1 files changed, 26 insertions, 3 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 4609e81dbc37..8ccbf27aead4 100644
--- 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.