RE: How to mount romfs in flash as root filesystem?

Hmm,

I have mounted my root filesystem as cramfs, jffs2 and even ext2 at one
point.
Currently I am using jffs2 and cramfs in some boards.

Kernel version 2.4.19-pre6.

K.D.

-----Original Message-----
From: Dross Zhou [mailto:zjuzhou@yahoo.com.cn]
Sent: 2. maí 2002 11:57
To: K�ri Dav眇sson
Cc: linuxppc-embedded@lists.linuxppc.org
Subject: RE: How to mount romfs in flash as root filesystem?



I have compiled it into kernel,not module,it is romfs.

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What file system do you have on your flash?
Is it compiled into the kernel?
It does not work to have the fs used on for the root
fs compiled as a
module.

K.D.

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-----Original Message-----
From: Dross Zhou [mailto:zjuzhou@yahoo.com.cn]
Sent: 1. maí 2002 04:35
To: K�ri Dav眇sson
Subject: RE: How to mount romfs in flash as root

filesystem?

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 --- K�ri Dav眇sson [off-list ref] 的正文：> >
-----Original Message-----

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From: Gunnar Larisch [mailto:la@softing.com]
Sent: 30. apr�l 2002 08:41
To: Wolfgang Denk
Cc: Dross Zhou;

linuxppc-embedded@lists.linuxppc.org

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Subject: Re: How to mount romfs in flash as

root

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filesystem?

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On Mon, Apr 29, 2002 at 04:35:24PM +0200,

Wolfgang

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Denk wrote:

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In message

[ref]

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you wrote:

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	Now my kernel has support ROMFS ,i can

mount

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/dev/mtdblock0 /mnt -t romfs and use

chroot

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/mnt as

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root filesystem.But i want to mount

/dev/mtdblock0 as

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root filesystem when system reboot,how

to?I

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have try

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many parameters into kernel such as

"root=/dev/mtdblk0

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romfs ro", but it is no use, it also mount

NFS

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Probably because you mistyoed  the  device

name?  There

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is  an  'o'

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missing, it seems.

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root,how can i mount /dev/mtdblock0

(ROMFS) as

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root

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filesystem?I used linux2.4.4 from denx .

Just pass "root=/dev/mtdblock0", that's all.

This will not work. You must use

"root=/dev/mtdblock/0" and

wrong! Wolfgang is correct just check how the

root

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parameter is parsed
in
init/do_mounts.c function name_to_kdev_t().

If you pass root=/dev/mtdblock/0 it will try to
convert the third "/" to
a number which it can not and the minor number
becomes 0 which is
accedentally correct but is very wrong if you

plan

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to mount
/dev/mtdblock/1
as you root.

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Linux must be
configured with devfs, devfs must be mounted

before and boot support

It can be either way. You can use devfs in which
case you must make it
mountable at boot. You can also get away without
devfs but then you must

suppply all the necessary device nodes in your
filesystem.

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from ramdisk must be disabled.

Don't spread wrong information!

Regards,

K.D.

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Gunnar Larisch
--
Gunnar Larisch
Dipl.-Ing.
Entwicklung
Softing AG - Dep. Industrial Communication
Richard-Reitzner-Allee 6
85540 Haar (near Munich)
Germany
Tel.: ++49 / (0) 89 / 4 56 56 - 183
Fax.: ++49 / (0) 89 / 4 56 56 - 399

	I have try pass root=/dev/mtdblock0 to kernel,
but it always mount NFS as root filesystem.Here is

my

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output message:

Video Network Server v1.1

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MPC850,32M RAM,4M FLASH,USB

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loaded at:     00200000 0020B1F8

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relocated to:  00180000 0018B1F8

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board data at: 001801B8 001801D4

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relocated to:  00200100 0020011C

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zimage at:     00206000 00286ADE

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avail ram:     00287000 02000000

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Linux/PPC load: root=/dev/mtdblock0

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Uncompressing Linux...done.

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Now booting the kernel
Linux version 2.4.4 (root@localhost.localdomain)

(gcc

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version 2.95.2 19991030 (
On node 0 totalpages: 8192

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zone(0): 8192 pages.

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zone(1): 0 pages.

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zone(2): 0 pages.

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Kernel command line: root=/dev/mtdblock0

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Decrementer Frequency: 3000000

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Calibrating delay loop... 47.61 BogoMIPS

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Memory: 30732k available (988k kernel code, 380k

data,

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52k init, 0k highmem)
Dentry-cache hash table entries: 4096 (order: 3,

32768

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bytes)

=== message truncated ===

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