From 6c5de79ba22bbde9a3cfc7b405140763a7252410 Mon Sep 17 00:00:00 2001 From: Davidlohr Bueso Date: Thu, 23 Jan 2014 15:56:03 -0800 Subject: [PATCH] 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 Cc: Matt Domsch Cc: Matt Fleming Cc: "Chandramouleeswaran,Aswin" Cc: Chris Murphy Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- Documentation/kernel-parameters.txt | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) 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. -- 2.39.2