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>

3rdparty/blobs

@@ -1 +1 @@
-Subproject commit ca6cfcdbe1cdeb38c2622ee2e5236cc4657e3377
+Subproject commit d7600dd8718a076f0f9a89e53968b484254624dc

src/arch/x86/car.ld

@@ -91,13 +91,6 @@
 	_car_global_end = .;
 	_car_relocatable_data_end = .;
 
-#if CONFIG(NORTHBRIDGE_INTEL_SANDYBRIDGE) && !CONFIG(USE_NATIVE_RAMINIT)
-	. = ABSOLUTE(0xff7e1000);
-	_mrc_pool = .;
-	. += 0x5000;
-	_emrc_pool = .;
-#endif
-
 #if !CONFIG(C_ENVIRONMENT_BOOTBLOCK)
 	_car_stack_start = .;
 	_car_stack_end = _car_region_end;

src/northbridge/intel/sandybridge/Kconfig

@@ -78,12 +78,13 @@ config MMCONF_BASE_ADDRESS
 	help
 	  The MRC blob requires it to be at 0xf0000000.
 
-if USE_NATIVE_RAMINIT
-
 config DCACHE_RAM_BASE
 	hex
 	default 0xfefe0000
 
+
+if USE_NATIVE_RAMINIT
+
 config DCACHE_RAM_SIZE
 	hex
 	default 0x20000
@@ -96,17 +97,13 @@ endif # USE_NATIVE_RAMINIT
 
 if !USE_NATIVE_RAMINIT
 
-config DCACHE_RAM_BASE
-	hex
-	default 0xff7e0000
-
 config DCACHE_RAM_SIZE
 	hex
-	default 0x1c000
+	default 0x17000
 
 config DCACHE_RAM_MRC_VAR_SIZE
 	hex
-	default 0x4000
+	default 0x9000
 
 config MRC_FILE
 	string "Intel System Agent path and filename"

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;