Kernel and rootfs in ONE image?

Kernel and rootfs in ONE image?

[Frank Prepelica]

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Hi all,

 

in normal case you have got a kernel image and a rootfs image. Place

that images into flash memory, set correct bootargs and it should work.

 

But, is it possible to generate one image which includes the linux
kernel 

and a rootfs, place that single image into flash memory and it should
also work?

 

Thanks in advance!

 

Beste regrads

Frank


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Re: Kernel and rootfs in ONE image?

[David H. Lynch Jr.]

    If you are using 2.6 and you use initramfs, then typically you will
get a single image that contains both the kernel,
    and the initial ramdisk. When you load and execute that image
everything will get sorted out "automagically".

   




Frank Prepelica wrote:
> Hi all,
>
>  
>
> in normal case you have got a kernel image and a rootfs image. Place
>
> that images into flash memory, set correct bootargs and it should work.
>
>  
>
> But, is it possible to generate one image which includes the linux
> kernel 
>
> and a rootfs, place that single image into flash memory and it should
> also work?
>
>  
>
> Thanks in advance!
>
>  
>
> Beste regrads
>
> Frank
>
>
>   
> ------------------------------------------------------------------------
>
> _______________________________________________
> Linuxppc-embedded mailing list
> Linuxppc-embedded@ozlabs.org
> https://ozlabs.org/mailman/listinfo/linuxppc-embedded


-- 
Dave Lynch 					  	    DLA Systems
Software Development:  				         Embedded Linux
717.627.3770 	       dhlii@dlasys.net 	  http://www.dlasys.net
fax: 1.253.369.9244 			           Cell: 1.717.587.7774
Over 25 years' experience in platforms, languages, and technologies too numerous to list.

"Any intelligent fool can make things bigger and more complex... It takes a touch of genius - and a lot of courage to move in the opposite direction."
Albert Einstein

RE: Kernel and rootfs in ONE image?

[Stelios Koroneos]

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Yes it is.
There are basically two ways in doing it
One is to create a binary "blob" where each part (kernel and  fs)  is placed
at a certain location and the space between them is padded
These location should match exactly the kernel mtd partition settings in
terms of size.

The other method i have used, uses some "magic bytes" at the end of a jffs2
filesystem to mark it
Then kernel and the fs are joint and a kernel patch is used to find where
the filesystem starts/ends
This is the method used by Openwrt (in the kamikaze version)

Stelios S. Koroneos

Digital OPSiS - Embedded Intelligence
http://www.digital-opsis.com


  -----Original Message-----
  From: linuxppc-embedded-bounces+stelios=stelioscellar.com@ozlabs.org
[mailto:linuxppc-embedded-bounces+stelios=stelioscellar.com@ozlabs.org]On
Behalf Of Frank Prepelica
  Sent: Friday, June 01, 2007 2:15 PM
  To: linuxppc-embedded@ozlabs.org
  Subject: Kernel and rootfs in ONE image?


  Hi all,



  in normal case you have got a kernel image and a rootfs image. Place

  that images into flash memory, set correct bootargs and it should work.



  But, is it possible to generate one image which includes the linux kernel

  and a rootfs, place that single image into flash memory and it should also
work?



  Thanks in advance!



  Beste regrads

  Frank

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