JFFS2 istead of ROMFS

Hi Dmitry,

> Please explain to me what is exactly JFFS2 ?

Journaling Flash File System II. Here's a very good starting point:

http://www.enseirb.fr/~kadionik/embedded/u.../howto_mtd.html (http://www.enseirb.fr/~kadionik/embedded/uclinux/mtd/howto_mtd.html)

> Where can I get it ?

It's already in the Microtronix distribution.

> How can I compile that filesystem to use on uClinux ?

Enable JFFS2 when configuring the kernel. You'll need an appropriate mtd

mapping driver and chip driver. If you're using CFI flash, you can use the

one (or both) of the CFI chip drivers already in the source tree.

> And how can I use it instead of the romfs which can be built using the

> Linux Filesystem Project from NIOS II IDE ?

This is a bit more involved & it's much easier if you have a linux development

platform (e.g. RH9). Basically, you create a directory tree on your development

system that contains all of the inodes (regular, special, etc) that you want

for your Nios system, then use the mkfs.jffs2 utility to create a binary image

that you program into your flash.

BTW: If you're using the AMDLV065D, you'll probably have to deal with the

"erase" bug in the CFI chip driver ... I haven't had time to look at the

code yet ... so I got lazy & just used cramfs instead ;-)

Regards,

--Scott