ b/src/northbridge/intel/sandybridge/raminit_mrc.c
@@ -265,9 +265,31 @@ void sdram_initialize(struct pei_data *pei_data)
 	report_memory_config();
 }
 
-/* These are the location and structure of MRC_VAR data in CAR. */
+/* These are the location and structure of MRC_VAR data in CAR.
+   The CAR region looks like this:
+   +------------------+ -> DCACHE_RAM_BASE
+   |                  |
+   |                  |
+   |  COREBOOT STACK  |
+   |                  |
+   |                  |
+   +------------------+ -> DCACHE_RAM_BASE + DCACHE_RAM_SIZE
+   |                  |
+   |  MRC HEAP        |
+   |  size = 0x5000   |
+   |                  |
+   +------------------+
+   |                  |
+   |  MRC VAR         |
+   |  size = 0x4000   |
+   |                  |
+   +------------------+ -> DACHE_RAM_BASE + DACHE_RAM_SIZE
+                                 + DCACHE_RAM_MRC_VAR_SIZE
+
+ */
 #define DCACHE_RAM_MRC_VAR_BASE \
-	(CONFIG_DCACHE_RAM_BASE + CONFIG_DCACHE_RAM_SIZE)
+	(CONFIG_DCACHE_RAM_BASE + CONFIG_DCACHE_RAM_SIZE + \
+	 CONFIG_DCACHE_RAM_MRC_VAR_SIZE - 0x4000)
 
 struct mrc_var_data {
 	u32 acpi_timer_flag;