Cortex-m3 Kernel Port.

Cortex-m3 Kernel Port.

[Sasa Sasa]

Hi Catalin/others,

What is the status of the cortex-m3 kernel port ? Is it merged to mailine ?
I cannot find the sources anymore on the links provided at
http://www.linux-arm.org/LinuxKernel/LinuxM3
(has it moved somewhere else....where ?)

Let me know.

Thanks
Sasa

Cortex-m3 Kernel Port.

[Catalin Marinas]

On Mon, 2010-01-25 at 06:15 +0000, Sasa Sasa wrote:
> What is the status of the cortex-m3 kernel port ? Is it merged to
> mailine ?

No and I wasn't planning to unless there are more people using it to be
worth the maintenance effort (the Cortex-M3 platforms I've seen have too
little RAM to be able to run Linux).

> I cannot find the sources anymore on the links provided at
> http://www.linux-arm.org/LinuxKernel/LinuxM3
> (has it moved somewhere else....where ?)

The page is a bit out of date and needs the links updated. I included
the Cortex-M3 in the ARM Ltd's stable Linux kernel release, currently
based on 2.6.28:

http://www.linux-arm.org/git?p=linux-2.6-stable.git;a=summary

The shortlog link shows 6 Cortex-M3 related patches, though two of them
are specific to ARM Ltd's MPS board.

I plan to update these patches and the stable Linux kernel above to
2.6.33 in March.

-- 
Catalin

Cortex-m3 Kernel Port.

[Jamie Lokier]

Catalin Marinas wrote:
> On Mon, 2010-01-25 at 06:15 +0000, Sasa Sasa wrote:
> > What is the status of the cortex-m3 kernel port ? Is it merged to
> > mailine ?
> 
> No and I wasn't planning to unless there are more people using it to be
> worth the maintenance effort (the Cortex-M3 platforms I've seen have too
> little RAM to be able to run Linux).

How much do they have?  People are running uClinux in 8-16MB; it's
tight squeeze but sometimes worth it.  If it has an MMU it would need
a bit less memory.

-- Jamie

Cortex-m3 Kernel Port.

[Catalin Marinas]

On Mon, 2010-01-25 at 11:20 +0000, Jamie Lokier wrote:
> Catalin Marinas wrote:
> > On Mon, 2010-01-25 at 06:15 +0000, Sasa Sasa wrote:
> > > What is the status of the cortex-m3 kernel port ? Is it merged to
> > > mailine ?
> >
> > No and I wasn't planning to unless there are more people using it to be
> > worth the maintenance effort (the Cortex-M3 platforms I've seen have too
> > little RAM to be able to run Linux).
> 
> How much do they have?  People are running uClinux in 8-16MB; it's
> tight squeeze but sometimes worth it.  If it has an MMU it would need
> a bit less memory.

Cortex-M3 doesn't have an MMU. I managed to run it in 2MB but not many
commands were successful. I think from 4MB onwards it should be
acceptable.

-- 
Catalin