ide-floppy: convert ide_do_drive_cmd path to use blk_execute_rq

[linux-2.6-omap-h63xx.git] / Documentation / kdump / kdump.txt

diff --git a/Documentation/kdump/kdump.txt b/Documentation/kdump/kdump.txt
index 1b37b28cc2343b82a7150d8c74724f4d2ecb8e7f..b8e52c0355d3bab81760adbf62d0c8a06a9ba52a 100644 (file)
--- a/Documentation/kdump/kdump.txt
+++ b/Documentation/kdump/kdump.txt
@@ -231,6 +231,35 @@ Dump-capture kernel config options (Arch Dependent, ia64)
   any space below the alignment point will be wasted.
 
 
+Extended crashkernel syntax
+===========================
+
+While the "crashkernel=size[@offset]" syntax is sufficient for most
+configurations, sometimes it's handy to have the reserved memory dependent
+on the value of System RAM -- that's mostly for distributors that pre-setup
+the kernel command line to avoid a unbootable system after some memory has
+been removed from the machine.
+
+The syntax is:
+
+    crashkernel=<range1>:<size1>[,<range2>:<size2>,...][@offset]
+    range=start-[end]
+
+    'start' is inclusive and 'end' is exclusive.
+
+For example:
+
+    crashkernel=512M-2G:64M,2G-:128M
+
+This would mean:
+
+    1) if the RAM is smaller than 512M, then don't reserve anything
+       (this is the "rescue" case)
+    2) if the RAM size is between 512M and 2G (exclusive), then reserve 64M
+    3) if the RAM size is larger than 2G, then reserve 128M
+
+
+
 Boot into System Kernel
 =======================