x86/x86_64/boot-options.rst

1 .. SPDX-License-Identifier: GPL-2.0
39 		Do not opt-in to Local MCE delivery. Use legacy method
42 		Enable logging of machine checks left over from booting.
45 		If your BIOS doesn't do that it's a good idea to enable though
55 		Don't overwrite the bios-set CMCI threshold. This boot option
62 		Force-enable recoverable machine check code paths
73 	Use IO-APIC. Default
76 	Don't use the IO-APIC.
85 	See Documentation/arch/x86/i386/IO-APIC.rst
91 	Don't check the IO-APIC timer. This can work around
124         Use the CPU reboot vector for warm reset
132         Use the keyboard controller. cold reset (default)
135         the ACPI reset does not work, the reboot path attempts the reset
139         the EFI reset does not work, the reboot path attempts the reset using
144    Using warm reset will be much faster especially on big memory
154      There are some built-in platform specific "quirks" - you may see:
157      newer BIOS, or newer board) using this option will ignore the built-in
170     Don't parse the HMAT table for NUMA setup, or soft-reserved memory
177     Don't enable ACPI
179     Use ACPI boot table parsing, but don't enable ACPI interpreter
205   pci=assign-busses
216 Multiple x86-64 PCI-DMA mapping implementations exist, for example:
220       Kernel boot message: "PCI-DMA: Disabling IOMMU"
223       Kernel boot message: "PCI-DMA: using GART IOMMU"
225    3. <arch/x86_64/kernel/pci-swiotlb.c> : Software IOMMU implementation. Used
227       you have >3GB memory or told the kernel to us it (iommu=soft))
228       Kernel boot message: "PCI-DMA: Using software bounce buffering
246     soft
265       Do scatter-gather (SG) merging. Implies "force" (experimental).
267       Don't do scatter-gather (SG) merging.
307      Enable debug messages.