diff options
| author | Werner Zeh <werner.zeh@siemens.com> | 2022-05-20 07:02:50 +0200 |
|---|---|---|
| committer | Felix Held <felix-coreboot@felixheld.de> | 2022-05-24 13:47:56 +0000 |
| commit | 458cfaea9f9da1c9aa4c70971e607f9cbdff533f (patch) | |
| tree | 1dc27ee39d6adf7bf182130ca37c2668e7ebd976 /src | |
| parent | 859305d45762d8499b4100765d3a7bd954038c73 (diff) | |
soc/intel/apollolake: Provide FIT pointer in bootblock at build time
Before TXE releases the CPU out of reset a pointer to the constructed
FIT in SRAM is patched into the loaded bootblock at offset 4G - 64B.
Since this patched bootblock gets measured during runtime it will not
match the one that is potentially measured from the coreboot image.
This patch adds a dedicated fit.c file for Apollo Lake where the FIT
pointer is already set to the address TXE will be using at runtime.
Test=Compare sha256 sum from coreboot runtime and coreboot.rom of the
bootblock and make sure they match.
Change-Id: Ia0fd2a19517c70f50ef37e6a2dc2408bae28df10
Signed-off-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/64539
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Diffstat (limited to 'src')
| -rw-r--r-- | src/soc/intel/apollolake/Makefile.inc | 2 | ||||
| -rw-r--r-- | src/soc/intel/apollolake/bootblock/fit.c | 11 |
2 files changed, 12 insertions, 1 deletions
diff --git a/src/soc/intel/apollolake/Makefile.inc b/src/soc/intel/apollolake/Makefile.inc index a4ed87f45d..11da0b3815 100644 --- a/src/soc/intel/apollolake/Makefile.inc +++ b/src/soc/intel/apollolake/Makefile.inc @@ -155,7 +155,7 @@ endif # table + pointer, but reserving the pointer is still needed. Otherwise the # IBBL loader thrashes code there. So include fit.c so that the linker # reserves that pointer. -bootblock-y += ../../../cpu/intel/fit/fit.c +bootblock-y += bootblock/fit.c # DSP firmware settings files. ifeq ($(CONFIG_SOC_INTEL_GEMINILAKE),y) diff --git a/src/soc/intel/apollolake/bootblock/fit.c b/src/soc/intel/apollolake/bootblock/fit.c new file mode 100644 index 0000000000..0728f53cbd --- /dev/null +++ b/src/soc/intel/apollolake/bootblock/fit.c @@ -0,0 +1,11 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#include <stdint.h> + +/* + * At runtime TXE creates the FIT table in the shared SRAM and patches the bootblock + * at the fixed address 4G - 64 byte with a pointer to this FIT table. In order to be able + * to pre-compute the PCR value for the bootblock this FIT pointer needs to be added to the + * image as well. Since the FIT location is fixed in TXE, this can be done at build time. + */ +__attribute__((used, __section__(".fit_pointer"))) const uint64_t fit_ptr = 0xfffe0000; |