Lines Matching +full:i2c +full:- +full:alias +full:- +full:pool
5 force -- enable ACPI if default was off
6 on -- enable ACPI but allow fallback to DT [arm64]
7 off -- disable ACPI if default was on
8 noirq -- do not use ACPI for IRQ routing
9 strict -- Be less tolerant of platforms that are not
11 rsdt -- prefer RSDT over (default) XSDT
12 copy_dsdt -- copy DSDT to memory
26 If set to vendor, prefer vendor-specific driver
58 Documentation/firmware-guide/acpi/debug.rst for more information about
121 Disable auto-serialization of AML methods
124 auto-serialization feature.
142 Ignore the ACPI-based watchdog interface (WDAT) and let
163 acpi_osi=! # disable all built-in OS vendor
165 acpi_osi=!! # enable all built-in OS vendor
227 For broken nForce2 BIOS resulting in XT-PIC timer.
235 as soon as the kernel's real-mode entry point is called.
265 See Documentation/sound/alsa-configuration.rst
272 align_va_addr= [X86-64]
277 CPU-intensive style benchmark, and it can vary highly in
280 32: only for 32-bit processes
281 64: only for 64-bit processes
282 on: enable for both 32- and 64-bit processes
283 off: disable for both 32- and 64-bit processes
292 amd_iommu= [HW,X86-64]
295 fullflush - enable flushing of IO/TLB entries when
299 off - do not initialize any AMD IOMMU found in
301 force_isolation - Force device isolation for all
307 amd_iommu_dump= [HW,X86-64]
313 amd_iommu_intr= [HW,X86-64]
316 legacy - Use legacy interrupt remapping mode.
317 vapic - Use virtual APIC mode, which allows IOMMU
319 This mode requires kvm-amd.avic=1.
333 Power management functions (SPARCstation-4/5 + deriv.)
335 Disable APC CPU standby support. SPARCstation-Fox does
336 not play well with APC CPU idle - disable it if you have
343 when initialising the APIC and IO-APIC components.
344 For X86-32, this can also be used to specify an APIC
364 to set it to "all" by meaning -- no limit here.
373 arcrimi= [HW,NET] ARCnet - "RIM I" (entirely mem-mapped) cards
397 audit= [KNL] Enable the audit sub-system
399 0 | off - kernel audit is disabled and can not be
401 unset - kernel audit is initialized but disabled and
403 1 | on - kernel audit is initialized and partially
416 0 - Disable the BAU.
417 1 - Enable the BAU.
418 unset - Disable the BAU.
439 See Documentation/block/cmdline-partition.rst
450 See Documentation/admin-guide/bootconfig.rst
461 bttv.pll= See Documentation/admin-guide/media/bttv.rst
470 cachesize= [BUGS=X86-32] Override level 2 CPU cache size detection.
489 inclusive. See arch/mips/include/asm/pgtable-bits.h
499 - foo isn't auto-mounted if you mount all cgroups in
501 - foo isn't visible as an individually mountable
518 nosocket -- Disable socket memory accounting.
519 nokmem -- Disable kernel memory accounting.
520 kmem -- Enable kernel memory accounting.
525 0 -- check protection applied by kernel (includes
527 1 -- check protection requested by application.
541 force such clocks to be always-on nor does it reserve
545 information, see Documentation/driver-api/clk.rst.
547 clock= [BUGS=X86-32, HW] gettimeofday clocksource override.
564 [X86-32] pit,hpet,tsc;
571 [X86-64] hpet,tsc
577 architected timer so that code using WFE-based polling
600 cma=nn[MG]@[start[MG][-end[MG]]]
611 Sets the size of kernel per-numa memory area for
613 per-numa CMA altogether. And If this option is not
615 With per-numa CMA enabled, DMA users on node nid will
628 Sets the size of memory pool for coherent, atomic dma
631 com20020= [HW,NET] ARCnet - COM20020 chipset
635 com90io= [HW,NET] ARCnet - COM90xx chipset (IO-mapped buffers)
639 ARCnet - COM90xx chipset (memory-mapped buffers)
657 See Documentation/admin-guide/serial-console.rst for more
667 Start an early, polled-mode console on the 8250/16550
670 MMIO inter-register address stride is either 8-bit
671 (mmio), 16-bit (mmio16), or 32-bit (mmio32).
675 the h/w is not re-initialized.
696 syscall, or to executing "dmesg -S --raw" or to reading
716 disable the cpuidle sub-system
722 disable the cpufreq sub-system
730 [X86] Delay for N microsec between assert and de-assert
745 [KNL, X86-64] Select a region under 4G first, and
748 See Documentation/admin-guide/kdump/kdump.rst for further details.
753 start-[end] where start and end are both
755 Documentation/admin-guide/kdump/kdump.rst for an example.
758 [KNL, X86-64] range could be above 4G. Allow kernel
765 [KNL, X86-64] range under 4G. When crashkernel=X,high
770 low memory is needed to make sure DMA buffers for 32-bit
780 [KNL] Disable crypto self-tests
794 See also Documentation/input/devices/joystick-parport.rst
798 Documentation/admin-guide/dynamic-debug-howto.rst for
812 [KNL] verbose self-tests
815 self-tests.
817 1 will print _a lot_ more information - normally
855 Format: { on, no-mount, off }
857 no-mount:
862 get a -EPERM as result when trying to register files
866 Default value is set in build-time with a kernel configuration.
878 Documentation/admin-guide/mm/hugetlbpage.rst.
925 against bounds-checking flaws in the kernel's
970 memory out of your available memory pool based on
985 entries for DMA-API debugging code. One entry is
986 required per DMA-API allocation. Use this if the
987 DMA-API debugging code disables itself because the
991 With this option the DMA-API debugging driver
1015 Documentation/admin-guide/hw-vuln/reg-file-data-sampling.rst
1026 Generic built-in EDID data sets are used, if one of
1031 available in Documentation/admin-guide/edid.rst. An EDID
1043 Control how the dt_cpu_ftrs device-tree binding is
1053 what data is available or for reverse-engineering.
1058 Documentation/admin-guide/dynamic-debug-howto.rst
1075 determined by stdout-path property in device tree's
1080 Start an early, polled-mode console on a Cadence
1091 Start an early, polled-mode console on the 8250/16550
1093 MMIO inter-register address stride is either 8-bit
1094 (mmio) or 32-bit (mmio32 or mmio32be).
1102 Start an early, polled-mode console on a pl011 serial
1106 the driver will use only 32-bit accessors to read/write
1110 Start an early, polled-mode console on a meson serial
1116 Start an early, polled-mode console on an msm serial
1122 Start an early, polled-mode console on an msm serial
1128 Start an early, polled-mode console on a serial port
1134 Start an early, polled-mode console on a serial port
1140 Use RISC-V SBI (Supervisor Binary Interface) for early
1158 Start an early, polled-mode console on a lantiq serial
1172 Start an early, polled-mode, output-only console on the
1177 Start an early, polled-mode console on the
1183 Start an early, polled-mode console on a Qualcomm
1191 coherent non-x86 systems that use system memory for
1302 attribute is added to range 0x100000000-0x180000000 and
1303 0x10a0000000-0x1120000000.
1307 range 0x240000000-0x43fffffff.
1319 Documentation/admin-guide/acpi/ssdt-overlays.rst for details.
1325 elanfreq= [X86-32]
1333 See Documentation/admin-guide/kdump/kdump.rst for details.
1349 0 -- permissive (log only, no denials).
1350 1 -- enforcing (deny and log).
1374 See also Documentation/fault-injection/.
1378 See Documentation/admin-guide/sysctl/net.rst for
1382 See Documentation/admin-guide/blockdev/floppy.rst.
1385 [IA-64] Avoid check_sal_cache_flush which may hang on
1390 forcepae [X86-32]
1409 ftrace_filter=[function-list]
1411 tracer at boot up. function-list is a comma separated
1416 ftrace_notrace=[function-list]
1418 function-list. This list can be changed at run time
1422 ftrace_graph_filter=[function-list]
1425 function-list is a comma separated list of functions
1429 ftrace_graph_notrace=[function-list]
1431 function-list. This list is a comma separated list of
1451 off -- Don't create device links from firmware info.
1452 permissive -- Create device links from firmware info
1455 on -- Create device links from firmware info and use it
1457 rpm -- Like "on", but also use to order runtime PM.
1463 See also Documentation/input/devices/joystick-parport.rst
1467 gart_fix_e820= [X86-64] disable the fix e820 for K8 GART
1491 gcov_persist= [GCOV] When non-zero (default), profiling data for
1524 gpio-mockup.gpio_mockup_ranges
1529 [KNL] Should the hard-lockup detector generate
1535 for 64-bit NUMA, off otherwise.
1538 hcl= [IA-64] SGI's Hardware Graph compatibility layer
1545 corresponding firmware-first mode error processing
1559 hpet= [X86-32,HPET] option to control HPET usage
1576 boot-time allocation of gigantic hugepages is skipped.
1584 Documentation/admin-guide/mm/hugetlbpage.rst.
1594 Documentation/admin-guide/mm/hugetlbpage.rst.
1603 by the CONFIG_BOOTPARAM_HUNG_TASK_PANIC build-time
1609 hvc_iucv_allow= [S390] Comma-separated list of z/VM user IDs.
1623 i2c_bus= [HW] Override the default board specific I2C bus speed
1624 or register an additional I2C bus that is not
1632 (disabled by default, and as a pre-condition
1634 i8042.direct [HW] Put keyboard port into non-translated mode
1648 suspend-to-ram transitions, only during s2r
1683 -1 -- never invert brightness
1684 0 -- machine default
1685 1 -- force brightness inversion
1690 ide-core.nodma= [HW] (E)IDE subsystem
1696 ide-generic.probe-mask= [HW] (E)IDE subsystem
1708 ide-pci-generic.all-generic-ide [HW] (E)IDE subsystem
1719 idle=nomwait: Disable mwait for CPU C-states
1736 legacy only accept legacy-NaN binaries, if supported
1738 2008 only accept 2008-NaN binaries, if supported
1747 'relaxed' straps the emulator for both legacy-NaN and
1748 2008-NaN, whereas 'strict' enables legacy-NaN only on
1757 Ignore loglevel setting - this will print /all/
1821 Formats: { "ima" | "ima-ng" | "ima-sig" }
1822 Default: "ima-ng"
1854 initcall_blacklist= [KNL] Do not execute a comma-separated list of
1855 initcall functions. Useful for debugging built-in
1888 0 -- basic integrity auditing messages. (Default)
1889 1 -- additional integrity auditing messages.
1902 forcedac [X86-64]
1904 for io virtual address below 32-bit forcing dual
1906 than 32-bit addressing. The default is to look
1907 for translation below 32-bit and if not available
1925 could harm performance of some high-throughput
1939 1 to 9 specify maximum depth of C-state.
1949 used along with the hardware-managed P-states (HWP)
1953 in favor of acpi-cpufreq. Forcing the intel_pstate driver
1954 instead of acpi-cpufreq may disable platform features, such
1956 P-States information being indicated to OSPM and therefore
1959 or on platforms that use pcc-cpufreq instead of acpi-cpufreq.
1972 Allow per-logical-CPU P-State performance control limits using
1975 intremap= [X86-64, Intel-IOMMU]
1980 BIOS x2APIC opt-out request will be ignored
2004 0 - Lazy mode.
2010 1 - Strict mode (default).
2017 0 - Use IOMMU translation for DMA.
2018 1 - Bypass the IOMMU for DMA.
2019 unset - Use value of CONFIG_IOMMU_DEFAULT_PASSTHROUGH.
2021 io7= [HW] IO7 for Marvel-based Alpha systems
2036 See Documentation/admin-guide/nfs/nfsroot.rst.
2060 Enables support for pseudo-NMIs in the kernel. This
2079 [Deprecated - use cpusets instead]
2080 Format: [flag-list,]<cpu-list>
2111 "number of CPUs in system - 1".
2137 The format of <cpu-list> is described above.
2141 ivrs_ioapic [HW,X86-64]
2142 Provide an override to the IOAPIC-ID<->DEVICE-ID
2146 For example, to map IOAPIC-ID decimal 10 to
2152 * To map IOAPIC-ID decimal 10 to PCI device 00:14.0
2155 * To map IOAPIC-ID decimal 10 to PCI segment 0x1 and
2159 ivrs_hpet [HW,X86-64]
2160 Provide an override to the HPET-ID<->DEVICE-ID
2164 For example, to map HPET-ID decimal 10 to
2170 * To map HPET-ID decimal 0 to PCI device 00:14.0
2173 * To map HPET-ID decimal 10 to PCI segment 0x1 and
2177 ivrs_acpihid [HW,X86-64]
2178 Provide an override to the ACPI-HID:UID<->DEVICE-ID
2182 For example, to map UART-HID:UID AMD0020:0 to
2188 * To map UART-HID:UID AMD0020:0 to PCI segment is 0,
2191 * To map UART-HID:UID AMD0020:0 to PCI segment 0x1 and
2211 kernelcore= [KNL,X86,IA-64,PPC]
2214 the kernel for non-movable allocations. The requested
2224 subsystem. Note that allocations like PTEs-from-HighMem
2232 for non-movable allocations and remaining memory is used
2243 gdb or control-c on the dbgp connection. When
2244 not using this parameter you use sysrq-g to break into
2249 or a supported polling keyboard driver (non-usb).
2276 Configure the RouterBoard 532 series on-chip
2279 kmemleak= [KNL] Boot-time kmemleak enable/disable
2285 kprobe_event=[probe-list]
2287 The probe-list is a semicolon delimited list of probe
2333 kvm-amd.nested= [KVM,AMD] Allow nested virtualization in KVM/SVM.
2336 kvm-amd.npt= [KVM,AMD] Disable nested paging (virtualized MMU)
2338 Default is 1 (enabled) if in 64-bit or 32-bit PAE mode.
2340 kvm-arm.vgic_v3_group0_trap=
2341 [KVM,ARM] Trap guest accesses to GICv3 group-0
2344 kvm-arm.vgic_v3_group1_trap=
2345 [KVM,ARM] Trap guest accesses to GICv3 group-1
2348 kvm-arm.vgic_v3_common_trap=
2352 kvm-arm.vgic_v4_enable=
2364 kvm-intel.ept= [KVM,Intel] Disable extended page tables
2368 kvm-intel.emulate_invalid_guest_state=
2370 Ignored if kvm-intel.enable_unrestricted_guest=1, as
2376 kvm-intel.flexpriority=
2380 kvm-intel.nested=
2384 kvm-intel.unrestricted_guest=
2389 kvm-intel.vmentry_l1d_flush=[KVM,Intel] Mitigation for L1 Terminal Fault
2390 CVE-2018-3620.
2401 kvm-intel.vpid= [KVM,Intel] Disable Virtual Processor Identification
2468 For details see: Documentation/admin-guide/hw-vuln/l1tf.rst
2474 lapic [X86-32,APIC] Enable the local APIC even if BIOS
2478 value for LAPIC timer one-shot implementation. Default
2513 first fan-out link behind PMP device. It does not
2527 * Transfer mode: pio[0-7], mwdma[0-4] and udma[0-7].
2539 hot-unplug link recovery
2576 Set the number of locking read-acquisition kthreads.
2581 Set the number of locking write-acquisition kthreads.
2584 Set time (s) after boot for CPU-hotplug testing.
2587 Set time (s) between CPU-hotplug operations, or
2588 zero to disable CPU-hotplug testing.
2591 Set task-shuffle interval (jiffies). Shuffling
2592 tasks allows some CPUs to go into dyntick-idle
2597 is useful for hands-off automated testing.
2630 7 (KERN_DEBUG) debug-level messages
2640 logo.nologo [FB] Disables display of the built-in Linux logo.
2658 an IEEE 1284-compliant printer is attached; if
2664 time-consuming boot-time autodetection (up to 250 ms per
2685 machvec= [IA-64] Force the use of a particular machine-vector
2691 Example: machtype=lemote-yeeloong-2f-7inch
2706 (loop.max_loop) unconditionally pre-created at init time. The default
2709 devices can be requested on-demand with the
2710 /dev/loop-control interface.
2712 mce [X86-32] Machine Check Exception
2714 mce=option [X86-64] See Documentation/x86/x86_64/boot-options.rst
2717 See Documentation/admin-guide/md.rst.
2724 Control mitigation for the Micro-architectural Data
2739 full - Enable MDS mitigation on vulnerable CPUs
2740 full,nosmt - Enable MDS mitigation and disable
2742 off - Unconditionally disable MDS mitigation
2744 On TAA-affected machines, mds=off can be prevented by
2753 For details see: Documentation/admin-guide/hw-vuln/mds.rst
2772 mem=nopentium [BUGS=X86-32] Disable usage of 4MB pages for kernel
2777 per-device physically contiguous DMA buffers.
2785 See Documentation/admin-guide/mm/memory-hotplug.rst.
2810 Example: Exclude memory from 0x18690000-0x1869ffff
2824 memmap=<size>%<offset>-<oldtype>+<newtype>
2826 from <oldtype> to <newtype>. If "-<oldtype>" is left
2841 repeatable BIOS-originated corruption always
2866 mem_encrypt= [X86-64] AMD Secure Memory Encryption (SME) control
2874 Refer to Documentation/virt/kvm/amd-memory-encryption.rst
2878 s2idle - Suspend-To-Idle
2879 shallow - Power-On Suspend or equivalent (if supported)
2880 deep - Suspend-To-RAM or equivalent (if supported)
2881 See Documentation/admin-guide/pm/sleep-states.rst.
2884 See Documentation/admin-guide/media/meye.rst.
2886 mfgpt_irq= [IA-32] Specify the IRQ to use for the
2887 Multi-Function General Purpose Timers on AMD Geode
2890 mfgptfix [X86-32] Fix MFGPT timers on AMD Geode platforms when
2904 0 - The attached screen is the 3.5" TFT
2905 1 - The attached screen is the 7" TFT
2906 2 - The VGA Shield is attached (1024x768)
2910 b - Enable backlight. The TFT backlight pin will be
2914 c - Enable the s3c camera interface.
2915 t - Reserved for enabling touchscreen support. The
2919 https://repo.or.cz/w/linux-2.6/mini2440.git
2924 arch-independent options, each of which is an
2925 aggregation of existing arch-specific options.
2947 ssbd=force-off [ARM64]
2960 have other ways of avoiding SMT-based attacks.
2995 full - Enable mitigation on vulnerable CPUs
2997 full,nosmt - Enable mitigation and disable SMT on
3000 off - Unconditionally disable mitigation
3013 Documentation/admin-guide/hw-vuln/processor_mmio_stale_data.rst
3021 module_blacklist= [KNL] Do not load a comma-separated list of
3035 movablecore= [KNL,X86,IA-64,PPC]
3046 movable_node [KNL] Boot-time switch to make hotplugable memory
3053 Format: <name>,<region-number>,<size>,<offset>
3056 <name>,<region-number>[,<base>,<size>,<buswidth>,<altbuswidth>]
3065 onenand.bdry= [HW,MTD] Flex-OneNAND Boundary Configuration
3069 boundary - index of last SLC block on Flex-OneNAND.
3071 lock - Configure if Flex-OneNAND boundary should be locked.
3078 See arch/arm/mach-s3c2412/mach-jive.c
3106 something different and driver-specific.
3117 See Documentation/admin-guide/nfs/nfsroot.rst.
3119 nfsroot= [NFS] nfs root filesystem for disk-less boxes.
3120 See Documentation/admin-guide/nfs/nfsroot.rst.
3123 See Documentation/admin-guide/nfs/nfsroot.rst.
3147 [NFS] enable 64-bit inode numbers.
3148 If zero, the NFS client will fake up a 32-bit inode
3150 of returning the full 64-bit number.
3151 The default is to return 64-bit inode numbers.
3181 [NFS4] Specify an additional fixed unique ident-
3212 driver. A non-zero value sets the minimum interval
3224 NMI stack-backtrace request.
3233 0 - turn hardlockup detector in nmi_watchdog off
3234 1 - turn hardlockup detector in nmi_watchdog on
3251 no387 [BUGS=X86-32] Tells the kernel to use the 387 maths
3255 no5lvl [X86-64] Disable 5-level paging mode. Forces
3256 kernel to use 4-level paging instead.
3287 caches in the slab allocator. Saves per-node memory,
3307 nodelayacct [KNL] Disable per-task delay accounting
3313 no_entry_flush [PPC] Don't flush the L1-D cache when entering the kernel.
3315 noexec [IA-64]
3318 On X86-32 available only on PAE configured kernels.
3319 noexec=on: enable non-executable mappings (default)
3320 noexec=off: disable non-executable mappings
3330 noexec32 [X86-64]
3331 This affects only 32-bit executables.
3332 noexec32=on: enable non-executable mappings (default)
3334 noexec32=off: disable non-executable mappings
3339 nofxsr [BUGS=X86-32] Disables x86 floating point extended
3341 legacy floating-point registers on task switch.
3365 [PPC] Don't flush the L1-D cache after accessing user data.
3369 enabling legacy floating-point and sse state.
3394 nohalt [IA-64] Tells the kernel not to use the power saving
3396 power-consumption. On the positive side, it reduces
3397 interrupt wake-up latency, which may improve performance
3399 real-time systems.
3419 noirqdebug [X86-32] Disables the code which attempts to detect and
3430 nointremap [X86-64, Intel-IOMMU] Do not enable interrupt
3432 [Deprecated - use intremap=off]
3434 nointroute [IA-64]
3438 nojitter [IA-64] Disables jitter checking for ITC timers.
3440 no-kvmclock [X86,KVM] Disable paravirtualized KVM clock driver
3442 no-kvmapf [X86,KVM] Disable paravirtualized asynchronous page
3445 no-vmw-sched-clock
3449 no-steal-acc [X86,PV_OPS,ARM64] Disable paravirtualized steal time
3453 nolapic [X86-32,APIC] Do not enable or use the local APIC.
3455 nolapic_timer [X86-32,APIC] Do not use the local APIC timer.
3460 nomca [IA-64] Disable machine check abort handling
3462 nomce [X86-32] Disable Machine Check Exception
3464 nomfgpt [X86-32] Disable Multi-Function General Purpose
3476 nopcid [X86-64] Disable the PCID cpu feature.
3481 noreplace-smp [X86-32,SMP] Don't replace SMP instructions
3492 no-scroll [VGA] Disables scrollback.
3493 This is required for the Braillex ib80-piezo Braille
3496 nosbagart [IA-64]
3498 nosep [BUGS=X86-32] Disables x86 SYSENTER/SYSEXIT support.
3503 nosoftlockup [KNL] Disable the soft-lockup detector.
3508 soft-lockup and NMI watchdog (hard-lockup).
3512 nox2apic [X86-64,APIC] Do not enable x2APIC mode.
3537 nptcg= [IA-64] Override max number of concurrent global TLB
3546 n. So during boot up some boot time memory for per-cpu
3547 variables need be pre-allocated for later physical cpu
3558 See Documentation/admin-guide/sysctl/vm.rst for details.
3561 See Documentation/core-api/debugging-via-ohci1394.rst for more
3573 For example, to override I2C bus2:
3600 running on a platform with a direct-mapped memory-side
3606 page_owner= [KNL] Boot-time page_owner enabling option.
3612 page_poison= [KNL] Boot-time parameter changing the state of
3642 See Documentation/admin-guide/tainted-kernels.rst for
3650 Run kdump after running panic-notifiers and dumping
3695 See also Documentation/admin-guide/blockdev/paride.rst.
3724 bios [X86-32] force use of PCI BIOS, don't access
3726 has a non-standard PCI host bridge.
3727 nobios [X86-32] disallow use of PCI BIOS, only direct
3733 data in IO port 0xCFC, both 32-bit).
3735 Mechanism 2 (IO port 0xCF8 is an 8-bit port for
3736 the function, IO port 0xCFA, also 8-bit, sets
3738 through ports 0xC000-0xCFFF).
3745 root domains (aka PCI segments, in ACPI-speak).
3753 disable the use of MSI interrupts system-wide.
3758 primary IO-APIC for bridges that cannot disable
3765 biosirq [X86-32] Use PCI BIOS calls to get the interrupt
3789 F0000h-100000h range.
3794 assign-busses [X86] Always assign all PCI bus
3822 bfsort Sort PCI devices into breadth-first order.
3825 nobfsort Don't sort PCI devices into breadth-first order.
3827 tuning and use the BIOS-configured MPS defaults.
3837 configuration allows peer-to-peer DMA between
3840 that hot-added devices will work.
3855 A PCI-PCI bridge can be specified if resource
3861 for 4096-byte alignment.
3863 end-to-end CRC checking).
3892 noats [PCIE, Intel-IOMMU, AMD-IOMMU]
3928 dpc-native Use native PCIe service for DPC only. May
3945 Keep all power-domains already enabled by bootloader on,
3951 See Documentation/admin-guide/blockdev/paride.rst.
3966 See Documentation/admin-guide/blockdev/paride.rst.
3969 See Documentation/admin-guide/blockdev/paride.rst.
3971 pirq= [SMP,APIC] Manual mp-table setup
3972 See Documentation/x86/i386/IO-APIC.rst.
3976 See also Documentation/admin-guide/parport.rst.
3987 CONFIG_PNP_DEBUG_MESSAGES option). Change at run-time
3996 { on | off | curr | res | no-curr | no-res }
4034 print-fatal-signals=
4040 coredump - etc.
4043 you might want to try "ulimit -i unlimited".
4055 on - unlimited logging to /dev/kmsg from userspace
4056 off - logging to /dev/kmsg disabled
4057 ratelimit - ratelimit the logging
4064 Limit processor to maximum C-state
4068 Ignore the _CST method to determine C-states,
4075 Param: "schedule" - profile schedule points.
4076 Param: "sleep" - profile D-state sleeping (millisecs).
4078 Param: "kvm" - profile VM exits.
4079 Param: <number> - step/bucket size as a power of 2 for
4109 See Documentation/admin-guide/blockdev/paride.rst.
4111 pti= [X86-64] Control Page Table Isolation of user and
4116 on - unconditionally enable
4117 off - unconditionally disable
4118 auto - kernel detects whether your CPU model is
4123 nopti [X86-64]
4127 [KNL] Number of legacy pty's. Overwrites compiled-in
4135 See Documentation/admin-guide/md.rst.
4138 See Documentation/admin-guide/blockdev/ramdisk.rst.
4154 ras=option[,option,...] [KNL] RAS-specific options
4166 the specified list of CPUs to be no-callback CPUs.
4169 purpose, where "x" is "p" for RCU-preempt, and
4170 "s" for RCU-sched, and "N" is the CPU number.
4172 which can be useful for HPC and real-time
4181 This improves the real-time response for the
4198 RCU grace-period cleanup.
4202 RCU grace-period initialization.
4206 RCU grace-period pre-initialization, that is,
4207 the propagation of recent CPU-hotplug changes up
4212 per-CPU rcuc kthreads. Defaults to a non-zero
4220 cache-to-cache transfer latencies.
4226 and for NUMA systems with large remote-access
4239 Set delay from grace-period initialization to
4252 soliciting quiescent-state help from
4264 Set the SCHED_FIFO priority of the RCU per-CPU
4267 and for the RCU grace-period kthreads (rcu_bh,
4269 set, valid values are 1-99 and the default is 1
4270 (the least-favored priority). Otherwise, when
4271 RCU_BOOST is not set, valid values are 0-99 and
4272 the default is zero (non-realtime operation).
4278 the wakeup overhead on the global grace-period
4280 each group's NOCB grace-period kthread.
4288 batch limiting is re-enabled.
4292 RCU's force-quiescent-state scan will aggressively
4310 Cause the grace-period kthread to get an extra
4312 it should at force-quiescent-state time.
4318 this specifies an rcu_read_unlock()-time delay
4322 of RCU-protected pointers after the relevant
4332 grace-period primitives such as call_rcu().
4343 grace-period primitives.
4346 Set test-start holdoff period. The purpose of
4365 Set number of RCU readers. The value -1 selects
4367 "n" less than -1 selects N-n+1, where N is again
4368 the number of CPUs. For example, -2 selects N
4369 (the number of CPUs), -3 selects N+1, and so on.
4370 A value of "n" less than or equal to -N selects
4383 complete. This is useful for hands-off automated
4390 Write-side holdoff between grace periods,
4407 Enable RCU grace-period forward-progress testing
4411 Specify the fraction of a CPU-stall-warning
4412 period to do tight-loop forward-progress testing.
4416 forward-progress tests.
4420 need_resched() during tight-loop forward-progress
4424 Use conditional/asynchronous update-side
4428 Use expedited update-side primitives, if available.
4431 Use normal (non-expedited) asynchronous
4432 update-side primitives, if available.
4435 Use normal (non-expedited) synchronous
4436 update-side primitives, if available. If all
4440 they are all non-zero.
4448 Leak an RCU-protected pointer out of the reader.
4463 Set number of RCU readers. The value -1 selects
4464 N-1, where N is the number of CPUs. A value
4465 "n" less than -1 selects N-n-2, where N is again
4466 the number of CPUs. For example, -2 selects N
4467 (the number of CPUs), -3 selects N+1, and so on.
4470 Enable debug-object double-call_rcu() testing.
4473 Set time (s) after boot for CPU-hotplug testing.
4476 Set time (jiffies) between CPU-hotplug operations,
4477 or zero to disable CPU-hotplug testing.
4480 Set the number of read-then-exit kthreads used
4482 task-exit processing.
4485 The number of times in a given read-then-exit
4486 episode that a set of read-then-exit kthreads
4491 read-then-exit testing episodes.
4494 Set task-shuffle interval (s). Shuffling tasks
4495 allows some CPUs to go into dyntick-idle mode
4500 is useful for hands-off automated testing.
4509 to any other stall-related activity.
4519 grace-period kthread to test RCU CPU stall
4545 Test RCU's dyntick-idle handling. See also the
4571 Use expedited grace-period primitives, for
4575 real-time latency, and degrade energy efficiency.
4579 Use only normal grace-period primitives,
4582 real-time latency, CPU utilization, and
4584 increased grace-period latency. This parameter
4591 only normal grace-period primitives. No effect
4598 number avoids disturbing real-time workloads,
4615 force - Override the decision by the kernel to hide the
4643 Set test-start holdoff period. The purpose of
4652 but the default has already reduced the per-pass
4657 Set number of readers. The default value of -1
4666 Set the read-side critical-section duration,
4670 Specify the read-protection implementation to test.
4683 See Documentation/admin-guide/cgroup-v1/cpusets.rst.
4691 reservetop= [X86-32]
4713 See Documentation/power/swsusp-and-swap-files.rst
4729 during restoration read-only).
4737 AMD-based UNRET and IBPB mitigations alone do not stop
4739 sibling threads. For that reason, STIBP is used on pro-
4743 off - no mitigation
4744 auto - automatically select a migitation
4745 auto,nosmt - automatically select a mitigation,
4749 ibpb - On AMD, mitigate short speculation
4754 ibpb,nosmt - Like "ibpb" above but will disable SMT
4758 unret - Force enable untrained return thunks,
4759 only effective on AMD f15h-f17h based
4761 unret,nosmt - Like unret, but will disable SMT when STIBP
4789 ro [KNL] Mount root device read-only on boot
4792 on Mark read-only kernel memory as read-only (default).
4793 off Leave read-only kernel memory writable for debugging.
4798 debug-uart get routed to the D+ and D- pins of the usb
4820 rw [KNL] Mount root device read-write on boot
4862 to 10 seconds for built-in smp_call_function()
4869 that requesting even small non-zero numbers of
4876 The default of -1 specifies a number of kthreads
4881 test before initiating CPU-hotplug operations.
4885 CPU-hotplug operations. Specifying zero (which
4886 is the default) disables CPU-hotplug operations.
4892 Non-zero values are useful for automated tests.
4915 "wait" parameter. A value of -1 selects the
4916 default if all other weights are -1. However,
4918 value of -1 will instead select a weight of zero.
4923 non-zero "wait" parameter. See weight_single.
4936 non-zero "wait" parameter. See weight_single
4948 non-zero "wait" parameter. See weight_single
4955 0 -- disable. (may be 1 via CONFIG_CMDLINE="skew_tick=1"
4956 1 -- enable.
4967 0 -- disable.
4968 1 -- enable.
4974 0 -- disable.
4975 1 -- enable.
4978 serialnumber [BUGS=X86-32]
4983 simeth= [IA-64]
5017 memory cgroup sub-caches. 1 to enable, 0 to disable.
5050 smsc-ircc2.nopnp [HW] Don't use PNP to discover SMC devices
5051 smsc-ircc2.ircc_cfg= [HW] Device configuration I/O port
5052 smsc-ircc2.ircc_sir= [HW] SIR base I/O port
5053 smsc-ircc2.ircc_fir= [HW] FIR base I/O port
5054 smsc-ircc2.ircc_irq= [HW] IRQ line
5055 smsc-ircc2.ircc_dma= [HW] DMA channel
5056 smsc-ircc2.ircc_transceiver= [HW] Transceiver type:
5066 Default: -1 (no limit)
5069 [KNL] Should the soft-lockup detector generate panics.
5072 A value of 1 instructs the soft-lockup detector
5073 to panic the machine when a soft-lockup occurs. It is
5076 respective build-time switch to that functionality.
5079 [KNL] Should the soft-lockup detector generate
5084 See Documentation/admin-guide/laptops/sonypi.rst
5091 on - unconditionally enable, implies
5093 off - unconditionally disable, implies
5095 auto - kernel detects whether your CPU model is
5112 retpoline - replace indirect branches
5113 retpoline,generic - Retpolines
5114 retpoline,lfence - LFENCE; indirect branch
5115 retpoline,amd - alias for retpoline,lfence
5116 eibrs - Enhanced/Auto IBRS
5117 eibrs,retpoline - Enhanced/Auto IBRS + Retpolines
5118 eibrs,lfence - Enhanced/Auto IBRS + LFENCE
5119 ibrs - use IBRS to protect kernel
5129 on - Unconditionally enable mitigations. Is
5132 off - Unconditionally disable mitigations. Is
5135 prctl - Indirect branch speculation is enabled,
5141 - Like "prctl" above, but only STIBP is
5147 - Same as "prctl" above, but all seccomp
5152 - Like "seccomp" above, but only STIBP is
5157 auto - Kernel selects the mitigation depending on
5169 off - Disable mitigation
5170 microcode - Enable microcode mitigation only
5171 safe-ret - Enable sw-only safe RET mitigation (default)
5172 ibpb - Enable mitigation by issuing IBPB on
5174 ibpb-vmexit - Issue IBPB only on VMEXIT
5175 (cloud-specific mitigation)
5200 on - Unconditionally disable Speculative Store Bypass
5201 off - Unconditionally enable Speculative Store Bypass
5202 auto - Kernel detects whether the CPU model contains an
5208 prctl - Control Speculative Store Bypass per thread
5212 seccomp - Same as "prctl" above, but all seccomp threads
5220 on,auto - On Power8 and Power9 insert a store-forwarding
5224 off - No action.
5241 off - not enabled
5243 warn - the kernel will emit rate limited warnings
5248 fatal - the kernel will send SIGBUS to applications
5260 Certain CPUs are vulnerable to an MDS-like
5278 grace-period sequence counter wrap for the
5279 srcu_data structure's ->srcu_gp_seq_needed field.
5301 force-on: Unconditionally enable mitigation for
5303 force-off: Unconditionally disable mitigation for
5320 stacktrace_filter=[function-list]
5322 will trace at boot up. function-list is a comma separated
5330 Set the STI (builtin display/keyboard on the HP-PARISC
5332 as the initial boot-console.
5370 global a single global pool contains all CPUs
5371 percpu one pool for each CPU
5372 pernode one pool for each NUMA node (equivalent
5373 to global on non-NUMA machines)
5399 it if 0 is given (See Documentation/admin-guide/cgroup-v1/memory.rst)
5401 swiotlb= [ARM,IA-64,PPC,MIPS,X86]
5403 <int> -- Number of I/O TLB slabs
5404 force -- force using of bounce buffers even if they
5406 noforce -- Never use bounce buffers (for debugging)
5430 Ignore sysrq setting - this boot parameter will
5438 cache size. See Documentation/networking/ip-sysctl.rst
5444 Specify "mem" (for Suspend-to-RAM) or "standby" (for
5449 wakeup-capable RTC alarm.
5455 -1: disable all active trip points in all thermal zones
5459 -1: disable all critical trip points in all thermal zones
5470 -1: disable all passive trip points
5476 <deci-seconds>: poll all this frequency
5498 Prevent the CPU-hotplug component of torturing
5502 Dump the ftrace buffer at torture-test shutdown,
5506 with rotating-rust storage.
5522 trace_event=[event-list]
5524 to facilitate early boot debugging. The event-list is a
5528 trace_options=[option-list]
5530 The option-list is a comma delimited list of options
5580 See Documentation/admin-guide/mm/transhuge.rst
5588 high-resolution timer mode on older hardware, and in
5614 on - Enable TSX on the system. Although there are
5617 several previous speculation-related CVEs, and
5621 off - Disable TSX on the system. (Note that this
5629 auto - Disable TSX if X86_BUG_TAA is present,
5634 See Documentation/admin-guide/hw-vuln/tsx_async_abort.rst
5640 Similar to Micro-architectural Data Sampling (MDS)
5655 full - Enable TAA mitigation on vulnerable CPUs
5658 full,nosmt - Enable TAA mitigation and disable SMT on
5661 vulnerable to cross-thread TAA attacks.
5662 off - Unconditionally disable TAA mitigation
5664 On MDS-affected machines, tsx_async_abort=off can be
5676 Documentation/admin-guide/hw-vuln/tsx_async_abort.rst
5682 See also Documentation/input/devices/joystick-parport.rst
5684 udbg-immortal [PPC] When debugging early kernel crashes that
5690 Set number of hash buckets for UDP/UDP-Lite connections
5692 uhci-hcd.ignore_oc=
5694 Some badly-designed motherboards generate lots of
5705 (default -1 = authorized except for wireless USB,
5711 for newly-detected USB devices (default 2). This
5739 [USB] Specifies timeout for the initial 64-byte
5746 [USB] A list of quirk entries to augment the built-in
5749 VendorID:ProductID:Flags. The IDs are 4-digit hex
5751 will change the built-in quirk; setting it if it is
5756 a 255-byte read);
5760 Set-Interface requests);
5779 (bInterval-1).
5814 usb-storage.delay_use=
5818 usb-storage.quirks=
5820 override the built-in unusual_devs list. List
5823 and Product ID values (4-digit hex numbers) and
5825 to a common usb-storage quirk flag as follows:
5867 medium is write-protected).
5876 1 - undefined instruction events
5877 2 - system calls
5878 4 - invalid data aborts
5879 8 - SIGSEGV faults
5880 16 - SIGBUS faults
5891 On X86_32, this is an alias for vdso32=. Otherwise:
5896 vdso32= [X86] Control the 32-bit vDSO
5897 vdso32=1: enable 32-bit VDSO
5898 vdso32=0 or vdso32=2: disable 32-bit VDSO
5905 alias for vdso32=0.
5908 dl_main: Assertion `(void *) ph->p_vaddr == _rtld_local._dl_sysinfo_dso' failed!
5910 vector= [IA-64,SMP]
5941 vga= [BOOT,X86-32] Select a particular video mode
5943 Documentation/admin-guide/svga.rst.
5958 - Disable all of the above options
5979 vsyscall= [X86-64]
5982 code). Most statically-linked binaries and older
6006 see VGA-softcursor.txt. Default: 2 = underline.
6011 This is a 16-member array composed of values
6012 ranging from 0-255.
6017 This is a 16-member array composed of values
6018 ranging from 0-255.
6023 This is a 16-member array composed of values
6024 ranging from 0-255.
6029 Set system-wide default UTF-8 mode for all tty's.
6030 Default is 1, i.e. UTF-8 mode is enabled for all
6035 Format=<-1|0|1>
6036 Set system-wide default for whether a cursor
6037 is shown on new VTs. Default is -1,
6042 vt.italic= [VT] Default color for italic text; 0-15.
6045 vt.underline= [VT] Default color for underlined text; 0-15.
6049 see Documentation/watchdog/watchdog-parameters.rst
6050 or other driver-specific files in the
6076 that this also can be controlled per-workqueue for
6080 Per-cpu workqueues are generally preferred because
6082 locality; unfortunately, per-cpu workqueues tend to
6085 Enabling this makes the per-cpu workqueues which
6100 forces round-robin CPU selection to flush out
6108 on - Enable writecombine, use WUC for ioremap_wc()
6109 off - Disable writecombine, use SUC for ioremap_wc()
6111 x2apic_phys [X86-64,APIC] Use x2apic physical mode instead of
6115 x86_intel_mid_timer= [X86-32,APBT]
6121 xen_512gb_limit [KNL,X86-64,XEN]
6131 ide-disks -- unplug primary master IDE devices
6132 aux-ide-disks -- unplug non-primary-master IDE devices
6133 nics -- unplug network devices
6134 all -- unplug all emulated devices (NICs and IDE disks)
6135 unnecessary -- unplugging emulated devices is
6138 never -- do not unplug even if version check succeeds
6165 xen_timer_slop= [X86-64,XEN]
6190 preferred over the 2-level event handling, as it is
6217 xhci-hcd.quirks [USB,KNL]