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-rw-r--r--Documentation/x86_64/boot-options.txt5
1 files changed, 4 insertions, 1 deletions
diff --git a/Documentation/x86_64/boot-options.txt b/Documentation/x86_64/boot-options.txt
index 945311840a10..d7a333258682 100644
--- a/Documentation/x86_64/boot-options.txt
+++ b/Documentation/x86_64/boot-options.txt
@@ -110,12 +110,15 @@ Idle loop
Rebooting
- reboot=b[ios] | t[riple] | k[bd] [, [w]arm | [c]old]
+ reboot=b[ios] | t[riple] | k[bd] | a[cpi] [, [w]arm | [c]old]
bios Use the CPU reboot vector for warm reset
warm Don't set the cold reboot flag
cold Set the cold reboot flag
triple Force a triple fault (init)
kbd Use the keyboard controller. cold reset (default)
+ acpi Use the ACPI RESET_REG in the FADT. If ACPI is not configured or the
+ ACPI reset does not work, the reboot path attempts the reset using
+ the keyboard controller.
Using warm reset will be much faster especially on big memory
systems because the BIOS will not go through the memory check.