u-boot and root filesystems

psommerfeld@gmail.com wrote:
> Another question is how small can a functional rootfs be? I am hoping I
> can get it under 20 MB.

I worked on linux project last year, which may give you some
guidelines...  We had a very functional rootfs that fit snuggly into
4MB (with JFFS2).  We kept our app and additional packages (the most
notable large ones were Python and Qt) in a separate partition in flash
- that took up a little over 20MB (also JFFS2, and we got better than
2:1 compression).

Of course, it all depends on what you want...

I'm now again working on a linux project, and I've just the other day
used Busybox to get a minimal rootfs (NOTHING, except init and sh).
It's only 75K.  Of course, the caveat is you need glibc, too, and
that's 2MB.

-bri

Thanks everyone for the answers. Very useful info.

-- Pete

Brian Silverman wrote:
> psommerfeld@gmail.com wrote:
> > Another question is how small can a functional rootfs be? I am hoping I
> > can get it under 20 MB.
>
> I worked on linux project last year, which may give you some
> guidelines...  We had a very functional rootfs that fit snuggly into
> 4MB (with JFFS2).  We kept our app and additional packages (the most
> notable large ones were Python and Qt) in a separate partition in flash
> - that took up a little over 20MB (also JFFS2, and we got better than
> 2:1 compression).
>
> Of course, it all depends on what you want...
>
> I'm now again working on a linux project, and I've just the other day
> used Busybox to get a minimal rootfs (NOTHING, except init and sh).
> It's only 75K.  Of course, the caveat is you need glibc, too, and
> that's 2MB.
> 
> -bri