Re: [LinuxBIOS] Compressing the OLPC VSM?

[yhlu]

1. change crt0.s.lb to include another asm (set stack in ram)
and copy_and_run.asm produced by gcc.
2. you may need to use perl to replace some section name in copy_and_run.asm

look at cache_as_ram.inc and cach_as_ram_post.c to set the stack...

YH

On 5/23/06, Stefan Reinauer  wrote:
> Carl-Daniel Hailfinger  [060523 19:52]:
> > Ronald G Minnich wrote:
> > > Carl-Daniel Hailfinger wrote:
> > > > Hi,
> > > >
> > > > the VSM Ron mailed yesterday to olpc-devel can be compressed
> > > > very well to under 32 kb.
> > > >
> > > > 65536 vsa_test.64k-0001.bin
> > > > 35587 vsa_test.64k-0001.bin.nrv2b
> > > > 32143 vsa_test.64k-0001.bin.lzma
> > > >
> > > > Is the VSM executed after RAM is there and can we use compression
> > > > for it? 50% savings are really good.
> > >
> > > yes, this is great. I want to move to the new compression asap.
> >
> > See my other patch to the list which adds the decompression code
> > and infrastructure. I'm preparing another patch which will make
> > use of all that code. The patches I sent until now do not modify
> > any existing code, so they should be safe to apply.
>
> Can you try and see whether we can exchange the assembler nrv2b code
> in crt0.S.lb with something gcc compiled? This would make the whole
> compression thing nicely pluggable..
>
> Stefan