Arthur Heymans (arthur@aheymans.xyz) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/18148
-gerrit
commit 2a6158b76d962a9cbb03c39b4d019dd86bb88bb3 Author: Arthur Heymans arthur@aheymans.xyz Date: Sun Jan 15 14:24:56 2017 +0100
[RFC] Allow to add a second bootblock at a 64K offset for BUC.TS
This allows to add a second bootblock at an offset of 64K in order for it to be used if the BUC.TS bit, RCBA(0x3414)[BITO], is set.
This method is often used to flash coreboot when the vendor BIOS only write protects its bootblock at the bottom of flash (e.g. Lenovo thinkpad X60 and T60), but can also be used to have a backup while hacking on bootblock code.
TESTED on Thinkpad x200 with BIT0 of RCBA(0x3410) unset (not default in coreboot).
Some questions, remarks: - How to do this with cbfstool could also simply be documented instead of integrated in the build system; - Is this Makefile code a good way to achieve this? - Kconfig: Should this be board specific instead of southbridge specific, since it is mainly aimed at flashing coreboot from vendor BIOS? It really depends on the vendor BIOS bootblock if this Backed Up Control Top Swap trick works.
Change-Id: I37e288e710edbe41651d09d2a6981a571df69bde Signed-off-by: Arthur Heymans arthur@aheymans.xyz --- Makefile.inc | 7 +++++++ src/southbridge/intel/common/Kconfig | 18 ++++++++++++++++++ src/southbridge/intel/i82801gx/Kconfig | 1 + src/southbridge/intel/i82801ix/Kconfig | 1 + 4 files changed, 27 insertions(+)
diff --git a/Makefile.inc b/Makefile.inc index c5ce30f..01c0869 100644 --- a/Makefile.inc +++ b/Makefile.inc @@ -844,6 +844,13 @@ ifeq ($(CONFIG_ARCH_X86),y) -n bootblock \ -t bootblock \ -b -$(call file-size,$(objcbfs)/bootblock.bin) $(cbfs-autogen-attributes) +ifeq ($(CONFIG_BUCTS_BOOTBLOCK),y) + $(CBFSTOOL) $@.tmp add \ + -f $(objcbfs)/bootblock.bin \ + -n bootblock_bucts \ + -t bootblock \ + -b -$(call int-add,$(call file-size,$(objcbfs)/bootblock.bin) $(CONFIG_BOOTBLOCK_SIZE)) $(cbfs-autogen-attributes) +endif # ifeq CONFIG_BUCTS_BOOTBLOCK else # ifeq ($(CONFIG_ARCH_X86),y) $(CBFSTOOL) $@.tmp write -u \ -r BOOTBLOCK \ diff --git a/src/southbridge/intel/common/Kconfig b/src/southbridge/intel/common/Kconfig index 7bc686d..12d84af 100644 --- a/src/southbridge/intel/common/Kconfig +++ b/src/southbridge/intel/common/Kconfig @@ -2,3 +2,21 @@ config SOUTHBRIDGE_INTEL_COMMON def_bool n config SOUTHBRIDGE_INTEL_COMMON_GPIO def_bool n +config HAVE_BUCTS + bool + default n +config BUCTS_BOOTBLOCK + bool "Include a BUC.TS bootblock" + default n + depends on HAVE_BUCTS + help + Some vendor BIOS only write protect their bootblock. + Using the buc.ts register RCBA[0x3414], it is possible to have + the southbridge look for the bootblock at a 64K offset + instead of the usual top of flash, which might not be + write protected. + Select this to put a 'second' bootblock at a 64K offset. +config BOOTBLOCK_SIZE + hex + depends on BUCTS_BOOTBLOCK + default 0x10000 \ No newline at end of file diff --git a/src/southbridge/intel/i82801gx/Kconfig b/src/southbridge/intel/i82801gx/Kconfig index b2265c4..4eb2835 100644 --- a/src/southbridge/intel/i82801gx/Kconfig +++ b/src/southbridge/intel/i82801gx/Kconfig @@ -24,6 +24,7 @@ config SOUTHBRIDGE_INTEL_I82801GX select HAVE_SMI_HANDLER select COMMON_FADT select SOUTHBRIDGE_INTEL_COMMON_GPIO + select HAVE_BUCTS
if SOUTHBRIDGE_INTEL_I82801GX
diff --git a/src/southbridge/intel/i82801ix/Kconfig b/src/southbridge/intel/i82801ix/Kconfig index e4d1f91..0928a8a 100644 --- a/src/southbridge/intel/i82801ix/Kconfig +++ b/src/southbridge/intel/i82801ix/Kconfig @@ -25,6 +25,7 @@ config SOUTHBRIDGE_INTEL_I82801IX select HAVE_USBDEBUG_OPTIONS select SOUTHBRIDGE_INTEL_COMMON_GPIO select HAVE_INTEL_FIRMWARE + select HAVE_BUCTS
if SOUTHBRIDGE_INTEL_I82801IX