soc/amd/cezanne,picasso,sabrina: Fix incorrect values of CBFS amdfw position makefile variables

Currently apu/amdfw_a-position and apu/amdfw_b-position currently depend on CEZANNE_FW_A_POSITION and CEZANNE_FW_B_POSITION. This causes error messages from awk as these variables are sourced from fmap_config.h and these variables are expanded before fmap_config.h is built. However these variables should not be set to CEZANNE_FW_*_POSITION. These files end up in the FW_MAIN_* fmap regions. These regions are placed at the proper locations through the chromeos.fmd file. The apu/amdfw_*-position variables are the positions within these regions where the files end up. These variables should be set to 0x40 to coincide with the beginning of the FW_MAIN_* regions, accounting for the size of struct cbfs_file + filename + metadata, aligned to 64 bytes. Currently they end up in the correct locations only because fmap_config.h does not exist when the apu/amdfw_*-position variables are expanded.
This change explicity sets the value of these variables to 0x40, removing the errors from awk and ensuring that these files end up in the correct location in the resulting image. These changes are also applied to the Picasso and Sabrina makefiles as well.

BUG=b:198322933
TEST=Verified that the apu/amdfw_* files end up in the correct locations as reported by cbfstool during the build, did timeless builds and confirmed that coreboot.rom images were identical, tested AP firmware on guybrush and zork devices
Signed-off-by: Robert Zieba <robertzieba@google.com>
Change-Id: If1c2b61c5be0bcab52e19349dacbcc391e8aa909
Reviewed-on: https://review.coreboot.org/c/coreboot/+/61349
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-by: Rob Barnes <robbarnes@google.com>

2 files changed, 16 insertions, 14 deletions

diff --git a/src/soc/amd/picasso/Kconfig b/src/soc/amd/picasso/Kconfig
index ebcbd62068b0..558f30110fac 100644
--- a/src/soc/amd/picasso/Kconfig
+++ b/src/soc/amd/picasso/Kconfig
@@ -517,16 +517,6 @@ config RWB_REGION_ONLY
 	  Add a space-delimited list of filenames that should only be in the
 	  RW-B section.
 
-config PICASSO_FW_A_POSITION
-	hex
-	help
-	  Location of the AMD firmware in the RW_A region
-
-config PICASSO_FW_B_POSITION
-	hex
-	help
-	  Location of the AMD firmware in the RW_B region
-
 endif # VBOOT_SLOTS_RW_AB && VBOOT_STARTS_BEFORE_BOOTBLOCK
 
 endif # SOC_AMD_PICASSO
diff --git a/src/soc/amd/picasso/Makefile.inc b/src/soc/amd/picasso/Makefile.inc
index de16da4bd154..8eef1538cc4b 100644
--- a/src/soc/amd/picasso/Makefile.inc
+++ b/src/soc/amd/picasso/Makefile.inc
@@ -77,6 +77,18 @@ PICASSO_FWM_POSITION=$(call int-add, \
 	$(call int-shift-left, \
 	0x80000 $(CONFIG_AMD_FWM_POSITION_INDEX))) 0x20000 1)
 
+# 0x40 accounts for the cbfs_file struct + filename + metadata structs, aligned to 64 bytes
+# Building the cbfs image will fail if the offset isn't large enough
+AMD_FW_AB_POSITION := 0x40
+
+PICASSO_FW_A_POSITION=$(call int-add, \
+	$(shell awk '$$2 == "FMAP_SECTION_FW_MAIN_A_START" {print $$3}' $(obj)/fmap_config.h) \
+	$(AMD_FW_AB_POSITION))
+
+PICASSO_FW_B_POSITION=$(call int-add, \
+	$(shell awk '$$2 == "FMAP_SECTION_FW_MAIN_B_START" {print $$3}' $(obj)/fmap_config.h) \
+	$(AMD_FW_AB_POSITION))
+
 #
 # PSP Directory Table items
 #
@@ -248,7 +260,7 @@ $(obj)/amdfw_a.rom: $(obj)/amdfw.rom
 		$(AMDFW_COMMON_ARGS) \
 		$(OPT_APOB_NV_SIZE) \
 		$(OPT_APOB_NV_BASE) \
-		--location $(shell printf "%#x" $(CONFIG_PICASSO_FW_A_POSITION)) \
+		--location $(shell printf "%#x" $(PICASSO_FW_A_POSITION)) \
 		--anywhere \
 		--output $@
 
@@ -259,7 +271,7 @@ $(obj)/amdfw_b.rom: $(obj)/amdfw.rom
 		$(AMDFW_COMMON_ARGS) \
 		$(OPT_APOB_NV_SIZE) \
 		$(OPT_APOB_NV_BASE) \
-		--location $(shell printf "%#x" $(CONFIG_PICASSO_FW_B_POSITION)) \
+		--location $(shell printf "%#x" $(PICASSO_FW_B_POSITION)) \
 		--anywhere \
 		--output $@
 
@@ -271,12 +283,12 @@ apu/amdfw-type := raw
 ifeq ($(CONFIG_VBOOT_SLOTS_RW_AB)$(CONFIG_VBOOT_STARTS_BEFORE_BOOTBLOCK),yy)
 cbfs-files-y += apu/amdfw_a
 apu/amdfw_a-file := $(obj)/amdfw_a.rom
-apu/amdfw_a-position := $(call strip_quotes, $(CONFIG_PICASSO_FW_A_POSITION))
+apu/amdfw_a-position := $(AMD_FW_AB_POSITION)
 apu/amdfw_a-type := raw
 
 cbfs-files-y += apu/amdfw_b
 apu/amdfw_b-file := $(obj)/amdfw_b.rom
-apu/amdfw_b-position := $(call strip_quotes, $(CONFIG_PICASSO_FW_B_POSITION))
+apu/amdfw_b-position := $(AMD_FW_AB_POSITION)
 apu/amdfw_b-type := raw
 endif