Initial ramdisk support does not work (for me) on 2.6.17.13

Initial ramdisk support does not work (for me) on 2.6.17.13

[Heiko Gerstung]

Hi!

We are building embedded devices based on Linux and we use a ramdisk as
our root device in order to avoid problems with people switching off the
unit without a proper shutdown and to save write-cycles on our flash disc.

Using a 2.6.12 kernel it was no problem to boot the system by using this
kernel parameters:
load_ramdisk=1 console=tty0 initrd=initrd.gz rw  vga=769
ramdisk_size=32768 root=/dev/ram0

Today I tried to test run a 2.6.17.12 kernel using the same parameters
but I get this error message:
VFS: Cannot open root device "ram0" or unknown-block(1,0)
Please append a correct "root=" boot option

The RAMDISK driver seems to be initialized correctly and the initrd
image (gzipped ext2fs) contains a block device /dev/ram0 with major 1
and minor 0 ...

Any hints what has changed and how I can get this kernel to use a
ramdisk as its root device?

Thanks in advance,
best regards,
Heiko


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Re: Initial ramdisk support does not work (for me) on 2.6.17.13

[Oleg Verych]

In gmane.linux.kernel, you wrote:
> Hi!

Hallo.

> We are building embedded devices based on Linux and we use a ramdisk as
> our root device in order to avoid problems with people switching off the
> unit without a proper shutdown and to save write-cycles on our flash disc.
>
> Using a 2.6.12 kernel it was no problem to boot the system by using this
> kernel parameters:
> load_ramdisk=1 console=tty0 initrd=initrd.gz rw  vga=769
> ramdisk_size=32768 root=/dev/ram0
>
> Today I tried to test run a 2.6.17.12 kernel using the same parameters
> but I get this error message:
> VFS: Cannot open root device "ram0" or unknown-block(1,0)
> Please append a correct "root=" boot option

In subject you've wrote "2.6.17.13", but anyway in such cases one must
include full dmesg (boot output) and (sometimes) ".config".

Also, if you are using some kind of embedded hardware, f.e. ARM,
please, use arm-user mailing list for such questions.
____

Re: Initial ramdisk support does not work (for me) on 2.6.17.13

[linux-os (Dick Johnson)]

> Hi!
>
> Hallo.
>
> We are building embedded devices based on Linux and we use a ramdisk as
> our root device in order to avoid problems with people switching off the
> unit without a proper shutdown and to save write-cycles on our flash disc.
>
> Using a 2.6.12 kernel it was no problem to boot the system by using this
> kernel parameters:
> load_ramdisk=1 console=tty0 initrd=initrd.gz rw  vga=769
> ramdisk_size=32768 root=/dev/ram0
>
> Today I tried to test run a 2.6.17.12 kernel using the same parameters
> but I get this error message:
> VFS: Cannot open root device "ram0" or unknown-block(1,0)
> Please append a correct "root=" boot option
>
This is the message you get if you accidentally build the kernel without
ramdisk support. Check your configuration.

Cheers,
Dick Johnson
Penguin : Linux version 2.6.16.24 on an i686 machine (5592.72 BogoMips).
New book: http://www.AbominableFirebug.com/
_
\x1a\x04

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