diff options
Diffstat (limited to 'Documentation/kernel-parameters.txt')
| -rw-r--r-- | Documentation/kernel-parameters.txt | 62 |
1 files changed, 26 insertions, 36 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 766087781ec..3a54fca730c 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -564,6 +564,8 @@ bytes respectively. Such letter suffixes can also be entirely omitted. UART at the specified I/O port or MMIO address, switching to the matching ttyS device later. The options are the same as for ttyS, above. + hvc<n> Use the hypervisor console device <n>. This is for + both Xen and PowerPC hypervisors. If the device connected to the port is not a TTY but a braille device, prepend "brl," before the device type, for instance @@ -757,6 +759,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted. earlyprintk= [X86,SH,BLACKFIN] earlyprintk=vga + earlyprintk=xen earlyprintk=serial[,ttySn[,baudrate]] earlyprintk=ttySn[,baudrate] earlyprintk=dbgp[debugController#] @@ -774,6 +777,8 @@ bytes respectively. Such letter suffixes can also be entirely omitted. The VGA output is eventually overwritten by the real console. + The xen output can only be used by Xen PV guests. + ekgdboc= [X86,KGDB] Allow early kernel console debugging ekgdboc=kbd @@ -1640,42 +1645,6 @@ bytes respectively. Such letter suffixes can also be entirely omitted. that the amount of memory usable for all allocations is not too small. - movablemem_map=acpi - [KNL,X86,IA-64,PPC] This parameter is similar to - memmap except it specifies the memory map of - ZONE_MOVABLE. - This option inform the kernel to use Hot Pluggable bit - in flags from SRAT from ACPI BIOS to determine which - memory devices could be hotplugged. The corresponding - memory ranges will be set as ZONE_MOVABLE. - NOTE: Whatever node the kernel resides in will always - be un-hotpluggable. - - movablemem_map=nn[KMG]@ss[KMG] - [KNL,X86,IA-64,PPC] This parameter is similar to - memmap except it specifies the memory map of - ZONE_MOVABLE. - If user specifies memory ranges, the info in SRAT will - be ingored. And it works like the following: - - If more ranges are all within one node, then from - lowest ss to the end of the node will be ZONE_MOVABLE. - - If a range is within a node, then from ss to the end - of the node will be ZONE_MOVABLE. - - If a range covers two or more nodes, then from ss to - the end of the 1st node will be ZONE_MOVABLE, and all - the rest nodes will only have ZONE_MOVABLE. - If memmap is specified at the same time, the - movablemem_map will be limited within the memmap - areas. If kernelcore or movablecore is also specified, - movablemem_map will have higher priority to be - satisfied. So the administrator should be careful that - the amount of movablemem_map areas are not too large. - Otherwise kernel won't have enough memory to start. - NOTE: We don't stop users specifying the node the - kernel resides in as hotpluggable so that this - option can be used as a workaround of firmware - bugs. - MTD_Partition= [MTD] Format: <name>,<region-number>,<size>,<offset> @@ -2262,6 +2231,21 @@ bytes respectively. Such letter suffixes can also be entirely omitted. This sorting is done to get a device order compatible with older (<= 2.4) kernels. nobfsort Don't sort PCI devices into breadth-first order. + pcie_bus_tune_off Disable PCIe MPS (Max Payload Size) + tuning and use the BIOS-configured MPS defaults. + pcie_bus_safe Set every device's MPS to the largest value + supported by all devices below the root complex. + pcie_bus_perf Set device MPS to the largest allowable MPS + based on its parent bus. Also set MRRS (Max + Read Request Size) to the largest supported + value (no larger than the MPS that the device + or bus can support) for best performance. + pcie_bus_peer2peer Set every device's MPS to 128B, which + every device is guaranteed to support. This + configuration allows peer-to-peer DMA between + any pair of devices, possibly at the cost of + reduced performance. This also guarantees + that hot-added devices will work. cbiosize=nn[KMG] The fixed amount of bus space which is reserved for the CardBus bridge's IO window. The default value is 256 bytes. @@ -2283,6 +2267,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted. the default. off: Turn ECRC off on: Turn ECRC on. + hpiosize=nn[KMG] The fixed amount of bus space which is + reserved for hotplug bridge's IO window. + Default size is 256 bytes. + hpmemsize=nn[KMG] The fixed amount of bus space which is + reserved for hotplug bridge's memory window. + Default size is 2 megabytes. realloc= Enable/disable reallocating PCI bridge resources if allocations done by BIOS are too small to accommodate resources required by all child |