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Subject[PATCH v3 2/2] Documentation: add pointer to name_to_dev_t for root= values
Date
Updates 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>
---
Documentation/frv/booting.txt | 13 ++++++++++---
Documentation/kernel-parameters.txt | 1 +
Documentation/m68k/kernel-options.txt | 14 ++++++++++++++
3 files changed, 25 insertions(+), 3 deletions(-)

diff --git a/Documentation/frv/booting.txt b/Documentation/frv/booting.txt
index ace200b..37c4d84 100644
--- a/Documentation/frv/booting.txt
+++ b/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 --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index fd248a3..c8e1737 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -2234,6 +2234,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
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 --git a/Documentation/m68k/kernel-options.txt b/Documentation/m68k/kernel-options.txt
index c93bed6..97d45f2 100644
--- a/Documentation/m68k/kernel-options.txt
+++ b/Documentation/m68k/kernel-options.txt
@@ -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
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
-----------
--
1.7.0.4


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