Aaron Durbin (adurbin@google.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/8943
-gerrit
commit 088972c2f630bc52c33904447d3eb9a0138e1141 Author: Aaron Durbin adurbin@chromium.org Date: Tue Mar 24 09:20:45 2015 -0500
coreboot: differentiate on early reliable writable globals
There is a big difference between the boards supported in coreboot and the properties they provide within each stage during the bootflow. The leads to core infrastructure relying on supporting the least common denominator when writing APIs.
Therefore, provide PLATFORM_HAS_EARLY_WRITABLE_GLOBALS which indicates that the platform has reliable writable global variables in the early stages of boot. For x86 that would be romstage, and for the other architetures which have SRAM it would encompass bootblock and romstage.
Change-Id: I2cefeaee0551ee241e138fcee0d199679002c3be Signed-off-by: Aaron Durbin adurbin@chromium.org --- src/Kconfig | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+)
diff --git a/src/Kconfig b/src/Kconfig index 7aee478..2625266 100644 --- a/src/Kconfig +++ b/src/Kconfig @@ -293,6 +293,25 @@ config SYSTEM_TYPE_LAPTOP default n bool
+config PLATFORM_HAS_EARLY_WRITABLE_GLOBALS + bool + default y if !ARCH_X86 + help + This option signals to the rest of the infrastructure that + the platform supports writable globals in bootblock and + romstage. Fox traditional x86 systems without any SRAM this + would mean cache-as-ram globals are migrated correctly from + the CAR area once memory is trained. After the migration the + variables are accessible using the CAR API. This behavior + puts such x86 systems on par with ARM and MIPS systems. + +config PLATFORM_NO_EARLY_WRITABLE_GLOBALS + bool + default y if !PLATFORM_HAS_EARLY_WRITABLE_GLOBALS + help + This is just the opposite of PLATFORM_HAS_EARLY_WRITABLE_GLOBALS + to enable cleaner Makefiles. + menu "Chipset"
comment "CPU"