[U-Boot] Booting with kernel and root fs in JFFS2 flash?

[U-Boot] Booting with kernel and root fs in JFFS2 flash?

[Adam Moskowitz]

Right now I have my board (a custom PPC-based system) booting from a
kernel and a root filesystem, both in raw flash partitions, both created
with mkimage; The root is loaded as a ramdisk (kinda like an initrd); we
don't actually run with the root in flash.

To make better use of the 32MB of flash on the board, we're considering
putting the kernel, the root filesystem, and some state data in a JFFS2
partition on the flash. I thought sure I read somewhere in the docs that
it's possible to boot from files in a JFFS2 (again, loading into a
ramdisk), but now I can't find where it talks about that or even if it's
possible.

Can someome please tell me if this is indeed possible and, if so, where
in the docs it shows how to do this?

Thanks,
Adam

[U-Boot] Booting with kernel and root fs in JFFS2 flash?

[Alexander Stein]

Hello Adam,

Am Donnerstag, 1. Juli 2010, 04:37:31 schrieb Adam Moskowitz:
> To make better use of the 32MB of flash on the board, we're considering
> putting the kernel, the root filesystem, and some state data in a JFFS2
> partition on the flash. I thought sure I read somewhere in the docs that
> it's possible to boot from files in a JFFS2 (again, loading into a
> ramdisk), but now I can't find where it talks about that or even if it's
> possible.
> 
> Can someome please tell me if this is indeed possible and, if so, where
> in the docs it shows how to do this?

It is possible. Just include your uImage into your JFFS2 image and load it 
from u-boot using fsload. Make sure you include the proper commands into u-
boot. But beforehand you have to setup mtdparts so u-boot knows where to 
search for JFFS2 filesystem. The current partition is changed using 'chpart'.

Best regards
Alexander

[U-Boot] Booting with kernel and root fs in JFFS2 flash?

[Adam Moskowitz]

On Thu, Jul 01, 2010 at 08:25:58AM +0200, Alexander Stein wrote:
> It is possible. . . . load it from u-boot using fsload. . . . The
> current partition is changed using 'chpart'.

I can't either of these commands anywhere in the documentation, here:

    http://www.denx.de/wiki/DULG/Manual

Am I looking in the wrong place? If so, where should I be looking
instead?

Thanks,
Adam