X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=Documentation%2Ffilesystems%2Fefivarfs.txt;h=686a64bba775e0af9990cf305ab81f1ac4c8c278;hb=5a3b0cd52ee38b67fc01b1c8dd843cfcbe03a5e9;hp=c477af086e6569398d85b3f938e9f067b1976f7e;hpb=e29371d762df5bb35d2bc434ea266a046e5a0a75;p=firefly-linux-kernel-4.4.55.git

diff --git a/Documentation/filesystems/efivarfs.txt b/Documentation/filesystems/efivarfs.txt
index c477af086e65..686a64bba775 100644
--- a/Documentation/filesystems/efivarfs.txt
+++ b/Documentation/filesystems/efivarfs.txt
@@ -14,3 +14,10 @@ filesystem.
 efivarfs is typically mounted like this,
 
 	mount -t efivarfs none /sys/firmware/efi/efivars
+
+Due to the presence of numerous firmware bugs where removing non-standard
+UEFI variables causes the system firmware to fail to POST, efivarfs
+files that are not well-known standardized variables are created
+as immutable files.  This doesn't prevent removal - "chattr -i" will work -
+but it does prevent this kind of failure from being accomplished
+accidentally.