Re: Specify devices manually in exotic environment

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Wed, 23 Aug 2006, Milan Hauth wrote:

> On Wed, 23 Aug 2006 12:10:27 +0200, Denis Vlasenko
> <[email protected]> wrote:
>
>>>> mknod /dev/root b "$ROOTMAJ" "$ROOTMIN"
>>>
>>> This also did not help -- 'cat: /dev/root: No such device or address'.
>>> Major/minor is 4/0, as recommended in the kernel docs for /dev/root.
>>
>> What cat? Where did I say to cat anything? I said "create new node,
>> namely, 'root', in the /dev, with the following major/minor#".
>
> I did create the root node (b4/0). Just used cat for testing, since I
> didn't have dd available yet on the initrd. But obviously it did not
> work.. :-\
>
>
>> If it doesn't work, maybe your initrd is mounted ro.
>> Remount it rw first. Or mount a ramfs somewhere,
>> it will give you writable place to play.
>>
>>> So where can I find my flash memory..? Again, with GRUB I just had to
>>> specify the device address (0x80) and the kernel/initrd positions in
>>> sector syntax, which works fine. Maybe I can do the same in Linux with
>>> my
>>> ext2 partition, to specify the start and end sectors ('Specify drives
>>> manually..'). But where to start?
>>
>> Start by reading boot messages. They ought to say
>> what devices are found.
>
> Ah, excellent: A IDE controller is found:
>
> CS5530: IDE controller at PCI slot 0000:00:12.2
>
> The according line in lspci:
>
> 00:12.2 0101: 1078:0102
>
> And there are also two IDE interfaces:
>
> PCI: Setting latency timer iof devvice 0000:00:12.0 to 64
>      ide0: BM-DMA at 0xfb00-0xfb07, BIOS settings: hda: pio, hdb: pio
>      ide1: BM-DMA at 0xfb08-0xfb0f, BIOS settings: hdc: pio, hdd: pio
> Probing IDE interface ide0...
> Probing IDE interface ide1...
>
> ..but no devices, which is logical: If there would be devices, I could use
> them via /dev/hd*.
>
> But why is the IDE controller being recognized, while no devices are
> found..?
>
>
>> Try hexdump'ing your sd devices:
>>
>> # dd if=/dev/sda bs=1024 count=1 | hexdump
>>
>> and see whether they give something like boot sector.
>
> 'No such device or address'.. I already tried special devices before,
> forgot to mention.
>
>
> Maybe I just gonna try to get some more information about my hardware and
> recheck my Kernel configuration..
>
> Cheers, milahu
> -

A lot of flash devices emulate a IDE hard disk. With an IDE driver
__installed__, the first one should be /dev/hda, the first partition
should be /dev/hda1, etc. You can use the attached MAKEDEV to
see what the major/minor numbers should be, and make a few in
your initial RAM disk to exeriment.



Cheers,
Dick Johnson
Penguin : Linux version 2.6.16.24 on an i686 machine (5592.62 BogoMips).
New book: http://www.AbominableFirebug.com/
_



****************************************************************
The information transmitted in this message is confidential and may be privileged.  Any review, retransmission, dissemination, or other use of this information by persons or entities other than the intended recipient is prohibited.  If you are not the intended recipient, please notify Analogic Corporation immediately - by replying to this message or by sending an email to [email protected] - and destroy all copies of this information, including any attachments, without reading or disclosing them.

Thank you.

Attachment: MAKEDEV
Description: MAKEDEV


[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]
  Powered by Linux