Linux on a Motorola MPC5200 ?

Linux on a Motorola MPC5200 ?

[Sylvain Munaut]

Hello

I'd like to run linux on a future custom board based on a motorola
MPC5200 and I have a few questions :

 - What is the current support for it ? Stable ... I'd need the DMA (
well, their 'special DMA fancy stuff' ;) ), ATA, DDR, I2S, AC97 mainly.
 - I'd really like to run a 2.6 kernel on it. If it's not yet ported to
the 2.6 what is the current ppc support for 2.6 ? Would I "only" need to
port MPC specifics ?
 - Where can I find the current stuff ? I've taken what is in
ppc.bkbits.net/linux-2.4-mpc5xxx, is there other things I should consider ?

Thanks for any informations

    Munaut Sylvain

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Re: Linux on a Motorola MPC5200 ?

[Dale Farnsworth]

On Tue, Jan 27, 2004 at 05:28:38PM +0000, Sylvain Munaut wrote:
> Hello
>
> I'd like to run linux on a future custom board based on a motorola
> MPC5200 and I have a few questions :
>
> - What is the current support for it ? Stable ... I'd need the DMA (
> well, their 'special DMA fancy stuff' ;) ), ATA, DDR, I2S, AC97 mainly.
> - I'd really like to run a 2.6 kernel on it. If it's not yet ported to
> the 2.6 what is the current ppc support for 2.6 ? Would I "only" need to
> port MPC specifics ?
> - Where can I find the current stuff ? I've taken what is in
> ppc.bkbits.net/linux-2.4-mpc5xxx, is there other things I should consider ?
>
> Thanks for any informations
>
>    Munaut Sylvain

I think you've found pretty much what's available.  I haven't
seen a 2.6 port for the 5200 yet.

-Dale Farnsworth

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Re: Linux on a Motorola MPC5200 ?

[Wolfgang Denk]

In message <40169FC6.1040805@246tNt.com> you wrote:
>
> I'd like to run linux on a future custom board based on a motorola
> MPC5200 and I have a few questions :
>
>  - What is the current support for it ? Stable ... I'd need the DMA (

Yes, it is stable, with a couple of well-known problems.

> well, their 'special DMA fancy stuff' ;) ), ATA, DDR, I2S, AC97 mainly.

ATA: OK as long as you don't enable DMA writes (*)

DDR: OK (use icecube_5200_DDR configuration in U-Boot); the LOWBOOT
     option is not working yet (we are working on this)

I2S: simultaneous reading and writing is impossible (*)
AC97: ditto

(*) to fix these issues we're waiting for a  bugfix  release  of  the
    BestComm CAPI which might become availabe by mid February.

>  - I'd really like to run a 2.6 kernel on it. If it's not yet ported to

Forget it. Why would you want to  do  that?  Which  features  do  you
expect from 2.6 which are not available in 2.4?

> the 2.6 what is the current ppc support for 2.6 ? Would I "only" need to
> port MPC specifics ?

No comment.

>  - Where can I find the current stuff ? I've taken what is in
> ppc.bkbits.net/linux-2.4-mpc5xxx, is there other things I should consider ?

Our current stuff is on our CVS  server,  in  the  linuxppc_2_4_devel
tree.  As  far  as the 5200 is concerned this includes stuff that was
submitted but not yet added to the linux-2.4-mpc5xxx  tree  (but  Tom
promised to add our patches).


Best regards,

Wolfgang Denk

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Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd@denx.de
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Re: Linux on a Motorola MPC5200 ?

[Sylvain Munaut]

Hi

>>well, their 'special DMA fancy stuff' ;) ), ATA, DDR, I2S, AC97 mainly.
>>
>>
>
>ATA: OK as long as you don't enable DMA writes (*)
>
>
>
Are DMA Read supported ? ( I mean possible to just use DMA for the reads
? My application is about 95 % reads ;)
What's the performance impact ?

>DDR: OK (use icecube_5200_DDR configuration in U-Boot); the LOWBOOT
>     option is not working yet (we are working on this)
>
>I2S: simultaneous reading and writing is impossible (*)
>AC97: ditto
>
>
>
Ok, not a problem for me I only do audio out.
But just in case, if I do In and Out on different PSC, does this works ?

>(*) to fix these issues we're waiting for a  bugfix  release  of  the
>    BestComm CAPI which might become availabe by mid February.
>
>
Cool !

>> - I'd really like to run a 2.6 kernel on it. If it's not yet ported to
>>
>>
>
>Forget it. Why would you want to  do  that?  Which  features  do  you
>expect from 2.6 which are not available in 2.4?
>
>
>
>
Well things like *:
 -  Pluggable I/O Scheduler
 -  Kernel preemption
 -  Better IPSec / Encryption support
 -  udev stuff ( in fact userspace but may depend on some kernel
interface, have to check. Primarly done for the 2.6 AFAIK )
 -  Native ALSA

And also because when I start a new project I like to use "new" stuff ;)
That's were a majority of new nifty features are ...



(*) I'm not sure they are all only and 2.6 and not backported/already in
2.4, I have to check.

>Our current stuff is on our CVS  server,  in  the  linuxppc_2_4_devel
>tree.  As  far  as the 5200 is concerned this includes stuff that was
>submitted but not yet added to the linux-2.4-mpc5xxx  tree  (but  Tom
>promised to add our patches).
>
>
>
I've just downloaded it but ran into a problem when compiling the kernel
with the icecube default config.

In arch/ppc/boot/common/misc-simple.c :
 - the decompress_kernel routine is used before being defined/declared
 - the decompress_kernel defined there takes 3 args, the one used in
load_kernel func ( same file ), gives 4 args to it ...


Sylvain Munaut

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MPC5200 LOWBOOT problem

[Tord Andersson]

Wolfgang,

I have seen a remark on problems with the MPC5200 LOWBOOT configuaration in the linuxppc-embedded list:

>DDR: OK (use icecube_5200_DDR configuration in U-Boot); the LOWBOOT
>     option is not working yet (we are working on this)

I have serached the PPC and U-Boot lists but have not been able to find more info.
What effect does the LOWBOOT problem have? Page allocation error during kernel startup or something else?
Any additional information would be very helpful.

Kind regards,

Tord Andersson


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Re: MPC5200 LOWBOOT problem

[Wolfgang Denk]

Dear Tord,

in message <07b501c3e9ca$0f1c89e0$f62d7f3e@emil> you wrote:
>
> >DDR: OK (use icecube_5200_DDR configuration in U-Boot); the LOWBOOT
> >     option is not working yet (we are working on this)
>
> I have serached the PPC and U-Boot lists but have not been able to find more info.

I guess there are not many DDR based MPC5200 boards out  there;  most
people seem to be using the LITE5200, or follow this design closely.

> What effect does the LOWBOOT problem have? Page allocation error during kernel startup or something else?

U-Boot does not boot, i. e. nothing goes.

> Any additional information would be very helpful.

Actually nothing happened yet. We had  some  other,  higher  priority
issues  to solve. I'll check in the fix to the U-Boot tree as soon as
it becomes available.

Best regards,

Wolfgang Denk

--
See us @ Embedded World, Nuremberg, Feb 17 - 19,  Hall 12.0 Booth 440
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd@denx.de
Hindsight is an exact science.

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Does anybody know which function can read clock counter of Linux kernel?

[John Zhou]

Hi!

Does anybody know which function can read clock counter of Linux kernel?
I konw "tickGet()" of vxworks can read OS clock counter.

Thanks any commemts!
John

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