The patch titled
Documentation: add pointer to name_to_dev_t for root= values
has been added to the -mm tree. Its filename is
documentation-add-pointer-to-name_to_dev_t-for-root=-values.patch
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------------------------------------------------------
Subject: Documentation: add pointer to name_to_dev_t for root= values
From: Will Drewry <wad@xxxxxxxxxxxx>
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@xxxxxxxxxxxx>
Cc: Kay Sievers <kay.sievers@xxxxxxxx>
Cc: Randy Dunlap <rdunlap@xxxxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxx>
Cc: Trond Myklebust <Trond.Myklebust@xxxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/frv/booting.txt | 13 ++++++++++---
Documentation/kernel-parameters.txt | 1 +
Documentation/m68k/kernel-options.txt | 14 ++++++++++++++
3 files changed, 25 insertions(+), 3 deletions(-)
diff -puN Documentation/frv/booting.txt~documentation-add-pointer-to-name_to_dev_t-for-root=-values Documentation/frv/booting.txt
--- a/Documentation/frv/booting.txt~documentation-add-pointer-to-name_to_dev_t-for-root=-values
+++ a/Documentation/frv/booting.txt
@@ -106,13 +106,20 @@ separated by spaces:
To use the first on-chip serial port at baud rate 115200, no parity, 8
bits, and no flow control.
- (*) root=/dev/<xxxx>
+ (*) root=<xxxx>
- This specifies the device upon which the root filesystem resides. For
- example:
+ This specifies the device upon which the root filesystem resides. It
+ may be specified by major and minor number, device path, or even
+ partition uuid, if supported. For example:
/dev/nfs NFS root filesystem
/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
diff -puN Documentation/kernel-parameters.txt~documentation-add-pointer-to-name_to_dev_t-for-root=-values Documentation/kernel-parameters.txt
--- a/Documentation/kernel-parameters.txt~documentation-add-pointer-to-name_to_dev_t-for-root=-values
+++ a/Documentation/kernel-parameters.txt
@@ -2234,6 +2234,7 @@ bytes respectively. Such letter suffixes
ro [KNL] Mount root device read-only on boot
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
mount the root filesystem
diff -puN Documentation/m68k/kernel-options.txt~documentation-add-pointer-to-name_to_dev_t-for-root=-values Documentation/m68k/kernel-options.txt
--- a/Documentation/m68k/kernel-options.txt~documentation-add-pointer-to-name_to_dev_t-for-root=-values
+++ a/Documentation/m68k/kernel-options.txt
@@ -129,6 +129,20 @@ decimal 11 is the major of SCSI CD-ROMs,
the first of these. You can find out all valid major numbers by
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
-----------
_
Patches currently in -mm which might be from wad@xxxxxxxxxxxx are
init-add-root=partuuid=uuid-partnroff=%d-support.patch
documentation-add-pointer-to-name_to_dev_t-for-root=-values.patch
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