CBMEM: Backup top_of_ram instead of cbmem_toc
AMD northbridges have a complex way to resolve top_of_ram.
Once it is resolved, it is stored in NVRAM to be used on resume.
TODO: Redesign these get_top_of_ram() functions from scratch.
Change-Id: I3cceb7e9b8b07620dacf138e99f98dc818c65341
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/3557
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@google.com>
diff --git a/src/arch/x86/boot/cbmem.c b/src/arch/x86/boot/cbmem.c
index 333ca55..991a3e6 100644
--- a/src/arch/x86/boot/cbmem.c
+++ b/src/arch/x86/boot/cbmem.c
@@ -40,12 +40,18 @@
#endif
#if !CONFIG_DYNAMIC_CBMEM && !defined(__PRE_RAM__)
+void __attribute__((weak)) backup_top_of_ram(uint64_t ramtop)
+{
+ /* Do nothing. Chipset may have implementation to save ramtop in NVRAM. */
+}
+
/* This is for compatibility with old boards only. Any new chipset and board
* must implement get_top_of_ram() for both romstage and ramstage to support
* features like CAR_MIGRATION and CBMEM_CONSOLE.
*/
void set_top_of_ram(uint64_t ramtop)
{
+ backup_top_of_ram(ramtop);
cbmem_late_set_table(ramtop - HIGH_MEMORY_SIZE, HIGH_MEMORY_SIZE);
}
#endif