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x86/reboot: Document the "reboot=pci" option

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It is mentioned in the top level non-arch specific file but it was
overlooked here for x86.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20210530162447.996461-2-paul.gortmaker@windriver.com
This commit is contained in:
Paul Gortmaker 2021-05-30 12:24:45 -04:00 committed by Thomas Gleixner
parent 36a21d5172
commit 162a5284fa
1 changed files with 3 additions and 1 deletions
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4
Documentation/x86/x86_64/boot-options.rst
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@ -126,7 +126,7 @@ Idle loop
Rebooting
=========
reboot=b[ios] | t[riple] | k[bd] | a[cpi] | e[fi] [, [w]arm | [c]old]
reboot=b[ios] | t[riple] | k[bd] | a[cpi] | e[fi] | p[ci] [, [w]arm | [c]old]
bios
Use the CPU reboot vector for warm reset
warm
@ -145,6 +145,8 @@ Rebooting
Use efi reset_system runtime service. If EFI is not configured or
the EFI reset does not work, the reboot path attempts the reset using
the keyboard controller.
pci
Use a write to the PCI config space register 0xcf9 to trigger reboot.
Using warm reset will be much faster especially on big memory
systems because the BIOS will not go through the memory check.