[uClinux-dev] Minimum RAM for uClinux

David McCullough davidm at snapgear.com
Wed Oct 12 18:33:50 EDT 2005


Jivin M?ns Brorsson lays it down ...
> I've used the HOWTO from the "NIOS uClinux project"
> http://www.enseirb.fr/~kadionik/embedded/uclinux/HOWTO_compile_uClinux_for_NIOS.html
> but i havent done it with my one cpu configuration. So if NIOS cant do XIP
> what should i do then?

It just means you will have a much harder time with only 256K of RAM.
256K is the absolute lower bounds of memory for a uClinux system.
Anything that reduces this just makes it harder and less likely to work,

Cheers,
Davidm


> On 10/12/05, David McCullough <davidm at snapgear.com> wrote:
> >
> >
> > Jivin M?ns Brorsson lays it down ...
> > > I'm using a NIOS board with an APPEX20k. And i get loads of
> > problems(errors)
> > > when i validate the ide support. Dosen't uClinux 2.4 support the ide
> > driver?
> >
> > It does, but you need to get the code support for your platform right
> > first.
> >
> > I don't think NIOS can do XIP but I may be wrong. This could prevent
> > you running in such a small amount of RAM.
> >
> > > Ok the FLASH first!
> >
> > It's usually a lot easier than IDE to get going :-)
> >
> > Cheers,
> > Davidm
> >
> >
> > > > Jivin M?ns Brorsson lays it down ...
> > > > > I have a disk that i'am trying to connect to my board, haven't got
> > the
> > > > ide
> > > > > controller to work yet. Then i have to write a boot strap and get it
> > > > gooing
> > > > > from the FLASH. Do you now wich bootloader i should use and wich
> > > > parameters
> > > > > to change so the kernel will be satisfied with my small RAM
> > > >
> > > > uboot seems to be doing fairly well lately. It may even support your
> > > > platform already.
> > > >
> > > > Adding IDE drivers to your kernel will probably stop your config from
> > > > working.
> > > >
> > > > You didn't say which CPU you are using ?
> > > >
> > > > I would get flash going first then IDE ;-)
> > > >
> > > > Cheers,
> > > > Davidm
> > > >
> > > > > On 10/12/05, David McCullough <davidm at snapgear.com> wrote:
> > > > > >
> > > > > >
> > > > > > Jivin M?ns Brorsson lays it down ...
> > > > > > > I have 1Mb Flash and 256kb RAM
> > > > > >
> > > > > > If you run the kernel from flash, mount the FS from flash (XIP),
> > > > > > configure the kernel without networking, only essential drivers
> > > > > > and only the minimum filesystem (/bin/sh and little more), then
> > you
> > > > > > should be able to get something to boot, but it will be trickier
> > > > > > than a normal bring up :-)
> > > > > >
> > > > > > Cheers,
> > > > > > Davidm
> >
> > --
> > David McCullough, davidm at cyberguard.com.au, Custom Embedded Solutions +
> > Security
> > Ph:+61 734352815 Fx:+61 738913630 http://www.uCdot.org
> > http://www.cyberguard.com
> > _______________________________________________
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> > uClinux-dev at uclinux.org
> > http://mailman.uclinux.org/mailman/listinfo/uclinux-dev
> > This message was resent by uclinux-dev at uclinux.org
> >
> 
> 
> 
> --
> M?ns Brorsson

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-- 
David McCullough, davidm at cyberguard.com.au, Custom Embedded Solutions + Security
Ph:+61 734352815 Fx:+61 738913630 http://www.uCdot.org http://www.cyberguard.com



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