CBFS: Correct ROM_SIZE for ARM boards, use CBFS_SIZE for cbfstool

Some projects (like ChromeOS) put more content than described by CBFS
onto their image. For top-aligned images (read: x86), this has
traditionally been achieved with a CBFS_SIZE Kconfig (which denotes the
area actually managed by CBFS, as opposed to ROM_SIZE) that is used to
calculate the CBFS entry start offset. On bottom-aligned boards, many
define a fake (smaller) ROM_SIZE for only the CBFS part, which is not
consistently done and can be an issue because ROM_SIZE is expected to be
a power of two.

This patch changes all non-x86 boards to describe their actual
(physical) ROM size via one of the BOARD_ROMSIZE_KB_xxx options as a
mainboard Kconfig select (which is the correct place to declare
unchangeable physical properties of the board). It also changes the
cbfstool create invocation to use CBFS_SIZE as the -s parameter for
those architectures, which defaults to ROM_SIZE but gets overridden for
special use cases like ChromeOS. This has the advantage that cbfstool
has a consistent idea of where the area it is responsible for ends,
which offers better bounds-checking and is needed for a subsequent fix.

Also change the FMAP offset to default to right behind the (now
consistently known) CBFS region for non-x86 boards, which has emerged as
a de-facto standard on those architectures and allows us to reduce the
amount of custom configuration. In the future, the nightmare that is
ChromeOS's image build system could be redesigned to enforce this
automatically, and also confirm that it doesn't overwrite any space used
by CBFS (which is now consistently defined as the file size of
coreboot.rom on non-x86).

CQ-DEPEND=CL:231576,CL:231475
BRANCH=None
BUG=chromium:422501
TEST=Built and booted on Veyron_Pinky.

Change-Id: I89aa5b30e25679e074d4cb5eee4c08178892ada6
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: e707c67c69599274b890d0686522880aa2e16d71
Original-Change-Id: I4fce5a56a8d72f4c4dd3a08c129025f1565351cc
Original-Signed-off-by: Julius Werner <jwerner@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/229974
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/9619
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
diff --git a/Makefile.inc b/Makefile.inc
index 10759f5..9c043c4 100644
--- a/Makefile.inc
+++ b/Makefile.inc
@@ -528,7 +528,7 @@
 prebuilt-files = $(foreach file,$(cbfs-files), $(call extract_nth,1,$(file)))
 
 $(obj)/coreboot.pre1: $(objcbfs)/bootblock.bin $$(prebuilt-files) $(CBFSTOOL) $$(cpu_ucode_cbfs_file)
-	$(CBFSTOOL) $@.tmp create -s $(CONFIG_COREBOOT_ROMSIZE_KB)K \
+	$(CBFSTOOL) $@.tmp create \
 	-B $(objcbfs)/bootblock.bin -a 64 \
 	$(CBFSTOOL_PRE1_OPTS)
 	$(prebuild-files) true
@@ -557,7 +557,10 @@
 
 $(obj)/coreboot.rom: $(obj)/coreboot.pre $(objcbfs)/ramstage.elf $(CBFSTOOL) $(call strip_quotes,$(COREBOOT_ROM_DEPENDENCIES)) $$(INTERMEDIATE) $$(VBOOT_STUB) $(REFCODE_BLOB)
 	@printf "    CBFS       $(subst $(obj)/,,$(@))\n"
-	cp $(obj)/coreboot.pre $@.tmp
+# The full ROM may be larger than the CBFS part, so create an empty
+# file (filled with \377 = 0xff) and copy the CBFS image over it.
+	tr '\000' '\377' < /dev/zero 2> /dev/null | dd of=$@.tmp bs=8192 iflag=fullblock count=$$(($(CONFIG_ROM_SIZE) / 8192)) 2> /dev/null
+	dd if=$(obj)/coreboot.pre of=$@.tmp bs=8192 conv=notrunc 2> /dev/null
 	$(CBFSTOOL) $@.tmp add-stage -f $(objcbfs)/ramstage.elf -n $(CONFIG_CBFS_PREFIX)/ramstage -c $(CBFS_COMPRESS_FLAG)
 ifeq ($(CONFIG_PAYLOAD_NONE),y)
 	@printf "    PAYLOAD    none (as specified by user)\n"
diff --git a/src/Kconfig b/src/Kconfig
index 377f7cf..8a5d905 100644
--- a/src/Kconfig
+++ b/src/Kconfig
@@ -413,8 +413,14 @@
 	default n
 
 config CBFS_SIZE
-	hex
+	hex "Size of CBFS filesystem in ROM"
 	default ROM_SIZE
+	help
+	  This is the part of the ROM actually managed by CBFS, located at the
+	  end of the ROM (passed through cbfstool -o) on x86 and at at the start
+	  of the ROM (passed through cbfstool -s) everywhere else. Defaults to
+	  span the whole ROM but can be overwritten to make coreboot live
+	  alongside other components (like ChromeOS's vboot/FMAP).
 
 config CACHE_ROM_SIZE_OVERRIDE
 	hex
diff --git a/src/arch/arm/Makefile.inc b/src/arch/arm/Makefile.inc
index 4277ca7..cfdb576 100644
--- a/src/arch/arm/Makefile.inc
+++ b/src/arch/arm/Makefile.inc
@@ -31,7 +31,9 @@
 ###############################################################################
 
 ifeq ($(CONFIG_ARCH_ROMSTAGE_ARM),y)
-CBFSTOOL_PRE1_OPTS = -m arm -b $(CONFIG_BOOTBLOCK_ROM_OFFSET) -H $(CONFIG_CBFS_HEADER_ROM_OFFSET) -o $(CONFIG_CBFS_ROM_OFFSET)
+CBFSTOOL_PRE1_OPTS = -m arm -b $(CONFIG_BOOTBLOCK_ROM_OFFSET) \
+		     -H $(CONFIG_CBFS_HEADER_ROM_OFFSET) \
+		     -o $(CONFIG_CBFS_ROM_OFFSET) -s $(CONFIG_CBFS_SIZE)
 CBFSTOOL_PRE_OPTS = -b 0
 endif
 
diff --git a/src/arch/arm64/Makefile.inc b/src/arch/arm64/Makefile.inc
index f81e76a..8e88d9c 100644
--- a/src/arch/arm64/Makefile.inc
+++ b/src/arch/arm64/Makefile.inc
@@ -34,7 +34,9 @@
 ################################################################################
 
 ifeq ($(CONFIG_ARCH_ROMSTAGE_ARM64),y)
-CBFSTOOL_PRE1_OPTS = -m arm64 -b $(CONFIG_BOOTBLOCK_ROM_OFFSET) -H $(CONFIG_CBFS_HEADER_ROM_OFFSET) -o $(CONFIG_CBFS_ROM_OFFSET)
+CBFSTOOL_PRE1_OPTS = -m arm64 -b $(CONFIG_BOOTBLOCK_ROM_OFFSET) \
+		     -H $(CONFIG_CBFS_HEADER_ROM_OFFSET) \
+		     -o $(CONFIG_CBFS_ROM_OFFSET) -s $(CONFIG_CBFS_SIZE)
 endif
 
 ifeq ($(CONFIG_ARCH_ARM64),y)
diff --git a/src/arch/mips/Makefile.inc b/src/arch/mips/Makefile.inc
index 0539c4f..ee88adf 100644
--- a/src/arch/mips/Makefile.inc
+++ b/src/arch/mips/Makefile.inc
@@ -24,8 +24,9 @@
 ###############################################################################
 
 ifeq ($(CONFIG_ARCH_ROMSTAGE_MIPS),y)
-CBFSTOOL_PRE1_OPTS = -m mips -b $(CONFIG_BOOTBLOCK_ROM_OFFSET) -H $(CONFIG_CBFS_HEADER_ROM_OFFSET) -o $(CONFIG_CBFS_ROM_OFFSET)
-CBFSTOOL_PRE_OPTS = -b 0
+CBFSTOOL_PRE1_OPTS = -m mips -b $(CONFIG_BOOTBLOCK_ROM_OFFSET) \
+		     -H $(CONFIG_CBFS_HEADER_ROM_OFFSET) \
+		     -o $(CONFIG_CBFS_ROM_OFFSET) -s $(CONFIG_CBFS_SIZE)
 endif
 
 ###############################################################################
diff --git a/src/arch/riscv/Makefile.inc b/src/arch/riscv/Makefile.inc
index 7f55e1f..3bcb2ea 100644
--- a/src/arch/riscv/Makefile.inc
+++ b/src/arch/riscv/Makefile.inc
@@ -72,7 +72,7 @@
 romstage-c-ccopts += $(riscv_flags)
 romstage-S-ccopts += $(riscv_asm_flags)
 
-CBFSTOOL_PRE1_OPTS = -v -m riscv -b $(CONFIG_BOOTBLOCK_ROM_OFFSET) -H $(CONFIG_CBFS_HEADER_ROM_OFFSET) -o $(CONFIG_CBFS_ROM_OFFSET)
+CBFSTOOL_PRE1_OPTS = -v -m riscv -b $(CONFIG_BOOTBLOCK_ROM_OFFSET) -H $(CONFIG_CBFS_HEADER_ROM_OFFSET) -o $(CONFIG_CBFS_ROM_OFFSET) -s $(CONFIG_CBFS_SIZE)
 CBFSTOOL_PRE_OPTS = -v
 
 endif
diff --git a/src/arch/x86/Makefile.inc b/src/arch/x86/Makefile.inc
index 3b3d26a..a2e68cc 100644
--- a/src/arch/x86/Makefile.inc
+++ b/src/arch/x86/Makefile.inc
@@ -61,7 +61,8 @@
 mbi.bin-type := mbi
 
 ifeq ($(CONFIG_ARCH_ROMSTAGE_X86_32),y)
-CBFSTOOL_PRE1_OPTS = -m x86 -o $$(( $(CONFIG_ROM_SIZE) - $(CONFIG_CBFS_SIZE) ))
+CBFSTOOL_PRE1_OPTS = -m x86 -s $(CONFIG_ROM_SIZE) \
+		     -o $$(( $(CONFIG_ROM_SIZE) - $(CONFIG_CBFS_SIZE) ))
 # Make sure that segment for .car.data is ignored while adding romstage.
 CBFSTOOL_PRE_OPTS  = -b $(shell cat $(objcbfs)/base_xip.txt) -S ".car.data"
 endif
diff --git a/src/mainboard/google/cosmos/Kconfig b/src/mainboard/google/cosmos/Kconfig
index 0ebeae9..dc4a3b6 100644
--- a/src/mainboard/google/cosmos/Kconfig
+++ b/src/mainboard/google/cosmos/Kconfig
@@ -21,7 +21,7 @@
 
 config BOARD_SPECIFIC_OPTIONS # dummy
 	def_bool y
-	select BOARD_ROMSIZE_KB_1024
+	select BOARD_ROMSIZE_KB_2048
 	select BOARD_ID_SUPPORT
 	select CHROMEOS_VBNV_FLASH
 	select COMMON_CBFS_SPI_WRAPPER
diff --git a/src/mainboard/google/nyan/Kconfig b/src/mainboard/google/nyan/Kconfig
index 082985d..2f554ff 100644
--- a/src/mainboard/google/nyan/Kconfig
+++ b/src/mainboard/google/nyan/Kconfig
@@ -29,7 +29,7 @@
 	select TEGRA124_MODEL_CD570M
 	select MAINBOARD_HAS_BOOTBLOCK_INIT
 	select MAINBOARD_DO_NATIVE_VGA_INIT
-	select BOARD_ROMSIZE_KB_1024
+	select BOARD_ROMSIZE_KB_4096
 	select SPI_FLASH
 	select SPI_FLASH_FAST_READ_DUAL_OUTPUT_3B
 	select VIRTUAL_DEV_SWITCH
diff --git a/src/mainboard/google/nyan_big/Kconfig b/src/mainboard/google/nyan_big/Kconfig
index 22958a9..6fc618a 100644
--- a/src/mainboard/google/nyan_big/Kconfig
+++ b/src/mainboard/google/nyan_big/Kconfig
@@ -30,7 +30,7 @@
 	select TEGRA124_MODEL_CD570M
 	select MAINBOARD_HAS_BOOTBLOCK_INIT
 	select MAINBOARD_DO_NATIVE_VGA_INIT
-	select BOARD_ROMSIZE_KB_1024
+	select BOARD_ROMSIZE_KB_4096
 	select SPI_FLASH
 	select SPI_FLASH_FAST_READ_DUAL_OUTPUT_3B
 	select VIRTUAL_DEV_SWITCH
diff --git a/src/mainboard/google/nyan_blaze/Kconfig b/src/mainboard/google/nyan_blaze/Kconfig
index 0902b4f..025cc6e 100644
--- a/src/mainboard/google/nyan_blaze/Kconfig
+++ b/src/mainboard/google/nyan_blaze/Kconfig
@@ -31,7 +31,7 @@
 	select MAINBOARD_HAS_BOOTBLOCK_INIT
 	select MAINBOARD_HAS_CHROMEOS
 	select MAINBOARD_DO_NATIVE_VGA_INIT
-	select BOARD_ROMSIZE_KB_1024
+	select BOARD_ROMSIZE_KB_4096
 	select SPI_FLASH
 	select SPI_FLASH_FAST_READ_DUAL_OUTPUT_3B
 	select VIRTUAL_DEV_SWITCH
diff --git a/src/mainboard/google/rush_ryu/Kconfig b/src/mainboard/google/rush_ryu/Kconfig
index 6ba45e9..d6609e1 100644
--- a/src/mainboard/google/rush_ryu/Kconfig
+++ b/src/mainboard/google/rush_ryu/Kconfig
@@ -31,7 +31,7 @@
 	select SOC_NVIDIA_TEGRA132
 	select MAINBOARD_DO_DSI_INIT
 	select MAINBOARD_HAS_BOOTBLOCK_INIT
-	select BOARD_ROMSIZE_KB_4096
+	select BOARD_ROMSIZE_KB_8192
 	select VIRTUAL_DEV_SWITCH
 	select ARCH_SPINTABLE
 
diff --git a/src/mainboard/google/storm/Kconfig b/src/mainboard/google/storm/Kconfig
index 00405e1..29f0a73 100644
--- a/src/mainboard/google/storm/Kconfig
+++ b/src/mainboard/google/storm/Kconfig
@@ -23,7 +23,7 @@
 	def_bool y
 	select SOC_QC_IPQ806X
 	select BOARD_ID_SUPPORT
-	select BOARD_ROMSIZE_KB_4096
+	select BOARD_ROMSIZE_KB_8192
 	select COMMON_CBFS_SPI_WRAPPER
 	select HAVE_HARD_RESET
 	select MAINBOARD_HAS_BOOTBLOCK_INIT
diff --git a/src/mainboard/google/veyron_jerry/Kconfig b/src/mainboard/google/veyron_jerry/Kconfig
index 273b36e..b5aa2a4 100644
--- a/src/mainboard/google/veyron_jerry/Kconfig
+++ b/src/mainboard/google/veyron_jerry/Kconfig
@@ -29,7 +29,7 @@
 	select SOC_ROCKCHIP_RK3288
 	select MAINBOARD_DO_NATIVE_VGA_INIT
 	select MAINBOARD_HAS_CHROMEOS
-	select BOARD_ROMSIZE_KB_1024
+	select BOARD_ROMSIZE_KB_4096
 	select MAINBOARD_HAS_BOOTBLOCK_INIT
 	select HAVE_HARD_RESET
 	select RETURN_FROM_VERSTAGE
diff --git a/src/mainboard/google/veyron_mighty/Kconfig b/src/mainboard/google/veyron_mighty/Kconfig
index 9a649bd..3436f88 100644
--- a/src/mainboard/google/veyron_mighty/Kconfig
+++ b/src/mainboard/google/veyron_mighty/Kconfig
@@ -29,7 +29,7 @@
 	select SOC_ROCKCHIP_RK3288
 	select MAINBOARD_DO_NATIVE_VGA_INIT
 	select MAINBOARD_HAS_CHROMEOS
-	select BOARD_ROMSIZE_KB_1024
+	select BOARD_ROMSIZE_KB_4096
 	select MAINBOARD_HAS_BOOTBLOCK_INIT
 	select HAVE_HARD_RESET
 	select RETURN_FROM_VERSTAGE
diff --git a/src/vendorcode/google/chromeos/Kconfig b/src/vendorcode/google/chromeos/Kconfig
index 214f0ba..fa382ae 100644
--- a/src/vendorcode/google/chromeos/Kconfig
+++ b/src/vendorcode/google/chromeos/Kconfig
@@ -95,6 +95,7 @@
 	hex "Flash Map Offset"
 	default 0x00670000 if NORTHBRIDGE_INTEL_SANDYBRIDGE
 	default 0x00610000 if NORTHBRIDGE_INTEL_IVYBRIDGE
+	default CBFS_SIZE if !ARCH_X86
 	default 0
 	help
 	  Offset of flash map in firmware image