patch-2.4.22 linux-2.4.22/Documentation/x86_64/boot-options.txt

• Lines: 152
• Date: 2003-08-25 04:44:39.000000000 -0700
• Orig file: linux-2.4.21/Documentation/x86_64/boot-options.txt
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.21/Documentation/x86_64/boot-options.txt linux-2.4.22/Documentation/x86_64/boot-options.txt
@@ -0,0 +1,151 @@
+AMD64 specific boot options
+
+There are many others (usually documented in driver documentation), but 
+only the AMD64 specific ones are listed here.
+
+Machine check
+
+(see the Opteron BIOS&Kernel manual for more details on the banks etc.)
+
+   mce=off disable machine check
+   mce=nok8 disable k8 specific features
+   mce=disable<NUMBER> disable bank NUMBER
+   mce=enable<NUMBER> enable bank number
+   mce=device	Enable more machine check options in Northbridge. 
+		Can be useful for device driver debugging.
+   mce=NUMBER mcheck timer interval number seconds. 
+   Can be also comma separated in a single mce=
+
+   nomce (for compatibility with i386): same as mce=off
+
+APICs
+
+   nolocalapic   Don't use a local or IO-APIC. This should only
+   		 be needed if you have a buggy BIOS. The newer
+		 kernels already turn it off by default if the
+		 BIOS didn't enable the local APIC, so it will
+		 be hopefully not needed.
+		 Note this code path is not very well tested, you are on
+		 your own.
+		
+   apic		 Use IO-APIC. Default
+
+   noapic	 Don't use the IO-APIC. 
+		 Also only lightly tested. 
+
+   pirq=...	 See Documentation/i386/IO-APIC.txt		 
+    
+Early Console
+
+   syntax: earlyprintk=vga
+           earlyprintk=serial[,ttySn[,baudrate]] 
+
+   The early console is useful when the kernel crashes before the
+   normal console is initialized. It is not enabled by 
+   default because it has some cosmetic problems.	   
+   Append ,keep to not disable it when the real console takes over.
+   Only vga or serial at a time, not both.
+   Currently only ttyS0 and ttyS1 are supported. 
+   Interaction with the standard serial driver is not very good. 
+   The VGA output is eventually overwritten by the real console.		 
+
+Timing
+
+  notsc
+  Don't use the CPU time stamp counter to read the wall time. 
+  This can be used to work around timing problems on multiprocessor systems 
+  with not properly synchronized CPUs. Only useful with a SMP kernel
+
+  report_lost_ticks
+  Report when timer interrupts are lost because some code turned off
+  interrupts for too long. 
+
+  nmi_watchdog=NUMBER
+  NUMBER can be: 
+  0 don't use an NMI watchdog
+  1 use the IO-APIC timer for the NMI watchdog
+  2 use the local APIC for the NMI watchdog using a performance counter. Note
+  This will use one performance counter.
+
+Idle loop
+
+  idle=poll
+  Don't do power saving in the idle loop using HLT, but poll for rescheduling 
+  event. This will make the CPUs eat a lot more power, but may be useful 
+  to get slightly better performance in multiprocessor benchmarks. It also
+  makes some profiling using performance counters more accurate.
+
+Rebooting
+
+   reboot=b[ios] | t[riple] | k[bd] [, [w]arm | [c]old]
+   bios	  Use the CPU reboto vector for warm reset
+   warm   Don't set the cold reboot flag
+   cold   Set the cold reboto flag
+   triple Force a triple fault (init)
+   kbd    Use the keyboard controller. cold reset (default)
+
+   Using warm reset will be much faster especially on big memory
+   systems because the BIOS will not go through the memory check.
+   Disadvantage is that not all hardware will be completely reinitialized
+   on reboot so there may be boot problems on some systems.
+   
+Non Executable Mappings
+
+  noexec=on|off
+
+  on      Enable
+  off     Disable
+  noforce (default) Don't enable by default for heap/stack/data,
+          but allow PROT_EXEC to be effective
+
+  noexec32=opt{,opt} 
+
+  Control the no exec default for 32bit processes. 
+  Requires noexec=on or noexec=noforce to be effective.
+
+  Valid options: 
+     all,on    Heap,stack,data is non executable. 	
+     off       (default) Heap,stack,data is executable
+     stack     Stack is non executable, heap/data is.
+     force     Don't imply PROT_EXEC for PROT_READ 
+     compat    (default) Imply PROT_EXEC for PROT_READ
+ 
+SMP 
+
+  nosmp	Only use a single CPU
+
+  maxcpus=NUMBER only use upto NUMBER CPUs
+
+  cpumask=MASK   only use cpus with bits set in mask
+
+NUMA
+
+  numa=off	Only set up a single NUMA node spanning all memory.
+
+
+ACPI 
+
+  acpi=off	Don't enable ACPI
+  
+PCI
+
+  pci=off	Don't use PCI
+  pci=conf1	Use conf1 access.
+  pci=conf2	Use conf2 access.
+  pci=rom	Assign ROMs.
+  pci=assign-busses    Assign busses
+  pci=irqmask=MASK	       Set PCI interrupt mask to MASK
+  pci=lastbus=NUMBER	       Scan upto NUMBER busses, no matter what the mptable says.
+
+IOMMU
+
+  iommu=[size][,noagp][,off][,force][,noforce][,leak][,memaper[=order]]
+   size  set size of iommu (in bytes) 
+   noagp don't initialize the AGP driver and use full aperture.
+   off   don't use the IOMMU
+   leak  turn on simple iommu leak tracing (only when CONFIG_IOMMU_LEAK is on)
+   memaper[=order] allocate an own aperture over RAM with size 32MB^order.
+   noforce don't force IOMMU usage. Should be fastest.
+   force  Force IOMMU and turn on unmap debugging.  
+
+