diff options
Diffstat (limited to 'Documentation/admin-guide/kernel-parameters.txt')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 95 |
1 files changed, 90 insertions, 5 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 1d1d53f85ddd..34dac7cef4cf 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -1025,7 +1025,7 @@ address. The serial port must already be setup and configured. Options are not yet supported. - earlyprintk= [X86,SH,BLACKFIN,ARM,M68k,S390] + earlyprintk= [X86,SH,ARM,M68k,S390] earlyprintk=vga earlyprintk=efi earlyprintk=sclp @@ -1347,10 +1347,6 @@ If specified, z/VM IUCV HVC accepts connections from listed z/VM user IDs only. - hwthread_map= [METAG] Comma-separated list of Linux cpu id to - hardware thread id mappings. - Format: <cpu>:<hwthread> - keep_bootcon [KNL] Do not unregister boot console at start. This is only useful for debugging when something happens in the window @@ -1743,6 +1739,14 @@ of a GICv2 controller even if the memory range exposed by the device tree is too small. + irqchip.gicv3_nolpi= + [ARM, ARM64] + Force the kernel to ignore the availability of + LPIs (and by consequence ITSs). Intended for system + that use the kernel as a bootloader, and thus want + to let secondary kernels in charge of setting up + LPIs. + irqfixup [HW] When an interrupt is not handled search all handlers for it. Intended to get systems with badly broken @@ -1766,6 +1770,17 @@ nohz Disable the tick when a single task runs. + + A residual 1Hz tick is offloaded to workqueues, which you + need to affine to housekeeping through the global + workqueue's affinity configured via the + /sys/devices/virtual/workqueue/cpumask sysfs file, or + by using the 'domain' flag described below. + + NOTE: by default the global workqueue runs on all CPUs, + so to protect individual CPUs the 'cpumask' file has to + be configured manually after bootup. + domain Isolate from the general SMP balancing and scheduling algorithms. Note that performing domain isolation this way @@ -2237,6 +2252,15 @@ The memory region may be marked as e820 type 12 (0xc) and is NVDIMM or ADR memory. + memmap=<size>%<offset>-<oldtype>+<newtype> + [KNL,ACPI] Convert memory within the specified region + from <oldtype> to <newtype>. If "-<oldtype>" is left + out, the whole region will be marked as <newtype>, + even if previously unavailable. If "+<newtype>" is left + out, matching memory will be removed. Types are + specified as e820 types, e.g., 1 = RAM, 2 = reserved, + 3 = ACPI, 12 = PRAM. + memory_corruption_check=0/1 [X86] Some BIOSes seem to corrupt the first 64k of memory when doing things like suspend/resume. @@ -4368,12 +4392,73 @@ usbcore.nousb [USB] Disable the USB subsystem + usbcore.quirks= + [USB] A list of quirk entries to augment the built-in + usb core quirk list. List entries are separated by + commas. Each entry has the form + VendorID:ProductID:Flags. The IDs are 4-digit hex + numbers and Flags is a set of letters. Each letter + will change the built-in quirk; setting it if it is + clear and clearing it if it is set. The letters have + the following meanings: + a = USB_QUIRK_STRING_FETCH_255 (string + descriptors must not be fetched using + a 255-byte read); + b = USB_QUIRK_RESET_RESUME (device can't resume + correctly so reset it instead); + c = USB_QUIRK_NO_SET_INTF (device can't handle + Set-Interface requests); + d = USB_QUIRK_CONFIG_INTF_STRINGS (device can't + handle its Configuration or Interface + strings); + e = USB_QUIRK_RESET (device can't be reset + (e.g morph devices), don't use reset); + f = USB_QUIRK_HONOR_BNUMINTERFACES (device has + more interface descriptions than the + bNumInterfaces count, and can't handle + talking to these interfaces); + g = USB_QUIRK_DELAY_INIT (device needs a pause + during initialization, after we read + the device descriptor); + h = USB_QUIRK_LINEAR_UFRAME_INTR_BINTERVAL (For + high speed and super speed interrupt + endpoints, the USB 2.0 and USB 3.0 spec + require the interval in microframes (1 + microframe = 125 microseconds) to be + calculated as interval = 2 ^ + (bInterval-1). + Devices with this quirk report their + bInterval as the result of this + calculation instead of the exponent + variable used in the calculation); + i = USB_QUIRK_DEVICE_QUALIFIER (device can't + handle device_qualifier descriptor + requests); + j = USB_QUIRK_IGNORE_REMOTE_WAKEUP (device + generates spurious wakeup, ignore + remote wakeup capability); + k = USB_QUIRK_NO_LPM (device can't handle Link + Power Management); + l = USB_QUIRK_LINEAR_FRAME_INTR_BINTERVAL + (Device reports its bInterval as linear + frames instead of the USB 2.0 + calculation); + m = USB_QUIRK_DISCONNECT_SUSPEND (Device needs + to be disconnected before suspend to + prevent spurious wakeup); + n = USB_QUIRK_DELAY_CTRL_MSG (Device needs a + pause after every control message); + Example: quirks=0781:5580:bk,0a5c:5834:gij + usbhid.mousepoll= [USBHID] The interval which mice are to be polled at. usbhid.jspoll= [USBHID] The interval which joysticks are to be polled at. + usbhid.kbpoll= + [USBHID] The interval which keyboards are to be polled at. + usb-storage.delay_use= [UMS] The delay in seconds before a new device is scanned for Logical Units (default 1). |