uclinux on MMU platforms - query

uclinux on MMU platforms - query

[Amol Lad]

Hi,
 Can I run uClinux on platforms that has MMU

--
Amol


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Re: uclinux on MMU platforms - query

[Greg Ungerer]

Hi Amol,

Amol Lad <dal_loma@yahoo.com> writes:
 > Hi,
 >  Can I run uClinux on platforms that has MMU

You could, but why would you want to?

If your processor has VM then wou will be better of
using it. Without VM you suffer more problems from
free memory fragmentation, no dynamically growing
stacks, ne memory protection between kernel and
processes, etc.

There are currently no patches for processors with
VM to run with the CONFIG_NO_MMU support of uClinux.
(There would be a little bit of work to do if you
wanted to).

Regards
Greg



------------------------------------------------------------------------
Greg Ungerer  --  Chief Software Wizard        EMAIL:  gerg@snapgear.com
SnapGear Pty Ltd                               PHONE:    +61 7 3435 2888
825 Stanley St,                                  FAX:    +61 7 3891 3630
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Re: uclinux on MMU platforms - query

[Alan Cox]

On Wed, 2002-08-07 at 06:46, Greg Ungerer wrote:
>  >  Can I run uClinux on platforms that has MMU
> 
> You could, but why would you want to?

Being able to run true ucLinux on i386 makes debugging and verification
of software so much less painful sometimes. 

Re: uclinux on MMU platforms - query

[Greg Ungerer]

Hi Alan,

Alan Cox wrote:
> On Wed, 2002-08-07 at 06:46, Greg Ungerer wrote:
> 
>> >  Can I run uClinux on platforms that has MMU
>>
>>You could, but why would you want to?
> 
> 
> Being able to run true ucLinux on i386 makes debugging and verification
> of software so much less painful sometimes. 

For some things yes. But it is a real pain trying to track
down memory corruption and stack overflow problems in
applications. They have a tendency to take your the whole system...

Regards
Greg



------------------------------------------------------------------------
Greg Ungerer  --  Chief Software Wizard        EMAIL:  gerg@snapgear.com
SnapGear Pty Ltd                               PHONE:    +61 7 3435 2888
825 Stanley St,                                  FAX:    +61 7 3891 3630
Woolloongabba, QLD, 4102, Australia              WEB:   www.snapgear.com

Re: uclinux on MMU platforms - query

[David Weinehall]

On Thu, Aug 08, 2002 at 10:33:40AM +1000, Greg Ungerer wrote:
> Hi Alan,
> 
> Alan Cox wrote:
> >On Wed, 2002-08-07 at 06:46, Greg Ungerer wrote:
> >
> >>>  Can I run uClinux on platforms that has MMU
> >>
> >>You could, but why would you want to?
> >
> >
> >Being able to run true ucLinux on i386 makes debugging and verification
> >of software so much less painful sometimes. 
> 
> For some things yes. But it is a real pain trying to track
> down memory corruption and stack overflow problems in
> applications. They have a tendency to take your the whole system...

Wouldn't an ucLinux-version of uml be a good idea? :-)


Regards: David Weinehall
-- 
 /> David Weinehall <tao@acc.umu.se> /> Northern lights wander      <\
//  Maintainer of the v2.0 kernel   //  Dance across the winter sky //
\>  http://www.acc.umu.se/~tao/    </   Full colour fire           </

Re: uclinux on MMU platforms - query

[gerg]

Hi David,

David Weinehall wrote:
> On Thu, Aug 08, 2002 at 10:33:40AM +1000, Greg Ungerer wrote:
>>Alan Cox wrote:
>>
>>>On Wed, 2002-08-07 at 06:46, Greg Ungerer wrote:
>>>
>>>
>>>>> Can I run uClinux on platforms that has MMU
>>>>
>>>>You could, but why would you want to?
>>>
>>>
>>>Being able to run true ucLinux on i386 makes debugging and verification
>>>of software so much less painful sometimes. 
>>
>>For some things yes. But it is a real pain trying to track
>>down memory corruption and stack overflow problems in
>>applications. They have a tendency to take your the whole system...
> 
> 
> Wouldn't an ucLinux-version of uml be a good idea? :-)

Yeah :-)

We sort of have better than that now. There are quite a few
emulators that run under standard Linux that will quite happliy
run uClinux. There is xcopilot (m68328), coldfire (5206),
ARMulator (ARM), tsim (SPARC leon) and or1ksim (OPENcores OR1000).
I am sure there is more!

Regards
Greg


------------------------------------------------------------------------
Greg Ungerer  --  Chief Software Wizard        EMAIL:  gerg@snapgear.com
Snapgear Pty Ltd                               PHONE:    +61 7 3279 1822
825 Stanley St,                                  FAX:    +61 7 3279 1820
Woolloongabba, QLD, 4102, Australia              WEB:   www.SnapGear.com