Clarifications of downloadable file types
jayv at synth.net
Thu Jul 10 21:39:46 CEST 2008
> *.tar.gz - I know what a tarball is, but when the same filename
> exists with both a jffs2 and a tar.gz extension, do they contain the
> same thing? Why? Is the tar used with an emulator? Would I ever need
> it for the real device?
.jffs2 is for burning to the device, .tar.gz is a copy of the same
filesystem in case you want to set up a root-on-sd environment ..
> What is considered the "image"? It seems to me that it is the jffs2,
> not the kernel. However, the kernel files have the word "image", so
> I am either wrong or very confused.
There are three components burned into your FR's NAND .. the u-boot
bootloader, the kernel image, and the filesystem distribution. The
filesystem contains a full-blowing linux setup, the kernel is just
that - a kernel, and u-boot is the first thing your FR runs when it
starts up ..
> Lastly, does each image have a corresponding kernel so flashing to a
> new distribution would always require flashing the kernel as well?
> If not, how can I know when flashing the kernel is also required?
Kernels are released periodically in the current build hosts, but the
rule is if you don't see one released with a new .jffs2/.tar.gz image,
use the latest one before it .. not all releases need a kernel update,
just a new filesystem tweak or two ..
> Is this information on the wiki somewhere and I just missed it?
Do a search for 'dfu utility' on the wiki for more details ..
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