Mark the first 64K memory as reserved as well since U-Boot uses this
memory region for things like VBIOS execution in real mode. After
kernel resumes, it checks low memory range per config option
CONFIG_X86_RESERVE_LOW which is 64K by default to see whether a
memory corruption occurs during the suspend/resume.
Signed-off-by: Bin Meng <bmeng...@gmail.com>
---
arch/x86/lib/fsp/fsp_dram.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/arch/x86/lib/fsp/fsp_dram.c b/arch/x86/lib/fsp/fsp_dram.c
index 417c611..2b383ef 100644
--- a/arch/x86/lib/fsp/fsp_dram.c
+++ b/arch/x86/lib/fsp/fsp_dram.c
@@ -100,6 +100,18 @@ unsigned install_e820_map(unsigned max_entries, struct
e820entry *entries)
CONFIG_STACK_SIZE;
entries[num_entries].type = E820_RESERVED;
num_entries++;
+
+ /*
+ * Mark the first 64K memory as reserved as well since U-Boot uses
+ * this memory region for things like VBIOS execution in real mode.
+ * After kernel resumes, it checks low memory range per config option
+ * CONFIG_X86_RESERVE_LOW which is 64K by default to see whether a
+ * memory corruption occurs during the suspend/resume.
+ */
+ entries[num_entries].addr = 0;
+ entries[num_entries].size = 0x10000;
+ entries[num_entries].type = E820_RESERVED;
+ num_entries++;
#endif
return num_entries;
--
2.9.2
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