nb/intel/nehalem: Move to C_ENVIRONMENT_BOOTBLOCK

A few notable changes:
- Microcode init is done in assembly during the CAR init.
- The DCACHE_BSP_STACK_SIZE is set to 0x2000, which is the same size
  against which the romstage stack guards protected.
- The romstage mainboard_lpc_init() hook is removed in favor of the
  existing bootblock_mainboard_early_init().

Change-Id: Iccd7ceaa35db49e170bfb901bbff1c1a11223c63
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35951
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>

src/northbridge/intel/nehalem/Kconfig

@@ -21,6 +21,7 @@ config NORTHBRIDGE_INTEL_NEHALEM
 	select INTEL_GMA_ACPI
 	select CACHE_MRC_SETTINGS
 	select HAVE_DEBUG_RAM_SETUP
+	select C_ENVIRONMENT_BOOTBLOCK
 
 if NORTHBRIDGE_INTEL_NEHALEM
 
@@ -48,9 +49,12 @@ config DCACHE_RAM_SIZE
 	hex
 	default 0x10000
 
-config BOOTBLOCK_NORTHBRIDGE_INIT
-	string
-	default "northbridge/intel/nehalem/bootblock.c"
+config DCACHE_BSP_STACK_SIZE
+	hex
+	default 0x2000
+	help
+	  The amount of anticipated stack usage in CAR by bootblock and
+	  other stages.
 
 config MRC_CACHE_SIZE
 	hex

src/northbridge/intel/nehalem/Makefile.inc

@@ -15,6 +15,8 @@
 
 ifeq ($(CONFIG_NORTHBRIDGE_INTEL_NEHALEM),y)
 
+bootblock-y += bootblock.c
+
 ramstage-y += memmap.c
 ramstage-y += northbridge.c
 ramstage-y += smi.c

src/northbridge/intel/nehalem/bootblock.c

@@ -12,8 +12,9 @@
  */
 
 #include <device/pci_ops.h>
+#include <cpu/intel/car/bootblock.h>
 
-static void bootblock_northbridge_init(void)
+void bootblock_early_northbridge_init(void)
 {
 	pci_io_write_config32(PCI_DEV(0xff, 0x00, 1), 0x50, CONFIG_MMCONF_BASE_ADDRESS | 1);
 	pci_io_write_config32(PCI_DEV(0xff, 0x00, 1), 0x54, 0);

src/northbridge/intel/nehalem/romstage.c

@@ -45,11 +45,6 @@ void mainboard_romstage_entry(void)
 	/* TODO, make this configurable */
 	nehalem_early_initialization(NEHALEM_MOBILE);
 
-	pch_pre_console_init();
-
-	/* Initialize console device(s) */
-	console_init();
-
 	early_pch_init();
 
 	/* Read PM1_CNT, DON'T CLEAR IT or raminit will fail! */