Interest in DOC and YAFFS? --> YAFFS bootloading

[Srinivasan.Ramasubramaniam at nokia.com]

Hi all !

I request your help to clarify a doubt with regard to initrd-filesystem and cramfs. 

If we use cramfs in place initrd-filesystem, will the entire filesystem will be uncompressed and loaded onto the RAM ?  

But in initrd-filesystem, the entire filesystem is uncompressed and loaded. 

Regards
R Srinivasan 
Nokia Internet Communications 
PH: +91 40 3553343 
Mobile: 098480 32996




> -----Original Message-----
> From: ext Marc Singer [mailto:elf at buici.com]
> Sent: 25. September 2002 1:53
> To: Russ Dill
> Cc: Kenneth Johansson; mtd
> Subject: Re: Interest in DOC and YAFFS? --> YAFFS bootloading
> 
> 
> On Tue, Sep 24, 2002 at 11:47:43AM -0700, Russ Dill wrote:
> > 
> > > > cramfs is a read only filesystem not an archive format 
> like zip or tar
> > > > so you do not have to copy the data into another 
> filesystem to use it.
> > > > You use cramfs instead of initrd+filesystem.
> > > 
> > > That isn't really the issue here.  We're talking about 
> using gzip'd
> > > ext2 versus cramfs to do initrd.  The thing is that in my tests,
> > > cramfs images are larger than compressed ext2 images.  Not what I
> > > would expect.
> > 
> > if you are talking about an initrd, then the features of 
> cramfs aren't
> > quite as usefull, as the whole thing will be loaded into 
> ram anyway. On
> > the other side:
> 
> I see.  That is where my understanding comes from.  Now it 
> makes sense.
> 
> > A cramfs will always be exactly as small as it needs to be, 
> no guessing
> > on an image size. cramfs is created by population, not by making an
> > image, formatting it, mounting it loopback, and then copying files.
> 
> Indeed.  It can be inconvenient knowing how big to make the loopback
> file.
> 
> > incedentally, I have a copy of mkcramfs with device table 
> support (as
> > seen in mkfs.jffs2) as well as permission squashing, so 
> that a cramfs
> > image can be made withoutt root (complete with suid root 
> programs, and
> > /dev entries)
> 
> I'd appreciate a copy of your mkcramfs changes.
> 
> Thanks.
> 
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