U-Boot itself as well as everything that is consumed by U-Boot (like
heap, stack, dtb, etc) needs to be reserved and reported in the E820
table when S3 resume is on.
Signed-off-by: Bin Meng <bmeng...@gmail.com>
Reviewed-by: Simon Glass <s...@chromium.org>
---
Changes in v2: None
arch/x86/Kconfig | 8 ++++++++
arch/x86/lib/fsp/fsp_dram.c | 12 ++++++++++++
2 files changed, 20 insertions(+)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index b568852..5322eff 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -601,6 +601,14 @@ config HAVE_ACPI_RESUME
is done, U-Boot needs to find out the wakeup vector provided by OSes
and jump there.
+config STACK_SIZE
+ hex
+ depends on HAVE_ACPI_RESUME
+ default 0x1000
+ help
+ Estimated U-Boot's runtime stack size that needs to be reserved
+ during an ACPI S3 resume.
+
config MAX_PIRQ_LINKS
int
default 8
diff --git a/arch/x86/lib/fsp/fsp_dram.c b/arch/x86/lib/fsp/fsp_dram.c
index 8b880cd..1a7af57 100644
--- a/arch/x86/lib/fsp/fsp_dram.c
+++ b/arch/x86/lib/fsp/fsp_dram.c
@@ -92,5 +92,17 @@ unsigned install_e820_map(unsigned max_entries, struct
e820entry *entries)
entries[num_entries].type = E820_RESERVED;
num_entries++;
+#ifdef CONFIG_HAVE_ACPI_RESUME
+ /*
+ * Everything between U-Boot's stack and ram top needs to be
+ * reserved in order for ACPI S3 resume to work.
+ */
+ entries[num_entries].addr = gd->start_addr_sp - CONFIG_STACK_SIZE;
+ entries[num_entries].size = gd->ram_top - gd->start_addr_sp + \
+ CONFIG_STACK_SIZE;
+ entries[num_entries].type = E820_RESERVED;
+ num_entries++;
+#endif
+
return num_entries;
}
--
2.9.2
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