CBFS: Automate ROM image layout and remove hardcoded offsets

Non-x86 boards currently need to hardcode the position of their CBFS
master header in a Kconfig. This is very brittle because it is usually
put in between the bootblock and the first CBFS entry, without any
checks to guarantee that it won't overlap either of those. It is not fun
to debug random failures that move and disappear with tiny alignment
changes because someone decided to write "ORBC1112" over some part of
your data section (in a way that is not visible in the symbolized .elf
binaries, only in the final image). This patch seeks to prevent those
issues and reduce the need for manual configuration by making the image
layout a completely automated part of cbfstool.

Since automated placement of the CBFS header means we can no longer
hardcode its position into coreboot, this patch takes the existing x86
solution of placing a pointer to the header at the very end of the
CBFS-managed section of the ROM and generalizes it to all architectures.
This is now even possible with the read-only/read-write split in
ChromeOS, since coreboot knows how large that section is from the
CBFS_SIZE Kconfig (which is by default equal to ROM_SIZE, but can be
changed on systems that place other data next to coreboot/CBFS in ROM).

Also adds a feature to cbfstool that makes the -B (bootblock file name)
argument on image creation optional, since we have recently found valid
use cases for CBFS images that are not the first boot medium of the
device (instead opened by an earlier bootloader that can already
interpret CBFS) and therefore don't really need a bootblock.

BRANCH=None
BUG=None
TEST=Built and booted on Veyron_Pinky, Nyan_Blaze and Falco.

Change-Id: Ib715bb8db258e602991b34f994750a2d3e2d5adf
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: e9879c0fbd57f105254c54bacb3e592acdcad35c
Original-Change-Id: Ifcc755326832755cfbccd6f0a12104cba28a20af
Original-Signed-off-by: Julius Werner <jwerner@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/229975
Reviewed-on: http://review.coreboot.org/9620
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

4 files changed, 4 insertions, 10 deletions

diff --git a/src/arch/arm/Makefile.inc b/src/arch/arm/Makefile.inc
index cfdb5767c1..4e23f84470 100644
--- a/src/arch/arm/Makefile.inc
+++ b/src/arch/arm/Makefile.inc
@@ -31,9 +31,7 @@ subdirs-y += armv4/ armv7/
 ###############################################################################
 
 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) -s $(CONFIG_CBFS_SIZE)
+CBFSTOOL_PRE1_OPTS = -m arm -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 8e88d9c444..c9c93b17ea 100644
--- a/src/arch/arm64/Makefile.inc
+++ b/src/arch/arm64/Makefile.inc
@@ -34,9 +34,7 @@ subdirs-y += armv8/
 ################################################################################
 
 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) -s $(CONFIG_CBFS_SIZE)
+CBFSTOOL_PRE1_OPTS = -m arm64 -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 ee88adf732..1016f1f791 100644
--- a/src/arch/mips/Makefile.inc
+++ b/src/arch/mips/Makefile.inc
@@ -24,9 +24,7 @@
 ###############################################################################
 
 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) -s $(CONFIG_CBFS_SIZE)
+CBFSTOOL_PRE1_OPTS = -m mips -s $(CONFIG_CBFS_SIZE)
 endif
 
 ###############################################################################
diff --git a/src/arch/riscv/Makefile.inc b/src/arch/riscv/Makefile.inc
index 3bcb2eac2f..a0feb3d1ea 100644
--- a/src/arch/riscv/Makefile.inc
+++ b/src/arch/riscv/Makefile.inc
@@ -72,7 +72,7 @@ $(objcbfs)/romstage.debug: $$(romstage-objs)
 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) -s $(CONFIG_CBFS_SIZE)
+CBFSTOOL_PRE1_OPTS = -v -m riscv -s $(CONFIG_CBFS_SIZE)
 CBFSTOOL_PRE_OPTS = -v
 
 endif