projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | AMD64 specific boot options |
| 2 | ||
| 3 | There are many others (usually documented in driver documentation), but | |
| 4 | only the AMD64 specific ones are listed here. | |
| 5 | ||
| 6 | Machine check | |
| 7 | ||
| 8 | mce=off disable machine check | |
| 9 | ||
| 10 | nomce (for compatibility with i386): same as mce=off | |
| 11 | ||
| 12 | Everything else is in sysfs now. | |
| 13 | ||
| 14 | APICs | |
| 15 | ||
| 16 | apic Use IO-APIC. Default | |
| 17 | ||
| 18 | noapic Don't use the IO-APIC. | |
| 19 | ||
| 20 | disableapic Don't use the local APIC | |
| 21 | ||
| 22 | nolapic Don't use the local APIC (alias for i386 compatibility) | |
| 23 | ||
| 24 | pirq=... See Documentation/i386/IO-APIC.txt | |
| 25 | ||
| 26 | noapictimer Don't set up the APIC timer | |
| 27 | ||
| 28 | Early Console | |
| 29 | ||
| 30 | syntax: earlyprintk=vga | |
| 31 | earlyprintk=serial[,ttySn[,baudrate]] | |
| 32 | ||
| 33 | The early console is useful when the kernel crashes before the | |
| 34 | normal console is initialized. It is not enabled by | |
| 35 | default because it has some cosmetic problems. | |
| 36 | Append ,keep to not disable it when the real console takes over. | |
| 37 | Only vga or serial at a time, not both. | |
| 38 | Currently only ttyS0 and ttyS1 are supported. | |
| 39 | Interaction with the standard serial driver is not very good. | |
| 40 | The VGA output is eventually overwritten by the real console. | |
| 41 | ||
| 42 | Timing | |
| 43 | ||
| 44 | notsc | |
| 45 | Don't use the CPU time stamp counter to read the wall time. | |
| 46 | This can be used to work around timing problems on multiprocessor systems | |
| 47 | with not properly synchronized CPUs. Only useful with a SMP kernel | |
| 48 | ||
| 49 | report_lost_ticks | |
| 50 | Report when timer interrupts are lost because some code turned off | |
| 51 | interrupts for too long. | |
| 52 | ||
| 53 | nmi_watchdog=NUMBER[,panic] | |
| 54 | NUMBER can be: | |
| 55 | 0 don't use an NMI watchdog | |
| 56 | 1 use the IO-APIC timer for the NMI watchdog | |
| 57 | 2 use the local APIC for the NMI watchdog using a performance counter. Note | |
| 58 | This will use one performance counter and the local APIC's performance | |
| 59 | vector. | |
| 60 | When panic is specified panic when an NMI watchdog timeout occurs. | |
| 61 | This is useful when you use a panic=... timeout and need the box | |
| 62 | quickly up again. | |
| 63 | ||
| 64 | nohpet | |
| 65 | Don't use the HPET timer. | |
| 66 | ||
| 67 | Idle loop | |
| 68 | ||
| 69 | idle=poll | |
| 70 | Don't do power saving in the idle loop using HLT, but poll for rescheduling | |
| 71 | event. This will make the CPUs eat a lot more power, but may be useful | |
| 72 | to get slightly better performance in multiprocessor benchmarks. It also | |
| 73 | makes some profiling using performance counters more accurate. | |
| 74 | ||
| 75 | Rebooting | |
| 76 | ||
| 77 | reboot=b[ios] | t[riple] | k[bd] [, [w]arm | [c]old] | |
| 78 | bios Use the CPU reboto vector for warm reset | |
| 79 | warm Don't set the cold reboot flag | |
| 80 | cold Set the cold reboot flag | |
| 81 | triple Force a triple fault (init) | |
| 82 | kbd Use the keyboard controller. cold reset (default) | |
| 83 | ||
| 84 | Using warm reset will be much faster especially on big memory | |
| 85 | systems because the BIOS will not go through the memory check. | |
| 86 | Disadvantage is that not all hardware will be completely reinitialized | |
| 87 | on reboot so there may be boot problems on some systems. | |
| 88 | ||
| 89 | reboot=force | |
| 90 | ||
| 91 | Don't stop other CPUs on reboot. This can make reboot more reliable | |
| 92 | in some cases. | |
| 93 | ||
| 94 | Non Executable Mappings | |
| 95 | ||
| 96 | noexec=on|off | |
| 97 | ||
| 98 | on Enable(default) | |
| 99 | off Disable | |
| 100 | ||
| 101 | SMP | |
| 102 | ||
| 103 | nosmp Only use a single CPU | |
| 104 | ||
| 105 | maxcpus=NUMBER only use upto NUMBER CPUs | |
| 106 | ||
| 107 | cpumask=MASK only use cpus with bits set in mask | |
| 108 | ||
| 109 | NUMA | |
| 110 | ||
| 111 | numa=off Only set up a single NUMA node spanning all memory. | |
| 112 | ||
| 113 | numa=noacpi Don't parse the SRAT table for NUMA setup | |
| 114 | ||
| 115 | numa=fake=X Fake X nodes and ignore NUMA setup of the actual machine. | |
| 116 | ||
| 117 | ACPI | |
| 118 | ||
| 119 | acpi=off Don't enable ACPI | |
| 120 | acpi=ht Use ACPI boot table parsing, but don't enable ACPI | |
| 121 | interpreter | |
| 122 | acpi=force Force ACPI on (currently not needed) | |
| 123 | ||
| 124 | acpi=strict Disable out of spec ACPI workarounds. | |
| 125 | ||
| 126 | acpi_sci={edge,level,high,low} Set up ACPI SCI interrupt. | |
| 127 | ||
| 128 | acpi=noirq Don't route interrupts | |
| 129 | ||
| 130 | PCI | |
| 131 | ||
| 132 | pci=off Don't use PCI | |
| 133 | pci=conf1 Use conf1 access. | |
| 134 | pci=conf2 Use conf2 access. | |
| 135 | pci=rom Assign ROMs. | |
| 136 | pci=assign-busses Assign busses | |
| 137 | pci=irqmask=MASK Set PCI interrupt mask to MASK | |
| 138 | pci=lastbus=NUMBER Scan upto NUMBER busses, no matter what the mptable says. | |
| 139 | pci=noacpi Don't use ACPI to set up PCI interrupt routing. | |
| 140 | ||
| 141 | IOMMU | |
| 142 | ||
| 143 | iommu=[size][,noagp][,off][,force][,noforce][,leak][,memaper[=order]][,merge] | |
| 144 | [,forcesac][,fullflush][,nomerge][,noaperture] | |
| 145 | size set size of iommu (in bytes) | |
| 146 | noagp don't initialize the AGP driver and use full aperture. | |
| 147 | off don't use the IOMMU | |
| 148 | leak turn on simple iommu leak tracing (only when CONFIG_IOMMU_LEAK is on) | |
| 149 | memaper[=order] allocate an own aperture over RAM with size 32MB^order. | |
| 150 | noforce don't force IOMMU usage. Default. | |
| 151 | force Force IOMMU. | |
| 152 | merge Do SG merging. Implies force (experimental) | |
| 153 | nomerge Don't do SG merging. | |
| 154 | forcesac For SAC mode for masks <40bits (experimental) | |
| 155 | fullflush Flush IOMMU on each allocation (default) | |
| 156 | nofullflush Don't use IOMMU fullflush | |
| 157 | allowed overwrite iommu off workarounds for specific chipsets. | |
| 158 | soft Use software bounce buffering (default for Intel machines) | |
| 159 | noaperture Don't touch the aperture for AGP. | |
| 160 | ||
| 161 | swiotlb=pages[,force] | |
| 162 | ||
| 163 | pages Prereserve that many 128K pages for the software IO bounce buffering. | |
| 164 | force Force all IO through the software TLB. | |
| 165 | ||
| 166 | Debugging | |
| 167 | ||
| 168 | oops=panic Always panic on oopses. Default is to just kill the process, | |
| 169 | but there is a small probability of deadlocking the machine. | |
| 170 | This will also cause panics on machine check exceptions. | |
| 171 | Useful together with panic=30 to trigger a reboot. | |
| 172 | ||
| 173 | kstack=N Print that many words from the kernel stack in oops dumps. | |
| 174 | ||
| 175 | Misc | |
| 176 | ||
| 177 | noreplacement Don't replace instructions with more appropiate ones | |
| 178 | for the CPU. This may be useful on asymmetric MP systems | |
| 179 | where some CPU have less capabilities than the others. | |
| 180 |