[CentOS] Re: Centos 4.x and embeded x86 (wrap, pcengines)

Fri Dec 8 09:43:06 UTC 2006
Johnny Hughes <mailing-lists at hughesjr.com>

On Fri, 2006-12-08 at 03:37 -0600, Johnny Hughes wrote:
> On Wed, 2006-12-06 at 17:07 -0800, John R Pierce wrote:
> > David Hrbác wrote:
> > > Oliver Schulze L. napsal(a):
> > >   
> > >> Thats a good point, I should look into the constant write problem.
> > >> I was thinking in an embedded platform for its costs, low space, low
> > >> power consumption
> > >> and disk less operation.
> > >>     
> > >
> > > No, that's pretty good point. :o) Majority of systems running from
> > > CF|XD|etc. are mounting read only the media, keeping logs and other
> > > thins in RAM-disk and sending them to central authority. There's write
> > > attempt limit within CF.
> > >   
> > there's special file systems optimized for flash use, squashfs is 
> > readonly (its compressed at system build time) and jffs2 (aka jiffy) is 
> > a writeable FS designed to minimize block writes to the flash.    
> > Embedded Linux like used by OpenWRT on the WRT54GS and compatible 
> > routers uses both of these.
> > 
> > http://squashfs.sourceforge.net/
> > http://sourceware.org/jffs2/
> > 
> > the discussion of these two on the OpenWRT WIKI...
> > http://wiki.openwrt.org/OpenWrtDocs/Installing#head-3d6480403b294d4c261f360ab9efc82f388a8790
> > 
> 
> The CentOS Live CD uses squashfs and unionfs, writes to ramdisk, and
> writes to one location.
> 
> It (or something based on it) might be good for an embedded solution.
> 
> This site has newer versions of the technique used:
> 
> http://linux.web.psi.ch/livecd/build.html
> 
> The CentOS kernel used (with built in squashfs support) is here:
> 
> http://mirror.centos.org/centos/4/build/livecd/RPMS/
> 

Even better than the CentOS kernel is the SRPMS to build all the
required kernel modules here:

ftp://ftp.psi.ch/psi/livecd/SRPMS

Thanks,
Johnny Hughes
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