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Subject[PATCH] partitions/efi: complete gpt kernel param purpose
From: Davidlohr Bueso <>

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.

Signed-off-by: Davidlohr Bueso <>
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 50680a5..1e353a4 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1013,7 +1013,9 @@ 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.

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