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sfdisk: (docs) add more information about GPT attribute bits 

Addresses: https://github.com/karelzak/util-linux/issues/1171
Signed-off-by: Karel Zak <kzak@redhat.com>
This commit is contained in:
Karel Zak 2020-11-04 10:29:30 +01:00
parent 1ab5f9b705
commit ebb5ca72f4
1 changed files with 29 additions and 6 deletions
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35
disk-utils/sfdisk.8
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@ -145,13 +145,36 @@ List the free unpartitioned areas on all or the specified devices.
.TP
.BR "\-\-part\-attrs \fIdevice partition-number " [ \fIattributes ]
Change the GPT partition attribute bits. If \fIattributes\fR is not specified,
then print the current partition settings.
then print the current partition settings. The \fIattributes\fR argument is a
comma- or space-delimited list of bits numbers or bit names. For example, the
string "RequiredPartition,50,51" sets three bits. The currently supported
attribute bits are:
.RS
.TP
.BR "Bit 0 (RequiredPartition)"
If this bit is set, the partition is required for the platform to function. The
creator of the partition indicates that deletion or modification of the contents
can result in loss of platform features or failure for the platform to boot or
operate. The system cannot function normally if this partition is removed, and it
should be considered part of the hardware of the system.
.TP
.BR "Bit 1 (NoBlockIOProtocol)"
EFI firmware should ignore the content of the partition and not try to read from it.
.TP
.BR "Bit 2 (LegacyBIOSBootable)"
The partition may be bootable by legacy BIOS firmware.
.TP
.BR "Bits 3-47"
Undefined and must be zero. Reserved for expansion by future versions of the
UEFI specification.
.TP
.BR "Bits 48-63"
Reserved for GUID specific use. The use of these bits will vary depending on
the partition type. For example Microsoft uses bit 60 to indicate read-only,
61 for shadow copy of another partition, 62 for hidden partitions and 63 to
disable automount.
.RE
.sp
The \fIattributes\fR argument is a
comma- or space-delimited list of bits. The currently supported attribute
bits are: RequiredPartition, NoBlockIOProtocol, LegacyBIOSBootable
and GUID-specific bits in the range from 48 to 63. For example, the string
"RequiredPartition,50,51" sets three bits.
.TP
.BR "\-\-part\-label \fIdevice partition-number " [ \fIlabel ]
Change the GPT partition name (label). If \fIlabel\fR is not specified,