Documentation: add pointer to name_to_dev_t for root= values
Update kernel-parameters.txt to point users to the authoritative comment for name_to_dev_t. In addition, updates other places where some name_to_dev_t behavior was discussed. All other references to root= appear to be for explicit sample usage or just side comments when discussing other kernel parameters. Signed-off-by: Will Drewry <wad@chromium.org> Cc: Kay Sievers <kay.sievers@vrfy.org> Cc: Randy Dunlap <rdunlap@xenotime.net> Cc: Namhyung Kim <namhyung@gmail.com> Cc: Trond Myklebust <Trond.Myklebust@netapp.com> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -106,13 +106,20 @@ separated by spaces:
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To use the first on-chip serial port at baud rate 115200, no parity, 8
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To use the first on-chip serial port at baud rate 115200, no parity, 8
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bits, and no flow control.
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bits, and no flow control.
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(*) root=/dev/<xxxx>
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(*) root=<xxxx>
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This specifies the device upon which the root filesystem resides. For
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This specifies the device upon which the root filesystem resides. It
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example:
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may be specified by major and minor number, device path, or even
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partition uuid, if supported. For example:
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/dev/nfs NFS root filesystem
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/dev/nfs NFS root filesystem
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/dev/mtdblock3 Fourth RedBoot partition on the System Flash
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/dev/mtdblock3 Fourth RedBoot partition on the System Flash
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PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF/PARTNROFF=1
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first partition after the partition with the given UUID
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253:0 Device with major 253 and minor 0
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Authoritative information can be found in
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"Documentation/kernel-parameters.txt".
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(*) rw
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(*) rw
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@ -2245,6 +2245,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
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ro [KNL] Mount root device read-only on boot
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ro [KNL] Mount root device read-only on boot
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root= [KNL] Root filesystem
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root= [KNL] Root filesystem
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See name_to_dev_t comment in init/do_mounts.c.
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rootdelay= [KNL] Delay (in seconds) to pause before attempting to
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rootdelay= [KNL] Delay (in seconds) to pause before attempting to
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mount the root filesystem
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mount the root filesystem
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@ -129,6 +129,20 @@ decimal 11 is the major of SCSI CD-ROMs, and the minor 0 stands for
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the first of these. You can find out all valid major numbers by
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the first of these. You can find out all valid major numbers by
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looking into include/linux/major.h.
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looking into include/linux/major.h.
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In addition to major and minor numbers, if the device containing your
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root partition uses a partition table format with unique partition
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identifiers, then you may use them. For instance,
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"root=PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF". It is also
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possible to reference another partition on the same device using a
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known partition UUID as the starting point. For example,
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if partition 5 of the device has the UUID of
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00112233-4455-6677-8899-AABBCCDDEEFF then partition 3 may be found as
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follows:
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PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF/PARTNROFF=-2
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Authoritative information can be found in
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"Documentation/kernel-parameters.txt".
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2.2) ro, rw
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2.2) ro, rw
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