How to mount romfs in flash as root filesystem?

[Kári Davíesson]

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 at yahoo.com.cn]
> Sent: 2. ma¨ª 2002 11:57
> To: Kári Davíðsson
> Cc: linuxppc-embedded at 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.
>
> > 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.
> >
> > > -----Original Message-----
> > > From: Dross Zhou [mailto:zjuzhou at yahoo.com.cn]
> > > Sent: 1. ma¨ª 2002 04:35
> > > To: Kári Davíðsson
> > > Subject: RE: How to mount romfs in flash as root
> > filesystem?
> > >
> > >
> > >  --- Kári Davíðsson <kd at flaga.is> µÄÕýÎÄ£º> >
> > > -----Original Message-----
> > > > > From: Gunnar Larisch [mailto:la at softing.com]
> > > > > Sent: 30. apríl 2002 08:41
> > > > > To: Wolfgang Denk
> > > > > Cc: Dross Zhou;
> > > > linuxppc-embedded at lists.linuxppc.org
> > > > > Subject: Re: How to mount romfs in flash as
> > root
> > > > filesystem?
> > > > >
> > > > >
> > > > >
> > > > > On Mon, Apr 29, 2002 at 04:35:24PM +0200,
> > Wolfgang
> > > > Denk wrote:
> > > > > >
> > > > > > In message
> > > > >
> > > >
> > >
> >
> <20020429141408.33240.qmail at web15001.mail.bjs.yahoo.com>
> > > > you wrote:
> > > > > > >
> > > > > > > 	Now my kernel has support ROMFS ,i can
> > mount
> > > > > > > /dev/mtdblock0 /mnt -t romfs and use
> > chroot
> > > > /mnt as
> > > > > > > root filesystem.But i want to mount
> > > > /dev/mtdblock0 as
> > > > > > > root filesystem when system reboot,how
> > to?I
> > > > have try
> > > > > > > many parameters into kernel such as
> > > > "root=/dev/mtdblk0
> > > > > > > romfs ro", but it is no use, it also mount
> > NFS
> > > > > >
> > > > > > Probably because you mistyoed  the  device
> > > > name?  There
> > > > > is  an  'o'
> > > > > > missing, it seems.
> > > > > >
> > > > > > > root,how can i mount /dev/mtdblock0
> > (ROMFS) as
> > > > root
> > > > > > > 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
> > > > 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
> > > > to mount
> > > > /dev/mtdblock/1
> > > > as you root.
> > > >
> > > > > 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.
> > > >
> > > > > from ramdisk must be disabled.
> > > >
> > > > Don't spread wrong information!
> > > >
> > > > Regards,
> > > >
> > > > K.D.
> > > >
> > > > >
> > > > > 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
> > > output message:
> > >
> > > Video Network Server v1.1
> >
> > >
> > > MPC850,32M RAM,4M FLASH,USB
> >
> > >
> >
> > >
> > >
> >
> > >
> > >
> >
> > >
> > > loaded at:     00200000 0020B1F8
> >
> > >
> > > relocated to:  00180000 0018B1F8
> >
> > >
> > > board data at: 001801B8 001801D4
> >
> > >
> > > relocated to:  00200100 0020011C
> >
> > >
> > > zimage at:     00206000 00286ADE
> >
> > >
> > > avail ram:     00287000 02000000
> >
> > >
> > >
> >
> > >
> > > Linux/PPC load: root=/dev/mtdblock0
> >
> > >
> > > Uncompressing Linux...done.
> >
> > >
> > > Now booting the kernel
> > > Linux version 2.4.4 (root at localhost.localdomain)
> > (gcc
> > > version 2.95.2 19991030 (
> > > On node 0 totalpages: 8192
> >
> > >
> > > zone(0): 8192 pages.
> >
> > >
> > > zone(1): 0 pages.
> >
> > >
> > > zone(2): 0 pages.
> >
> > >
> > > Kernel command line: root=/dev/mtdblock0
> >
> > >
> > > Decrementer Frequency: 3000000
> >
> > >
> > > Calibrating delay loop... 47.61 BogoMIPS
> >
> > >
> > > Memory: 30732k available (988k kernel code, 380k
> > data,
> > > 52k init, 0k highmem)
> > > Dentry-cache hash table entries: 4096 (order: 3,
> > 32768
> > > bytes)
> >
> === message truncated ===
>
>

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