Mailing List Archive: Gentoo: Embedded

bootable iso9660 CD without initrd

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karl at hiramoto

Oct 7, 2009, 10:29 AM

Post #1 of 3 (767 views)
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bootable iso9660 CD without initrd

Hi,

I'm trying to prototype & demo a x86 embedded system on a virtual
machine with a RO root file system. I thought of making a bootable CD
to do it. I'm trying to do it without a initrd to keep the footprint to
a minimum, the kernel boots but getting the error of init unable to open
the initial console. I suspect the problem is that iso9660 can not
store /dev/console correctly as a character device.

Does anyone know if this is possible, and if there are examples anywhere
on how to do it?

Thanks.

peter at stuge

Oct 7, 2009, 10:37 AM

Post #2 of 3 (715 views)
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Re: bootable iso9660 CD without initrd [In reply to]

Karl Hiramoto wrote:
> Does anyone know if this is possible, and if there are examples
> anywhere on how to do it?

Not possible I think - you need a root device with a fully functional
filesystem. Maybe you can hack something up with UMSDOS (IIRC) but I
doubt it. If you need a CD, make a minimal initramfs which mounts
your ro filesystem using loopback.

//Peter

karl at hiramoto

Oct 7, 2009, 11:53 AM

Post #3 of 3 (713 views)
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Re: bootable iso9660 CD without initrd [In reply to]

Peter Stuge wrote:
> Karl Hiramoto wrote:
>
>> Does anyone know if this is possible, and if there are examples
>> anywhere on how to do it?
>>
>
> Not possible I think - you need a root device with a fully functional
> filesystem. Maybe you can hack something up with UMSDOS (IIRC) but I
> doubt it. If you need a CD, make a minimal initramfs which mounts
> your ro filesystem using loopback.

Actually with a few more tries i got it to work, got busybox running now.

my iso9660 loop:

ls -la /mnt/tmp/dev/
total 8
drwxr-xr-x 3 root root 2048 2009-10-06 15:47 .
drwxr-xr-x 20 root root 4096 2009-10-07 20:11 ..
crw-rw-rw- 1 root root 5, 1 2009-10-07 20:11 console
lrwxrwxrwx 1 root root 8 2009-10-05 19:43 log -> /tmp/log
drwxr-xr-x 2 root root 2048 2009-10-05 19:43 pts
crw-rw-rw- 1 root root 4, 64 2009-10-07 20:11 ttyS0
crw-rw-rw- 1 root root 4, 65 2009-10-07 20:11 ttyS1

Thanks,

Karl

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