clarification: images vs upgrade

Clare claregj at
Sun Jul 13 05:24:47 CEST 2008

Hi Arne,
The analogy with Debian would be -
When you first install, kernel files named vmlinuz are put in /boot
and are grabbed by grub
(installed for you usually) to load the kernel..

here the file named uImage is a kernel and is put in section 3 (called
kernel) of the NAND.
and is loaded by the u-boot file which is in section 1 of the NAND.
(one you don't change except
with extreme care.)

The file name rootfs is the whole of the rest of the operating system
(including basic packages)
 and is put in section 5 (rootfs)

Later when you want to add things and use apt-get that is analogous to
the opkg update and
opkg upgrade, where you load in new packages.

hope this helps

On Sat, Jul 12, 2008 at 10:18 PM, arne anka <openmoko at> wrote:
> hi,
> while browsing the device-owners list, my uncertainity regarding the
> images only grew.
> there's uImage and there's root-image. how are the to describe in terms of
> desktop distributions (uImage writes bootloader, root-image copies an
> image to harddisk like knoppix does?)?
> and how does doing opkg update && opkg upgrade differ from flashing those
> images?
> being a longterm debian/sid user i grew accustomed to do aptitude update
> && aptitude dist-upgrade almost every day and compile a new kernel every
> now and then ...
> thanks in advance
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> Openmoko community mailing list
> community at

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