[U-Boot-Users] Re: ramdisk image question

[Wolfgang Denk]

In message <20040920.114155.1935.913439 at webmail13.lax.untd.com> you wrote:
> 
> I am using U-Boot - but do I need somehow create ramdisk image first
> (please note that I am building kernel in cygwin Windows XP environment)
> ?

Please don't cross-post extensively. One list is enough.

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Date:    Mon, 20 Sep 2004 22:22:28 +0200
From:    Wolfgang Denk <wd at denx.de>
To:      "Alexander Povolotsky" <pevnev at juno.com>
Subject: Re: ramdisk image question 

In message <20040920.125921.3601.956791 at webmail03.lax.untd.com> you wrote:
> 
> I am using U-Boot - but do I need somehow create ramdisk image first

The build order is completely arbitrary.  You  can  first  build  the
Linux kernel, and then the ramdisk image, or vice versa - as you like
it. Both images are completeley independent of each other.

> (please note that I am building kernel in cygwin Windows XP environment)
> ?

This does not matter.

> Firstly I tried to use root file system using NFS server on the same Windows 
XP 
> machine where I am building via cygwin - by copying pre-made root file system
 
> from Arabella CD-ROM to my windows disk drive - this did not work because har
d 
> links were not preserved during copying ...

Then your method of copying was wrong. I hope youa re aware that  you
cannot  easily  use  a  windows system as NFS server for a Linux root
filesystem? Linux uses a lot of things (concepts  like  device  files
owner,   file  and  directory  permissions,  etc.)  which  cannot  be
represented in a windoze filesystem.

Use a Linux NFS server instead. [You may also want  to  use  a  Linux
build host - it is _much_ faster.]

> Warning: unable to open an initial console.
> Kernel panic: No init found.  Try passing init= option to kernel.
>  <0>Rebooting in 180 seconds..

This means that your root filesystem was incomplete or bad.

> Then I tried to use to NFS mount (read only) onto the Arabella CD-ROM itself 
> (within my Windows XP): 
> 
> bootargs=root /dev/nfs ro nfsroot=192.168.1.100:/E/fadsroot

You cannot use a windows filesystem as NFS root.

> NET: Registered protocol family 1
> NET: Registered protocol family 17
> Sending DHCP requests ...... timed out!
> Sending DHCP requests ...... timed out!
> ...
> 
> So what is the real solution ?

In  this  case  it  seems  you   configured   the   kernel   for   IP
autoconfiguration, but missed to set up a DHCP server.


Ummm... I have two recommendations for you:

1) Forget about using  a  windoze  system  as  development  host  for
   embedded Linux. It is just wasted effort.

2) Have a look at the DULG at http://www.denx.de/twiki/bin/view/DULG/Manual
   It describes in detail how to set up  the  build  and  development
   environment,  and  how  to  configure, install, and use U-Boot and
   Linux.


Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd at denx.de
Real Programmers always confuse Christmas and Halloween because
OCT 31 == DEC 25 !  - Andrew Rutherford (andrewr at ucs.adelaide.edu.au)

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