How to mount romfs in flash as root filesystem?

How to mount romfs in flash as root filesystem?

[Dross Zhou]

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Hi ,all
	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
root,how can i mount /dev/mtdblock0 (ROMFS) as root
filesystem?I used linux2.4.4 from denx .
	thanks.

--Zhou Chang




̯¿ªÄãµÄÕÆÐÄ ÈÃÎÒ¿´¿´Äã
http://sweepstakes.yahoo.com/2002cnuser

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

[Wolfgang Denk]

In message <20020429141408.33240.qmail@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.

Wolfgang Denk

--
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd@denx.de
I must follow the people.  Am I not their leader? - Benjamin Disraeli

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

[Jim Thompson]

Which kernel version?

Dross Zhou writes:
>
> MIME-Version: 1.0
> Content-Type: text/plain; charset=gb2312
> Content-Transfer-Encoding: 8bit
>
> Hi ,all
> 	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
> root,how can i mount /dev/mtdblock0 (ROMFS) as root
> filesystem?I used linux2.4.4 from denx .
> 	thanks.
>
> --Zhou Chang
>
>
>
>
> ̯¿ªÄãµÄÕÆÐÄ ÈÃÎÒ¿´¿´Äã
> http://sweepstakes.yahoo.com/2002cnuser
>
>

--
"Life begins when you can spend your spare time programming
instead of watching television."  -- Cal Keegan


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

[Gunnar Larisch]

On Mon, Apr 29, 2002 at 04:35:24PM +0200, Wolfgang Denk wrote:
>
> In message <20020429141408.33240.qmail@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 Linux must be
configured with devfs, devfs must be mounted before and boot support
from ramdisk must be disabled.

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

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

[Kári Davíðsson]

> -----Original Message-----
> From: Gunnar Larisch [mailto:la@softing.com]
> Sent: 30. apríl 2002 08:41
> To: Wolfgang Denk
> Cc: Dross Zhou; linuxppc-embedded@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@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
>


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

[Dross Zhou]

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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@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@flaga.is> µÄÕýÎÄ£º> >
> > -----Original Message-----
> > > > From: Gunnar Larisch [mailto:la@softing.com]
> > > > Sent: 30. apríl 2002 08:41
> > > > To: Wolfgang Denk
> > > > Cc: Dross Zhou;
> > > linuxppc-embedded@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@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@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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RE: How to mount romfs in flash as root filesystem?

[Kári Davíesson]

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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. ma¨ª 2002 11:57
> To: Kári Davíðsson
> 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.
>
> > 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@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@flaga.is> µÄÕýÎÄ£º> >
> > > -----Original Message-----
> > > > > From: Gunnar Larisch [mailto:la@softing.com]
> > > > > Sent: 30. apríl 2002 08:41
> > > > > To: Wolfgang Denk
> > > > > Cc: Dross Zhou;
> > > > linuxppc-embedded@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@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@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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