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Xwang

Member

From: EU

Registered: 2012-05-14

Posts: 410

What does the reboot= kernel parameter exactly do?

I'm trying to understand what the reboot kernel parameter exactly do:

Here https://www.kernel.org/doc/html/latest/ … eters.html it is written the following:

        reboot=         [KNL]
                        Format (x86 or x86_64):
                                [w[arm] | c[old] | h[ard] | s[oft] | g[pio]] \
                                [[,]s[mp]#### \
                                [[,]b[ios] | a[cpi] | k[bd] | t[riple] | e[fi] | p[ci]] \
                                [[,]f[orce]
                        Where reboot_mode is one of warm (soft) or cold (hard) or gpio
                                        (prefix with 'panic_' to set mode for panic
                                        reboot only),
                              reboot_type is one of bios, acpi, kbd, triple, efi, or pci,
                              reboot_force is either force or not specified,
                              reboot_cpu is s[mp]#### with #### being the processor
                                        to be used for rebooting.

What is the difference between warm, cold, hard, soft, gpio and so on?
What is the correct syntax to use?
Is there any more descriptive guide?

Ferdinand

Member

From: Norway

Registered: 2020-01-02

Posts: 338

Re: What does the reboot= kernel parameter exactly do?

I found a bit more info in this thread: https://forums.centos.org/viewtopic.php?t=1164

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