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-rw-r--r--Documentation/x86/boot.txt3
-rw-r--r--drivers/input/serio/i8042-x86ia64io.h9
2 files changed, 11 insertions, 1 deletions
diff --git a/Documentation/x86/boot.txt b/Documentation/x86/boot.txt
index f15cb74c4f7..406d82d5d2b 100644
--- a/Documentation/x86/boot.txt
+++ b/Documentation/x86/boot.txt
@@ -373,7 +373,7 @@ Protocol: 2.00+
1 Loadlin
2 bootsect-loader (0x20, all other values reserved)
3 Syslinux
- 4 Etherboot/gPXE
+ 4 Etherboot/gPXE/iPXE
5 ELILO
7 GRUB
8 U-Boot
@@ -381,6 +381,7 @@ Protocol: 2.00+
A Gujin
B Qemu
C Arcturus Networks uCbootloader
+ D kexec-tools
E Extended (see ext_loader_type)
F Special (0xFF = undefined)
10 Reserved
diff --git a/drivers/input/serio/i8042-x86ia64io.h b/drivers/input/serio/i8042-x86ia64io.h
index d6cc77a53c7..5f306f79da0 100644
--- a/drivers/input/serio/i8042-x86ia64io.h
+++ b/drivers/input/serio/i8042-x86ia64io.h
@@ -921,6 +921,7 @@ static int __init i8042_platform_init(void)
int retval;
#ifdef CONFIG_X86
+ u8 a20_on = 0xdf;
/* Just return if pre-detection shows no i8042 controller exist */
if (!x86_platform.i8042_detect())
return -ENODEV;
@@ -960,6 +961,14 @@ static int __init i8042_platform_init(void)
if (dmi_check_system(i8042_dmi_dritek_table))
i8042_dritek = true;
+
+ /*
+ * A20 was already enabled during early kernel init. But some buggy
+ * BIOSes (in MSI Laptops) require A20 to be enabled using 8042 to
+ * resume from S3. So we do it here and hope that nothing breaks.
+ */
+ i8042_command(&a20_on, 0x10d1);
+ i8042_command(NULL, 0x00ff); /* Null command for SMM firmware */
#endif /* CONFIG_X86 */
return retval;