x86/x86_64/boot-options.rst

1 .. SPDX-License-Identifier: GPL-2.0
30 		Disable features for corrected errors, e.g. polling timer
39 		Do not opt-in to Local MCE delivery. Use legacy method
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.
79 	Don't use the local APIC
82      Don't use the local APIC (alias for i386 compatibility)
85 	See Documentation/arch/x86/i386/IO-APIC.rst
88 	Don't set up the APIC timer
91 	Don't check the IO-APIC timer. This can work around
92 	problems with incorrect timer initialization on some boards.
95 	Do APIC timer calibration using the pmtimer. Implies
96 	apicmaintimer. Useful when your PIT timer is totally broken.
105     Don't use the HPET timer.
150      Don't stop other CPUs on reboot. This can make reboot more reliable
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
217   pci=assign-busses
228 Multiple x86-64 PCI-DMA mapping implementations exist, for example:
232       Kernel boot message: "PCI-DMA: Disabling IOMMU"
235       Kernel boot message: "PCI-DMA: using GART IOMMU"
237    3. <arch/x86_64/kernel/pci-swiotlb.c> : Software IOMMU implementation. Used
240       Kernel boot message: "PCI-DMA: Using software bounce buffering
277       Do scatter-gather (SG) merging. Implies "force" (experimental).
279       Don't do scatter-gather (SG) merging.