Merge branches 'iommu/fixes', 'x86/vt-d', 'x86/amd', 'ppc/pamu', 'core' and 'arm...

[uclinux-h8/linux.git] / Documentation / kernel-parameters.txt

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 4609e81..47bb23c 100644 (file)
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -596,9 +596,6 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
                        is selected automatically. Check
                        Documentation/kdump/kdump.txt for further details.
 
-       crashkernel_low=size[KMG]
-                       [KNL, x86] parts under 4G.
-
        crashkernel=range1:size1[,range2:size2,...][@offset]
                        [KNL] Same as above, but depends on the memory
                        in the running system. The syntax of range is
@@ -606,6 +603,26 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
                        a memory unit (amount[KMG]). See also
                        Documentation/kdump/kdump.txt for an example.
 
+       crashkernel=size[KMG],high
+                       [KNL, x86_64] range could be above 4G. Allow kernel
+                       to allocate physical memory region from top, so could
+                       be above 4G if system have more than 4G ram installed.
+                       Otherwise memory region will be allocated below 4G, if
+                       available.
+                       It will be ignored if crashkernel=X is specified.
+       crashkernel=size[KMG],low
+                       [KNL, x86_64] range under 4G. When crashkernel=X,high
+                       is passed, kernel could allocate physical memory region
+                       above 4G, that cause second kernel crash on system
+                       that require some amount of low memory, e.g. swiotlb
+                       requires at least 64M+32K low memory.  Kernel would
+                       try to allocate 72M below 4G automatically.
+                       This one let user to specify own low range under 4G
+                       for second kernel instead.
+                       0: to disable low allocation.
+                       It will be ignored when crashkernel=X,high is not used
+                       or memory reserved is below 4G.
+
        cs89x0_dma=     [HW,NET]
                        Format: <dma>
 
@@ -788,6 +805,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
        edd=            [EDD]
                        Format: {"off" | "on" | "skip[mbr]"}
 
+       efi_no_storage_paranoia [EFI; X86]
+                       Using this parameter you can use more than 50% of
+                       your efi variable storage. Use this parameter only if
+                       you are really sure that your UEFI does sane gc and
+                       fulfills the spec otherwise your board may brick.
+
        eisa_irq_edge=  [PARISC,HW]
                        See header of drivers/parisc/eisa.c.
 
@@ -1226,6 +1249,20 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 
        iucv=           [HW,NET]
 
+       ivrs_ioapic     [HW,X86_64]
+                       Provide an override to the IOAPIC-ID<->DEVICE-ID
+                       mapping provided in the IVRS ACPI table. For
+                       example, to map IOAPIC-ID decimal 10 to
+                       PCI device 00:14.0 write the parameter as:
+                               ivrs_ioapic[10]=00:14.0
+
+       ivrs_hpet       [HW,X86_64]
+                       Provide an override to the HPET-ID<->DEVICE-ID
+                       mapping provided in the IVRS ACPI table. For
+                       example, to map HPET-ID decimal 0 to
+                       PCI device 00:14.0 write the parameter as:
+                               ivrs_hpet[0]=00:14.0
+
        js=             [HW,JOY] Analog joystick
                        See Documentation/input/joystick.txt.