Very Computer

by **Kevi** » Wed, 27 Jun 2001 05:10:26

I've read the Bootdisk-HOWTO, but it doesn't address one issue which
comes into play with bootable CD-ROMs. That is, how to determine the
boot device? With a floppy one can assume it is /dev/fd0, but the first
CD-ROM drive is commonly /dev/hdb or /dev/hdc, and could be something
else.

Is there a way to automatically determine what device the system was
booted from and somehow pass this to the kernel?

by **Gernot Fi** » Wed, 27 Jun 2001 13:26:19

Quote:> I've read the Bootdisk-HOWTO, but it doesn't address one issue which
> comes into play with bootable CD-ROMs. That is, how to determine the
> boot device? With a floppy one can assume it is /dev/fd0, but the first
> CD-ROM drive is commonly /dev/hdb or /dev/hdc, and could be something
> else.

> Is there a way to automatically determine what device the system was
> booted from and somehow pass this to the kernel?

boot to a initrd.
From within you can use a script or a programm to find the cd and
continue the booting.

Look to innominate.de for a rescue cd.

--
MFG Gernot

by **Bart Lagerwe** » Thu, 05 Jul 2001 18:08:49

>> I've read the Bootdisk-HOWTO, but it doesn't address one issue which
>> comes into play with bootable CD-ROMs. That is, how to determine the
>> boot device? With a floppy one can assume it is /dev/fd0, but the
>> first CD-ROM drive is commonly /dev/hdb or /dev/hdc, and could be
>> something else.

>> Is there a way to automatically determine what device the system was
>> booted from and somehow pass this to the kernel?

>boot to a initrd.
>From within you can use a script or a programm to find the cd and
>continue the booting.

>Look to innominate.de for a rescue cd.

Can't find it on http://www.innominate.de, got an exact link?

--
Bart Lagerweij - http://www.nu2.nu

by **Robert Davie** » Thu, 05 Jul 2001 20:45:08

>>> I've read the Bootdisk-HOWTO, but it doesn't address one issue which
>>> comes into play with bootable CD-ROMs. That is, how to determine the
>>> boot device? With a floppy one can assume it is /dev/fd0, but the
>>> first CD-ROM drive is commonly /dev/hdb or /dev/hdc, and could be
>>> something else.

>>> Is there a way to automatically determine what device the system was
>>> booted from and somehow pass this to the kernel?
>>boot to a initrd.
>>From within you can use a script or a programm to find the cd and
>>continue the booting.

Why does it need to know the boot device?

I thought the trick used was an initrd, which copies a '/' into RAM and
uses it as a RAM disk. That way only the boot code accesses the CD on
boot, and then it can be searched for to mount it later, in /proc. The IDE
driver is kind enough to say which devices are CD-ROMs.

Rob

by **Gernot Fi** » Thu, 05 Jul 2001 22:21:07

>>boot to a initrd.
>>From within you can use a script or a programm to find the cd and
>>continue the booting.

>>Look to innominate.de for a rescue cd.

> Can't find it on http://www.innominate.de, got an exact link?

on the page http://www.innominate.de/enterprise/products/rescuecd/index.html

is a link to http://innominate.org/~gpa/rescueCD/

There you can download the image (20 MB)

--
MFG Gernot

Very Computer

Making a bootable CD

Making a bootable CD

Making a bootable CD

Making a bootable CD

Making a bootable CD

Making a bootable CD