Commit f2d34fd9 authored by Will Drewry's avatar Will Drewry Committed by Linus Torvalds
Browse files

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: default avatarWill 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 2af14162

Documentation/frv/booting.txt

+10 −3
Original line number Original line Diff line number Diff line
@@ -106,13 +106,20 @@ separated by spaces: 
      To use the first on-chip serial port at baud rate 115200, no parity, 8

      To use the first on-chip serial port at baud rate 115200, no parity, 8

      bits, and no flow control.

      bits, and no flow control.





  (*) root=/dev/<xxxx>

  (*) root=<xxxx>





      This specifies the device upon which the root filesystem resides. For

      This specifies the device upon which the root filesystem resides. It

      example:

      may be specified by major and minor number, device path, or even

      partition uuid, if supported.  For example:





	/dev/nfs	NFS root filesystem

	/dev/nfs	NFS root filesystem

	/dev/mtdblock3	Fourth RedBoot partition on the System Flash

	/dev/mtdblock3	Fourth RedBoot partition on the System Flash

	PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF/PARTNROFF=1

		first partition after the partition with the given UUID

	253:0		Device with major 253 and minor 0



      Authoritative information can be found in

      "Documentation/kernel-parameters.txt".





  (*) rw

  (*) rw

Documentation/kernel-parameters.txt

+1 −0
Original line number Original line Diff line number Diff line
@@ -2245,6 +2245,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted. 
	ro		[KNL] Mount root device read-only on boot

	ro		[KNL] Mount root device read-only on boot





	root=		[KNL] Root filesystem

	root=		[KNL] Root filesystem

			See name_to_dev_t comment in init/do_mounts.c.





	rootdelay=	[KNL] Delay (in seconds) to pause before attempting to

	rootdelay=	[KNL] Delay (in seconds) to pause before attempting to

			mount the root filesystem

			mount the root filesystem

Documentation/m68k/kernel-options.txt

+14 −0
Original line number Original line Diff line number Diff line
@@ -129,6 +129,20 @@ decimal 11 is the major of SCSI CD-ROMs, and the minor 0 stands for 
the first of these. You can find out all valid major numbers by

the first of these. You can find out all valid major numbers by

looking into include/linux/major.h.

looking into include/linux/major.h.





In addition to major and minor numbers, if the device containing your

root partition uses a partition table format with unique partition

identifiers, then you may use them.  For instance,

"root=PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF".  It is also

possible to reference another partition on the same device using a

known partition UUID as the starting point.  For example,

if partition 5 of the device has the UUID of

00112233-4455-6677-8899-AABBCCDDEEFF then partition 3 may be found as

follows:

  PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF/PARTNROFF=-2



Authoritative information can be found in

"Documentation/kernel-parameters.txt".







2.2) ro, rw

2.2) ro, rw

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