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authorDavidlohr Bueso <davidlohr@hp.com>2014-01-23 15:56:03 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2014-01-23 16:37:03 -0800
commit6c5de79ba22bbde9a3cfc7b405140763a7252410 (patch)
treea42b2e19ee547e6b1b8447c2c6b6765ce8e5574c
parentbdd490ade365b1173485b829e5457af8e16c7f01 (diff)
partitions/efi: complete documentation of gpt kernel param purpose
The usage of the 'gpt' kernel parameter is twofold: (i) skip any mbr integrity checks and (ii) enable the backup GPT header to be used in situations where the primary one is corrupted. This last "feature" is not obvious and needs to be properly documented in the kernel-parameters document. Addresses https://bugzilla.kernel.org/show_bug.cgi?id=63591 Signed-off-by: Davidlohr Bueso <davidlohr@hp.com> Cc: Matt Domsch <Matt_Domsch@dell.com> Cc: Matt Fleming <matt.fleming@intel.com> Cc: "Chandramouleeswaran,Aswin" <aswin@hp.com> Cc: Chris Murphy <bugzilla@colorremedies.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--Documentation/kernel-parameters.txt4
1 files changed, 3 insertions, 1 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 5efebfd1cfdf..248fe9da0b26 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1043,7 +1043,9 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
debugfs files are removed at module unload time.
gpt [EFI] Forces disk with valid GPT signature but
- invalid Protective MBR to be treated as GPT.
+ invalid Protective MBR to be treated as GPT. If the
+ primary GPT is corrupted, it enables the backup/alternate
+ GPT to be used instead.
grcan.enable0= [HW] Configuration of physical interface 0. Determines
the "Enable 0" bit of the configuration register.