nb/intel/haswell: Add an option for where verstage starts
Previously Haswell used a romcc bootblock and starting verstage in
romstage was madatory but with C_ENVIRONMENT_BOOTBLOCK it is also
possible to have a separate verstage.
This selects using a separate verstage by default but still keeps the
option around to use verstage in romstage.
Also make sure mrc.bin is only added to the COREBOOT fmap region as it
requires to be run at a specific offset. This means that coreboot will
have to jump from a RW region to the RO region for that binary and
back to that RW region after that binary is done initializing the
memory.
Change-Id: I3b7b29f4a24c0fb830ff76fe31a35b6afcae4e67
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/26926
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/northbridge/intel/haswell/Kconfig b/src/northbridge/intel/haswell/Kconfig
index 242ab18..e0c55d2 100644
--- a/src/northbridge/intel/haswell/Kconfig
+++ b/src/northbridge/intel/haswell/Kconfig
@@ -27,9 +27,25 @@
if NORTHBRIDGE_INTEL_HASWELL
+config HASWELL_VBOOT_IN_BOOTBLOCK
+ depends on VBOOT
+ bool "Start verstage in bootblock"
+ default y
+ select VBOOT_STARTS_IN_BOOTBLOCK
+ select VBOOT_SEPARATE_VERSTAGE
+ help
+ Haswell can either start verstage in a separate stage
+ right after the bootblock has run or it can start it
+ after romstage for compatibility reasons.
+ Haswell however uses a mrc.bin to initialse memory which
+ needs to be located at a fixed offset. Therefore even with
+ a separate verstage starting after the bootblock that same
+ binary is used meaning a jump is made from RW to the RO region
+ and back to the RW region after the binary is done.
+
config VBOOT
select VBOOT_OPROM_MATTERS
- select VBOOT_STARTS_IN_ROMSTAGE
+ select VBOOT_STARTS_IN_ROMSTAGE if !HASWELL_VBOOT_IN_BOOTBLOCK
config VGA_BIOS_ID
string
@@ -93,4 +109,11 @@
VBIOS. On those systems we need to wait for a bit before executing
the VBIOS.
+# The UEFI System Agent binary needs to be at a fixed offset in the flash
+# and can therefore only reside in the COREBOOT fmap region
+config RO_REGION_ONLY
+ string
+ depends on VBOOT
+ default "mrc.bin"
+
endif