Lines Matching +full:geni +full:- +full:uart
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
299 Allow execve() of 32-bit applications and setting of the
301 subset of the CPUs support 32-bit EL0. When this
302 parameter is present, the set of CPUs supporting 32-bit
304 and hot-unplug operations may be restricted.
306 amd_iommu= [HW,X86-64]
309 fullflush - enable flushing of IO/TLB entries when
313 off - do not initialize any AMD IOMMU found in
315 force_isolation - Force device isolation for all
321 amd_iommu_dump= [HW,X86-64]
327 amd_iommu_intr= [HW,X86-64]
330 legacy - Use legacy interrupt remapping mode.
331 vapic - Use virtual APIC mode, which allows IOMMU
333 This mode requires kvm-amd.avic=1.
347 Power management functions (SPARCstation-4/5 + deriv.)
349 Disable APC CPU standby support. SPARCstation-Fox does
350 not play well with APC CPU idle - disable it if you have
357 when initialising the APIC and IO-APIC components.
358 For X86-32, this can also be used to specify an APIC
378 to set it to "all" by meaning -- no limit here.
387 arcrimi= [HW,NET] ARCnet - "RIM I" (entirely mem-mapped) cards
420 audit= [KNL] Enable the audit sub-system
422 0 | off - kernel audit is disabled and can not be
424 unset - kernel audit is initialized but disabled and
426 1 | on - kernel audit is initialized and partially
439 0 - Disable the BAU.
440 1 - Enable the BAU.
441 unset - Disable the BAU.
462 See Documentation/block/cmdline-partition.rst
473 See Documentation/admin-guide/bootconfig.rst
484 bttv.pll= See Documentation/admin-guide/media/bttv.rst
493 cachesize= [BUGS=X86-32] Override level 2 CPU cache size detection.
512 inclusive. See arch/mips/include/asm/pgtable-bits.h
522 - foo isn't auto-mounted if you mount all cgroups in
524 - foo isn't visible as an individually mountable
526 - if foo is an optional feature then the feature is
532 Specifying "pressure" disables per-cgroup pressure
546 nosocket -- Disable socket memory accounting.
547 nokmem -- Disable kernel memory accounting.
552 0 -- check protection applied by kernel (includes
554 1 -- check protection requested by application.
568 force such clocks to be always-on nor does it reserve
572 information, see Documentation/driver-api/clk.rst.
574 clock= [BUGS=X86-32, HW] gettimeofday clocksource override.
591 [X86-32] pit,hpet,tsc;
598 [X86-64] hpet,tsc
604 architected timer so that code using WFE-based polling
627 cma=nn[MG]@[start[MG][-end[MG]]]
638 Sets the size of kernel per-numa memory area for
640 per-numa CMA altogether. And If this option is not
642 With per-numa CMA enabled, DMA users on node nid will
658 com20020= [HW,NET] ARCnet - COM20020 chipset
662 com90io= [HW,NET] ARCnet - COM90xx chipset (IO-mapped buffers)
666 ARCnet - COM90xx chipset (memory-mapped buffers)
684 See Documentation/admin-guide/serial-console.rst for more
689 uart[8250],io,<addr>[,options]
690 uart[8250],mmio,<addr>[,options]
691 uart[8250],mmio16,<addr>[,options]
692 uart[8250],mmio32,<addr>[,options]
693 uart[8250],0x<addr>[,options]
694 Start an early, polled-mode console on the 8250/16550
695 UART at the specified I/O port or MMIO address,
697 MMIO inter-register address stride is either 8-bit
698 (mmio), 16-bit (mmio16), or 32-bit (mmio32).
702 the h/w is not re-initialized.
723 syscall, or to executing "dmesg -S --raw" or to reading
743 disable the cpuidle sub-system
749 disable the cpufreq sub-system
757 [X86] Delay for N microsec between assert and de-assert
772 [KNL, X86-64] Select a region under 4G first, and
775 See Documentation/admin-guide/kdump/kdump.rst for further details.
780 start-[end] where start and end are both
782 Documentation/admin-guide/kdump/kdump.rst for an example.
785 [KNL, X86-64] range could be above 4G. Allow kernel
792 [KNL, X86-64] range under 4G. When crashkernel=X,high
797 low memory is needed to make sure DMA buffers for 32-bit
807 [KNL] Disable crypto self-tests
821 See also Documentation/input/devices/joystick-parport.rst
825 Documentation/admin-guide/dynamic-debug-howto.rst for
839 [KNL] verbose self-tests
842 self-tests.
844 1 will print _a lot_ more information - normally
882 Format: { on, no-mount, off }
884 no-mount:
889 get a -EPERM as result when trying to register files
893 Default value is set in build-time with a kernel configuration.
909 Documentation/admin-guide/mm/hugetlbpage.rst.
960 against bounds-checking flaws in the kernel's
1020 entries for DMA-API debugging code. One entry is
1021 required per DMA-API allocation. Use this if the
1022 DMA-API debugging code disables itself because the
1026 With this option the DMA-API debugging driver
1041 Generic built-in EDID data sets are used, if one of
1046 available in Documentation/admin-guide/edid.rst. An EDID
1058 Control how the dt_cpu_ftrs device-tree binding is
1068 what data is available or for reverse-engineering.
1073 Documentation/admin-guide/dynamic-debug-howto.rst
1090 determined by stdout-path property in device tree's
1095 Start an early, polled-mode console on a Cadence
1101 uart[8250],io,<addr>[,options]
1102 uart[8250],mmio,<addr>[,options]
1103 uart[8250],mmio32,<addr>[,options]
1104 uart[8250],mmio32be,<addr>[,options]
1105 uart[8250],0x<addr>[,options]
1106 Start an early, polled-mode console on the 8250/16550
1107 UART at the specified I/O port or MMIO address.
1108 MMIO inter-register address stride is either 8-bit
1109 (mmio) or 32-bit (mmio32 or mmio32be).
1117 Start an early, polled-mode console on a pl011 serial
1121 the driver will use only 32-bit accessors to read/write
1125 Start an early, polled-mode console on a meson serial
1131 Start an early, polled-mode console on an msm serial
1137 Start an early, polled-mode console on an msm serial
1143 Start an early, polled-mode console on a serial port
1149 Start an early, polled-mode console on a serial port
1155 Use RISC-V SBI (Supervisor Binary Interface) for early
1168 a correct base address of the selected UART port. The
1173 Start an early, polled-mode console on a lantiq serial
1180 Use early console provided by Freescale LP UART driver
1187 Start an early, polled-mode, output-only console on the
1188 Freescale i.MX UART at the specified address. The UART
1192 Start an early, polled-mode console on the
1198 Start an early, polled-mode console on a Qualcomm
1199 Generic Interface (GENI) based serial port at the
1206 coherent non-x86 systems that use system memory for
1211 Use early console provided by Freescale LINFlexD UART
1244 2: uart:ST16650V2 port:00001008 irq:18 ...
1258 UART class.
1317 attribute is added to range 0x100000000-0x180000000 and
1318 0x10a0000000-0x1120000000.
1322 range 0x240000000-0x43fffffff.
1334 Documentation/admin-guide/acpi/ssdt-overlays.rst for details.
1340 elanfreq= [X86-32]
1348 See Documentation/admin-guide/kdump/kdump.rst for details.
1364 0 -- permissive (log only, no denials).
1365 1 -- enforcing (deny and log).
1389 See also Documentation/fault-injection/.
1393 See Documentation/admin-guide/sysctl/net.rst for
1397 See Documentation/admin-guide/blockdev/floppy.rst.
1400 [IA-64] Avoid check_sal_cache_flush which may hang on
1405 forcepae [X86-32]
1424 ftrace_filter=[function-list]
1426 tracer at boot up. function-list is a comma separated
1431 ftrace_notrace=[function-list]
1433 function-list. This list can be changed at run time
1437 ftrace_graph_filter=[function-list]
1440 function-list is a comma separated list of functions
1444 ftrace_graph_notrace=[function-list]
1446 function-list. This list is a comma separated list of
1466 off -- Don't create device links from firmware info.
1467 permissive -- Create device links from firmware info
1470 on -- Create device links from firmware info and use it
1472 rpm -- Like "on", but also use to order runtime PM.
1483 See also Documentation/input/devices/joystick-parport.rst
1487 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.
1636 (disabled by default, and as a pre-condition
1638 i8042.direct [HW] Put keyboard port into non-translated mode
1652 suspend-to-ram transitions, only during s2r
1687 -1 -- never invert brightness
1688 0 -- machine default
1689 1 -- force brightness inversion
1694 ide-core.nodma= [HW] (E)IDE subsystem
1700 ide-generic.probe-mask= [HW] (E)IDE subsystem
1712 ide-pci-generic.all-generic-ide [HW] (E)IDE subsystem
1723 idle=nomwait: Disable mwait for CPU C-states
1740 legacy only accept legacy-NaN binaries, if supported
1742 2008 only accept 2008-NaN binaries, if supported
1751 'relaxed' straps the emulator for both legacy-NaN and
1752 2008-NaN, whereas 'strict' enables legacy-NaN only on
1761 Ignore loglevel setting - this will print /all/
1825 Formats: { "ima" | "ima-ng" | "ima-sig" }
1826 Default: "ima-ng"
1858 initcall_blacklist= [KNL] Do not execute a comma-separated list of
1859 initcall functions. Useful for debugging built-in
1892 0 -- basic integrity auditing messages. (Default)
1893 1 -- additional integrity auditing messages.
1906 forcedac [X86-64]
1908 for io virtual address below 32-bit forcing dual
1910 than 32-bit addressing. The default is to look
1911 for translation below 32-bit and if not available
1929 could harm performance of some high-throughput
1943 1 to 9 specify maximum depth of C-state.
1953 used along with the hardware-managed P-states (HWP)
1957 in favor of acpi-cpufreq. Forcing the intel_pstate driver
1958 instead of acpi-cpufreq may disable platform features, such
1960 P-States information being indicated to OSPM and therefore
1963 or on platforms that use pcc-cpufreq instead of acpi-cpufreq.
1976 Allow per-logical-CPU P-State performance control limits using
1979 intremap= [X86-64, Intel-IOMMU]
1984 BIOS x2APIC opt-out request will be ignored
2008 0 - Lazy mode.
2014 1 - Strict mode (default).
2021 0 - Use IOMMU translation for DMA.
2022 1 - Bypass the IOMMU for DMA.
2023 unset - Use value of CONFIG_IOMMU_DEFAULT_PASSTHROUGH.
2025 io7= [HW] IO7 for Marvel-based Alpha systems
2040 See Documentation/admin-guide/nfs/nfsroot.rst.
2064 Enables support for pseudo-NMIs in the kernel. This
2083 [Deprecated - use cpusets instead]
2084 Format: [flag-list,]<cpu-list>
2115 "number of CPUs in system - 1".
2141 The format of <cpu-list> is described above.
2145 ivrs_ioapic [HW,X86-64]
2146 Provide an override to the IOAPIC-ID<->DEVICE-ID
2148 example, to map IOAPIC-ID decimal 10 to
2152 ivrs_hpet [HW,X86-64]
2153 Provide an override to the HPET-ID<->DEVICE-ID
2155 example, to map HPET-ID decimal 0 to
2159 ivrs_acpihid [HW,X86-64]
2160 Provide an override to the ACPI-HID:UID<->DEVICE-ID
2162 example, to map UART-HID:UID AMD0020:0 to
2182 kernelcore= [KNL,X86,IA-64,PPC]
2185 the kernel for non-movable allocations. The requested
2195 subsystem. Note that allocations like PTEs-from-HighMem
2203 for non-movable allocations and remaining memory is used
2214 gdb or control-c on the dbgp connection. When
2215 not using this parameter you use sysrq-g to break into
2220 or a supported polling keyboard driver (non-usb).
2247 Configure the RouterBoard 532 series on-chip
2250 kmemleak= [KNL] Boot-time kmemleak enable/disable
2256 kprobe_event=[probe-list]
2258 The probe-list is a semicolon delimited list of probe
2304 kvm-amd.nested= [KVM,AMD] Allow nested virtualization in KVM/SVM.
2307 kvm-amd.npt= [KVM,AMD] Disable nested paging (virtualized MMU)
2309 Default is 1 (enabled) if in 64-bit or 32-bit PAE mode.
2311 kvm-arm.mode=
2314 nvhe: Standard nVHE-based mode, without support for
2317 protected: nVHE-based mode with support for guests whose
2324 kvm-arm.vgic_v3_group0_trap=
2325 [KVM,ARM] Trap guest accesses to GICv3 group-0
2328 kvm-arm.vgic_v3_group1_trap=
2329 [KVM,ARM] Trap guest accesses to GICv3 group-1
2332 kvm-arm.vgic_v3_common_trap=
2336 kvm-arm.vgic_v4_enable=
2348 kvm-intel.ept= [KVM,Intel] Disable extended page tables
2352 kvm-intel.emulate_invalid_guest_state=
2354 Ignored if kvm-intel.enable_unrestricted_guest=1, as
2360 kvm-intel.flexpriority=
2364 kvm-intel.nested=
2368 kvm-intel.unrestricted_guest=
2373 kvm-intel.vmentry_l1d_flush=[KVM,Intel] Mitigation for L1 Terminal Fault
2374 CVE-2018-3620.
2385 kvm-intel.vpid= [KVM,Intel] Disable Virtual Processor Identification
2452 For details see: Documentation/admin-guide/hw-vuln/l1tf.rst
2458 lapic [X86-32,APIC] Enable the local APIC even if BIOS
2462 value for LAPIC timer one-shot implementation. Default
2497 first fan-out link behind PMP device. It does not
2511 * Transfer mode: pio[0-7], mwdma[0-4] and udma[0-7].
2523 hot-unplug link recovery
2538 call memblock_remove on the regions marked with no-map
2566 Set the number of locking read-acquisition kthreads.
2571 Set the number of locking write-acquisition kthreads.
2574 Set time (s) after boot for CPU-hotplug testing.
2577 Set time (s) between CPU-hotplug operations, or
2578 zero to disable CPU-hotplug testing.
2581 Set task-shuffle interval (jiffies). Shuffling
2582 tasks allows some CPUs to go into dyntick-idle
2587 is useful for hands-off automated testing.
2620 7 (KERN_DEBUG) debug-level messages
2630 logo.nologo [FB] Disables display of the built-in Linux logo.
2648 an IEEE 1284-compliant printer is attached; if
2654 time-consuming boot-time autodetection (up to 250 ms per
2675 machvec= [IA-64] Force the use of a particular machine-vector
2681 Example: machtype=lemote-yeeloong-2f-7inch
2696 (loop.max_loop) unconditionally pre-created at init time. The default
2699 devices can be requested on-demand with the
2700 /dev/loop-control interface.
2702 mce [X86-32] Machine Check Exception
2704 mce=option [X86-64] See Documentation/x86/x86_64/boot-options.rst
2707 See Documentation/admin-guide/md.rst.
2714 Control mitigation for the Micro-architectural Data
2729 full - Enable MDS mitigation on vulnerable CPUs
2730 full,nosmt - Enable MDS mitigation and disable
2732 off - Unconditionally disable MDS mitigation
2734 On TAA-affected machines, mds=off can be prevented by
2743 For details see: Documentation/admin-guide/hw-vuln/mds.rst
2762 mem=nopentium [BUGS=X86-32] Disable usage of 4MB pages for kernel
2767 per-device physically contiguous DMA buffers.
2775 See Documentation/admin-guide/mm/memory-hotplug.rst.
2800 Example: Exclude memory from 0x18690000-0x1869ffff
2814 memmap=<size>%<offset>-<oldtype>+<newtype>
2816 from <oldtype> to <newtype>. If "-<oldtype>" is left
2831 repeatable BIOS-originated corruption always
2856 mem_encrypt= [X86-64] AMD Secure Memory Encryption (SME) control
2864 Refer to Documentation/virt/kvm/amd-memory-encryption.rst
2868 s2idle - Suspend-To-Idle
2869 shallow - Power-On Suspend or equivalent (if supported)
2870 deep - Suspend-To-RAM or equivalent (if supported)
2871 See Documentation/admin-guide/pm/sleep-states.rst.
2874 See Documentation/admin-guide/media/meye.rst.
2876 mfgpt_irq= [IA-32] Specify the IRQ to use for the
2877 Multi-Function General Purpose Timers on AMD Geode
2880 mfgptfix [X86-32] Fix MFGPT timers on AMD Geode platforms when
2894 0 - The attached screen is the 3.5" TFT
2895 1 - The attached screen is the 7" TFT
2896 2 - The VGA Shield is attached (1024x768)
2900 b - Enable backlight. The TFT backlight pin will be
2904 c - Enable the s3c camera interface.
2905 t - Reserved for enabling touchscreen support. The
2909 https://repo.or.cz/w/linux-2.6/mini2440.git
2914 arch-independent options, each of which is an
2915 aggregation of existing arch-specific options.
2928 ssbd=force-off [ARM64]
2948 have other ways of avoiding SMT-based attacks.
2983 full - Enable mitigation on vulnerable CPUs
2985 full,nosmt - Enable mitigation and disable SMT on
2988 off - Unconditionally disable mitigation
3001 Documentation/admin-guide/hw-vuln/processor_mmio_stale_data.rst
3009 module_blacklist= [KNL] Do not load a comma-separated list of
3023 movablecore= [KNL,X86,IA-64,PPC]
3034 movable_node [KNL] Boot-time switch to make hotplugable memory
3041 Format: <name>,<region-number>,<size>,<offset>
3044 <name>,<region-number>[,<base>,<size>,<buswidth>,<altbuswidth>]
3067 The range of acceptible values are 1-16. Always start with lower
3068 values in the 2-6 range. Higher values should be justified with
3073 onenand.bdry= [HW,MTD] Flex-OneNAND Boundary Configuration
3077 boundary - index of last SLC block on Flex-OneNAND.
3079 lock - Configure if Flex-OneNAND boundary should be locked.
3086 See arch/arm/mach-s3c2412/mach-jive.c
3114 something different and driver-specific.
3125 See Documentation/admin-guide/nfs/nfsroot.rst.
3127 nfsroot= [NFS] nfs root filesystem for disk-less boxes.
3128 See Documentation/admin-guide/nfs/nfsroot.rst.
3131 See Documentation/admin-guide/nfs/nfsroot.rst.
3155 [NFS] enable 64-bit inode numbers.
3156 If zero, the NFS client will fake up a 32-bit inode
3158 of returning the full 64-bit number.
3159 The default is to return 64-bit inode numbers.
3189 [NFS4] Specify an additional fixed unique ident-
3220 driver. A non-zero value sets the minimum interval
3232 NMI stack-backtrace request.
3241 0 - turn hardlockup detector in nmi_watchdog off
3242 1 - turn hardlockup detector in nmi_watchdog on
3259 no387 [BUGS=X86-32] Tells the kernel to use the 387 maths
3263 no5lvl [X86-64] Disable 5-level paging mode. Forces
3264 kernel to use 4-level paging instead.
3295 caches in the slab allocator. Saves per-node memory,
3315 nodelayacct [KNL] Disable per-task delay accounting
3321 no_entry_flush [PPC] Don't flush the L1-D cache when entering the kernel.
3323 noexec [IA-64]
3326 On X86-32 available only on PAE configured kernels.
3327 noexec=on: enable non-executable mappings (default)
3328 noexec=off: disable non-executable mappings
3338 noexec32 [X86-64]
3339 This affects only 32-bit executables.
3340 noexec32=on: enable non-executable mappings (default)
3342 noexec32=off: disable non-executable mappings
3347 nofxsr [BUGS=X86-32] Disables x86 floating point extended
3349 legacy floating-point registers on task switch.
3373 [PPC] Don't flush the L1-D cache after accessing user data.
3377 enabling legacy floating-point and sse state.
3402 nohalt [IA-64] Tells the kernel not to use the power saving
3404 power-consumption. On the positive side, it reduces
3405 interrupt wake-up latency, which may improve performance
3407 real-time systems.
3417 compared. However, if this command-line option is
3441 noirqdebug [X86-32] Disables the code which attempts to detect and
3452 nointremap [X86-64, Intel-IOMMU] Do not enable interrupt
3454 [Deprecated - use intremap=off]
3456 nointroute [IA-64]
3460 nojitter [IA-64] Disables jitter checking for ITC timers.
3462 no-kvmclock [X86,KVM] Disable paravirtualized KVM clock driver
3464 no-kvmapf [X86,KVM] Disable paravirtualized asynchronous page
3467 no-vmw-sched-clock
3471 no-steal-acc [X86,PV_OPS,ARM64] Disable paravirtualized steal time
3475 nolapic [X86-32,APIC] Do not enable or use the local APIC.
3477 nolapic_timer [X86-32,APIC] Do not use the local APIC timer.
3482 nomca [IA-64] Disable machine check abort handling
3484 nomce [X86-32] Disable Machine Check Exception
3486 nomfgpt [X86-32] Disable Multi-Function General Purpose
3498 nopcid [X86-64] Disable the PCID cpu feature.
3503 noreplace-smp [X86-32,SMP] Don't replace SMP instructions
3514 no-scroll [VGA] Disables scrollback.
3515 This is required for the Braillex ib80-piezo Braille
3518 nosbagart [IA-64]
3520 nosep [BUGS=X86-32] Disables x86 SYSENTER/SYSEXIT support.
3525 nosoftlockup [KNL] Disable the soft-lockup detector.
3530 soft-lockup and NMI watchdog (hard-lockup).
3534 nox2apic [X86-64,APIC] Do not enable x2APIC mode.
3559 nptcg= [IA-64] Override max number of concurrent global TLB
3568 n. So during boot up some boot time memory for per-cpu
3569 variables need be pre-allocated for later physical cpu
3580 See Documentation/admin-guide/sysctl/vm.rst for details.
3583 See Documentation/core-api/debugging-via-ohci1394.rst for more
3622 running on a platform with a direct-mapped memory-side
3628 page_owner= [KNL] Boot-time page_owner enabling option.
3634 page_poison= [KNL] Boot-time parameter changing the state of
3664 See Documentation/admin-guide/tainted-kernels.rst for
3671 pelt= [KNL] Boot-time parameter changing the PELT half life in ms
3678 Run kdump after running panic-notifiers and dumping
3723 See also Documentation/admin-guide/blockdev/paride.rst.
3752 bios [X86-32] force use of PCI BIOS, don't access
3754 has a non-standard PCI host bridge.
3755 nobios [X86-32] disallow use of PCI BIOS, only direct
3761 data in IO port 0xCFC, both 32-bit).
3763 Mechanism 2 (IO port 0xCF8 is an 8-bit port for
3764 the function, IO port 0xCFA, also 8-bit, sets
3766 through ports 0xC000-0xCFFF).
3773 root domains (aka PCI segments, in ACPI-speak).
3781 disable the use of MSI interrupts system-wide.
3786 primary IO-APIC for bridges that cannot disable
3793 biosirq [X86-32] Use PCI BIOS calls to get the interrupt
3817 F0000h-100000h range.
3822 assign-busses [X86] Always assign all PCI bus
3850 bfsort Sort PCI devices into breadth-first order.
3853 nobfsort Don't sort PCI devices into breadth-first order.
3855 tuning and use the BIOS-configured MPS defaults.
3865 configuration allows peer-to-peer DMA between
3868 that hot-added devices will work.
3883 A PCI-PCI bridge can be specified if resource
3889 for 4096-byte alignment.
3891 end-to-end CRC checking).
3920 noats [PCIE, Intel-IOMMU, AMD-IOMMU]
3956 dpc-native Use native PCIe service for DPC only. May
3973 Keep all power-domains already enabled by bootloader on,
3979 See Documentation/admin-guide/blockdev/paride.rst.
3994 See Documentation/admin-guide/blockdev/paride.rst.
3997 See Documentation/admin-guide/blockdev/paride.rst.
3999 pirq= [SMP,APIC] Manual mp-table setup
4000 See Documentation/x86/i386/IO-APIC.rst.
4004 See also Documentation/admin-guide/parport.rst.
4015 CONFIG_PNP_DEBUG_MESSAGES option). Change at run-time
4024 { on | off | curr | res | no-curr | no-res }
4062 print-fatal-signals=
4068 coredump - etc.
4071 you might want to try "ulimit -i unlimited".
4083 on - unlimited logging to /dev/kmsg from userspace
4084 off - logging to /dev/kmsg disabled
4085 ratelimit - ratelimit the logging
4092 Limit processor to maximum C-state
4096 Ignore the _CST method to determine C-states,
4103 Param: "schedule" - profile schedule points.
4104 Param: "sleep" - profile D-state sleeping (millisecs).
4106 Param: "kvm" - profile VM exits.
4107 Param: <number> - step/bucket size as a power of 2 for
4137 See Documentation/admin-guide/blockdev/paride.rst.
4139 pti= [X86-64] Control Page Table Isolation of user and
4144 on - unconditionally enable
4145 off - unconditionally disable
4146 auto - kernel detects whether your CPU model is
4151 nopti [X86-64]
4155 [KNL] Number of legacy pty's. Overwrites compiled-in
4163 See Documentation/admin-guide/md.rst.
4166 See Documentation/admin-guide/blockdev/ramdisk.rst.
4182 ras=option[,option,...] [KNL] RAS-specific options
4194 the specified list of CPUs to be no-callback CPUs.
4197 purpose, where "x" is "p" for RCU-preempt, and
4198 "s" for RCU-sched, and "N" is the CPU number.
4200 which can be useful for HPC and real-time
4209 This improves the real-time response for the
4226 RCU grace-period cleanup.
4230 RCU grace-period initialization.
4234 RCU grace-period pre-initialization, that is,
4235 the propagation of recent CPU-hotplug changes up
4240 per-CPU rcuc kthreads. Defaults to a non-zero
4248 cache-to-cache transfer latencies.
4254 and for NUMA systems with large remote-access
4267 Set delay from grace-period initialization to
4280 soliciting quiescent-state help from
4292 Set the SCHED_FIFO priority of the RCU per-CPU
4295 and for the RCU grace-period kthreads (rcu_bh,
4297 set, valid values are 1-99 and the default is 1
4298 (the least-favored priority). Otherwise, when
4299 RCU_BOOST is not set, valid values are 0-99 and
4300 the default is zero (non-realtime operation).
4306 the wakeup overhead on the global grace-period
4308 each group's NOCB grace-period kthread.
4316 batch limiting is re-enabled.
4320 RCU's force-quiescent-state scan will aggressively
4338 Cause the grace-period kthread to get an extra
4340 it should at force-quiescent-state time.
4346 this specifies an rcu_read_unlock()-time delay
4350 of RCU-protected pointers after the relevant
4360 grace-period primitives such as call_rcu().
4371 grace-period primitives.
4374 Set test-start holdoff period. The purpose of
4393 Set number of RCU readers. The value -1 selects
4395 "n" less than -1 selects N-n+1, where N is again
4396 the number of CPUs. For example, -2 selects N
4397 (the number of CPUs), -3 selects N+1, and so on.
4398 A value of "n" less than or equal to -N selects
4411 complete. This is useful for hands-off automated
4418 Write-side holdoff between grace periods,
4435 Enable RCU grace-period forward-progress testing
4439 Specify the fraction of a CPU-stall-warning
4440 period to do tight-loop forward-progress testing.
4444 forward-progress tests.
4448 need_resched() during tight-loop forward-progress
4452 Use conditional/asynchronous update-side
4456 Use expedited update-side primitives, if available.
4459 Use normal (non-expedited) asynchronous
4460 update-side primitives, if available.
4463 Use normal (non-expedited) synchronous
4464 update-side primitives, if available. If all
4468 they are all non-zero.
4476 Leak an RCU-protected pointer out of the reader.
4491 Set number of RCU readers. The value -1 selects
4492 N-1, where N is the number of CPUs. A value
4493 "n" less than -1 selects N-n-2, where N is again
4494 the number of CPUs. For example, -2 selects N
4495 (the number of CPUs), -3 selects N+1, and so on.
4498 Enable debug-object double-call_rcu() testing.
4501 Set time (s) after boot for CPU-hotplug testing.
4504 Set time (jiffies) between CPU-hotplug operations,
4505 or zero to disable CPU-hotplug testing.
4508 Set the number of read-then-exit kthreads used
4510 task-exit processing.
4513 The number of times in a given read-then-exit
4514 episode that a set of read-then-exit kthreads
4519 read-then-exit testing episodes.
4522 Set task-shuffle interval (s). Shuffling tasks
4523 allows some CPUs to go into dyntick-idle mode
4528 is useful for hands-off automated testing.
4537 to any other stall-related activity.
4547 grace-period kthread to test RCU CPU stall
4573 Test RCU's dyntick-idle handling. See also the
4599 Use expedited grace-period primitives, for
4603 real-time latency, and degrade energy efficiency.
4607 Use only normal grace-period primitives,
4610 real-time latency, CPU utilization, and
4612 increased grace-period latency. This parameter
4619 only normal grace-period primitives. No effect
4626 number avoids disturbing real-time workloads,
4643 force - Override the decision by the kernel to hide the
4671 Set test-start holdoff period. The purpose of
4680 but the default has already reduced the per-pass
4685 Set number of readers. The default value of -1
4694 Set the read-side critical-section duration,
4698 Specify the read-protection implementation to test.
4711 See Documentation/admin-guide/cgroup-v1/cpusets.rst.
4719 reservetop= [X86-32]
4741 See Documentation/power/swsusp-and-swap-files.rst
4757 during restoration read-only).
4765 AMD-based UNRET and IBPB mitigations alone do not stop
4767 sibling threads. For that reason, STIBP is used on pro-
4771 off - no mitigation
4772 auto - automatically select a migitation
4773 auto,nosmt - automatically select a mitigation,
4777 ibpb - On AMD, mitigate short speculation
4782 ibpb,nosmt - Like "ibpb" above but will disable SMT
4786 unret - Force enable untrained return thunks,
4787 only effective on AMD f15h-f17h based
4789 unret,nosmt - Like unret, but will disable SMT when STIBP
4817 ro [KNL] Mount root device read-only on boot
4820 on Mark read-only kernel memory as read-only (default).
4821 off Leave read-only kernel memory writable for debugging.
4824 Enable the uart passthrough on the designated usb port
4826 debug-uart get routed to the D+ and D- pins of the usb
4848 rw [KNL] Mount root device read-write on boot
4890 to 10 seconds for built-in smp_call_function()
4897 that requesting even small non-zero numbers of
4904 The default of -1 specifies a number of kthreads
4909 test before initiating CPU-hotplug operations.
4913 CPU-hotplug operations. Specifying zero (which
4914 is the default) disables CPU-hotplug operations.
4920 Non-zero values are useful for automated tests.
4943 "wait" parameter. A value of -1 selects the
4944 default if all other weights are -1. However,
4946 value of -1 will instead select a weight of zero.
4951 non-zero "wait" parameter. See weight_single.
4964 non-zero "wait" parameter. See weight_single
4976 non-zero "wait" parameter. See weight_single
4983 0 -- disable. (may be 1 via CONFIG_CMDLINE="skew_tick=1"
4984 1 -- enable.
4995 0 -- disable.
4996 1 -- enable.
5002 0 -- disable.
5003 1 -- enable.
5006 serialnumber [BUGS=X86-32]
5011 simeth= [IA-64]
5045 memory cgroup sub-caches. 1 to enable, 0 to disable.
5078 smsc-ircc2.nopnp [HW] Don't use PNP to discover SMC devices
5079 smsc-ircc2.ircc_cfg= [HW] Device configuration I/O port
5080 smsc-ircc2.ircc_sir= [HW] SIR base I/O port
5081 smsc-ircc2.ircc_fir= [HW] FIR base I/O port
5082 smsc-ircc2.ircc_irq= [HW] IRQ line
5083 smsc-ircc2.ircc_dma= [HW] DMA channel
5084 smsc-ircc2.ircc_transceiver= [HW] Transceiver type:
5094 Default: -1 (no limit)
5097 [KNL] Should the soft-lockup detector generate panics.
5100 A value of 1 instructs the soft-lockup detector
5101 to panic the machine when a soft-lockup occurs. It is
5104 respective build-time switch to that functionality.
5107 [KNL] Should the soft-lockup detector generate
5112 See Documentation/admin-guide/laptops/sonypi.rst
5119 on - unconditionally enable, implies
5121 off - unconditionally disable, implies
5123 auto - kernel detects whether your CPU model is
5140 retpoline - replace indirect branches
5141 retpoline,generic - Retpolines
5142 retpoline,lfence - LFENCE; indirect branch
5143 retpoline,amd - alias for retpoline,lfence
5144 eibrs - enhanced IBRS
5145 eibrs,retpoline - enhanced IBRS + Retpolines
5146 eibrs,lfence - enhanced IBRS + LFENCE
5147 ibrs - use IBRS to protect kernel
5157 on - Unconditionally enable mitigations. Is
5160 off - Unconditionally disable mitigations. Is
5163 prctl - Indirect branch speculation is enabled,
5169 - Like "prctl" above, but only STIBP is
5175 - Same as "prctl" above, but all seccomp
5180 - Like "seccomp" above, but only STIBP is
5185 auto - Kernel selects the mitigation depending on
5217 on - Unconditionally disable Speculative Store Bypass
5218 off - Unconditionally enable Speculative Store Bypass
5219 auto - Kernel detects whether the CPU model contains an
5225 prctl - Control Speculative Store Bypass per thread
5229 seccomp - Same as "prctl" above, but all seccomp threads
5237 on,auto - On Power8 and Power9 insert a store-forwarding
5241 off - No action.
5258 off - not enabled
5260 warn - the kernel will emit rate limited warnings
5265 fatal - the kernel will send SIGBUS to applications
5277 Certain CPUs are vulnerable to an MDS-like
5295 grace-period sequence counter wrap for the
5296 srcu_data structure's ->srcu_gp_seq_needed field.
5318 force-on: Unconditionally enable mitigation for
5320 force-off: Unconditionally disable mitigation for
5343 stacktrace_filter=[function-list]
5345 will trace at boot up. function-list is a comma separated
5353 Set the STI (builtin display/keyboard on the HP-PARISC
5355 as the initial boot-console.
5396 to global on non-NUMA machines)
5422 it if 0 is given (See Documentation/admin-guide/cgroup-v1/memory.rst)
5424 swiotlb= [ARM,IA-64,PPC,MIPS,X86]
5426 <int> -- Number of I/O TLB slabs
5427 force -- force using of bounce buffers even if they
5429 noforce -- Never use bounce buffers (for debugging)
5453 Ignore sysrq setting - this boot parameter will
5461 cache size. See Documentation/networking/ip-sysctl.rst
5467 Specify "mem" (for Suspend-to-RAM) or "standby" (for
5472 wakeup-capable RTC alarm.
5478 -1: disable all active trip points in all thermal zones
5482 -1: disable all critical trip points in all thermal zones
5493 -1: disable all passive trip points
5499 <deci-seconds>: poll all this frequency
5521 Prevent the CPU-hotplug component of torturing
5525 Dump the ftrace buffer at torture-test shutdown,
5529 with rotating-rust storage.
5545 trace_event=[event-list]
5547 to facilitate early boot debugging. The event-list is a
5551 trace_options=[option-list]
5553 The option-list is a comma delimited list of options
5603 See Documentation/admin-guide/mm/transhuge.rst
5611 high-resolution timer mode on older hardware, and in
5637 on - Enable TSX on the system. Although there are
5640 several previous speculation-related CVEs, and
5644 off - Disable TSX on the system. (Note that this
5652 auto - Disable TSX if X86_BUG_TAA is present,
5657 See Documentation/admin-guide/hw-vuln/tsx_async_abort.rst
5663 Similar to Micro-architectural Data Sampling (MDS)
5678 full - Enable TAA mitigation on vulnerable CPUs
5681 full,nosmt - Enable TAA mitigation and disable SMT on
5684 vulnerable to cross-thread TAA attacks.
5685 off - Unconditionally disable TAA mitigation
5687 On MDS-affected machines, tsx_async_abort=off can be
5699 Documentation/admin-guide/hw-vuln/tsx_async_abort.rst
5705 See also Documentation/input/devices/joystick-parport.rst
5707 udbg-immortal [PPC] When debugging early kernel crashes that
5713 Set number of hash buckets for UDP/UDP-Lite connections
5715 uhci-hcd.ignore_oc=
5717 Some badly-designed motherboards generate lots of
5728 (default -1 = authorized except for wireless USB,
5734 for newly-detected USB devices (default 2). This
5762 [USB] Specifies timeout for the initial 64-byte
5769 [USB] A list of quirk entries to augment the built-in
5772 VendorID:ProductID:Flags. The IDs are 4-digit hex
5774 will change the built-in quirk; setting it if it is
5779 a 255-byte read);
5783 Set-Interface requests);
5802 (bInterval-1).
5837 usb-storage.delay_use=
5841 usb-storage.quirks=
5843 override the built-in unusual_devs list. List
5846 and Product ID values (4-digit hex numbers) and
5848 to a common usb-storage quirk flag as follows:
5890 medium is write-protected).
5899 1 - undefined instruction events
5900 2 - system calls
5901 4 - invalid data aborts
5902 8 - SIGSEGV faults
5903 16 - SIGBUS faults
5919 vdso32= [X86] Control the 32-bit vDSO
5920 vdso32=1: enable 32-bit VDSO
5921 vdso32=0 or vdso32=2: disable 32-bit VDSO
5931 dl_main: Assertion `(void *) ph->p_vaddr == _rtld_local._dl_sysinfo_dso' failed!
5933 vector= [IA-64,SMP]
5964 vga= [BOOT,X86-32] Select a particular video mode
5966 Documentation/admin-guide/svga.rst.
5981 - Disable all of the above options
6002 vsyscall= [X86-64]
6005 code). Most statically-linked binaries and older
6029 see VGA-softcursor.txt. Default: 2 = underline.
6034 This is a 16-member array composed of values
6035 ranging from 0-255.
6040 This is a 16-member array composed of values
6041 ranging from 0-255.
6046 This is a 16-member array composed of values
6047 ranging from 0-255.
6052 Set system-wide default UTF-8 mode for all tty's.
6053 Default is 1, i.e. UTF-8 mode is enabled for all
6058 Format=<-1|0|1>
6059 Set system-wide default for whether a cursor
6060 is shown on new VTs. Default is -1,
6065 vt.italic= [VT] Default color for italic text; 0-15.
6068 vt.underline= [VT] Default color for underlined text; 0-15.
6072 see Documentation/watchdog/watchdog-parameters.rst
6073 or other driver-specific files in the
6099 that this also can be controlled per-workqueue for
6103 Per-cpu workqueues are generally preferred because
6105 locality; unfortunately, per-cpu workqueues tend to
6108 Enabling this makes the per-cpu workqueues which
6123 forces round-robin CPU selection to flush out
6128 x2apic_phys [X86-64,APIC] Use x2apic physical mode instead of
6132 x86_intel_mid_timer= [X86-32,APBT]
6138 xen_512gb_limit [KNL,X86-64,XEN]
6148 ide-disks -- unplug primary master IDE devices
6149 aux-ide-disks -- unplug non-primary-master IDE devices
6150 nics -- unplug network devices
6151 all -- unplug all emulated devices (NICs and IDE disks)
6152 unnecessary -- unplugging emulated devices is
6155 never -- do not unplug even if version check succeeds
6182 xen_timer_slop= [X86-64,XEN]
6207 preferred over the 2-level event handling, as it is
6234 xhci-hcd.quirks [USB,KNL]