Kernel 2.6.x to MPC8540/Microsys Board

Hello,

I am about to do my first steps to boot a 2.6 Kernel on the
PM854 Board from Microsys (MPC8540) to see how well it works.
I use U-Boot 1.1.2 and the 2.4.26 Kernel from Microsys compiles and
runs fine on the Board as intended.

Now I 've tried the official 2.6.10 Kernel and (cross-)compiled it
within ELDK 3.1 (btw: is there any difference in between ppc_6xx- and 
ppc_82xx- ?) which works fine, too.
I just started with the mpc8540ads platform with early printk and 
otherwise everything disabled (I want a small kernel) and manually
built the vmlinux.UBoot using mkimage. I just want to see if
something comes up to the console (serial port). Well, currently,
it stops at:

    Verifying Checksum ... OK
    Uncompressing Kernel Image ... OK
mpc8540ads_init(): exit
id mach(): done
MMU:enter
MMU:hw init
MMU:mapin
MMU:setio
MMU:exit
setup_arch: enter
setup_arch: bootmem
ocp: exit
mpc8540ads_setup_arch()
arch: exit
openpic: enter
openpic: timer
openpic: external
openpic: spurious
openpic: exit

Okay. I am not really worried about that... at least I got a sign of 
life and debugging output :-)

My questions are now:
Which is the best Kernel source tree to start porting 2.6.x to the pm854 
platform? I would prefer to stuck with the official sources. Is that a 
good idea?

Is it a good idea to just 'copy' the pm854 platform specific files (PCI 
  initialization and some MTD driver options) to the 2.6.10 tree and see
how it works?

As there anybody who has already a working 2.6.10-something for MPC8540 
(well, non mpc8540ads).

Best greets,

Clemens Koller
_______________________________
R&D Imaging Devices
Anagramm GmbH
Rupert-Mayer-Str. 45/1
81379 Muenchen
Germany

http://www.anagramm.de
Phone: +49-89-741518-50
Fax: +49-89-741518-19

[snip]

My questions are now:
 Which is the best Kernel source tree to start porting 2.6.x to the=20
pm854
platform? I would prefer to stuck with the official sources. Is that a
good idea?

I would suggest 2.6.10 if you want an official kernel release.  Is this=20=

board generally available to people?  If so, and you want support for=20
this board in the official kernel, send me your patches for review. =20
I'll then push them up stream.

Be aware there are some infrastrucal changes I'm working on that moves=20=

the 85xx sub-arch support from using OCP to platform_device.  However,=20=

these have minor changes on the board files.

Is it a good idea to just 'copy' the pm854 platform specific files =

(PCI

=A0 initialization and some MTD driver options) to the 2.6.10 tree and=20=

see
 how it works?

I would take a look at how 2.6 is structured for 85xx.  I tried to do a=20=

better job and provide more common code for a board port to leverage. =20=

So for something like PCI, you should hopefully just have to setup your=20=

memory map and IRQ routing.

As there anybody who has already a working 2.6.10-something for =

MPC8540

(well, non mpc8540ads).

I'm not aware of anyone else with another MPC8540 port, I know of other=20=

MPC8560's, and MPC8555/41 ports.

- kumar

Kumar Gala wrote:

I would suggest 2.6.10 if you want an official kernel release.  Is this 
board generally available to people? 

Yes: www.microsys.de miriac Module: PM854 (and some others)

Be aware there are some infrastrucal changes I'm working on that moves 
the 85xx sub-arch support from using OCP to platform_device.  However, 
these have minor changes on the board files.

I've read your last mails in this list... therefore I am asking. :-)
I just don't want to re-invent the wheel twice. In the pm854 specific
things there are also some OCP updates. (Well, I am still reading lots 
of code... newland for me)
I try to contact the developer Josef Wagner at Microsys who was working
on the 2.4.26-sth.

I would take a look at how 2.6 is structured for 85xx.  I tried to do a 
better job and provide more common code for a board port to leverage.  
So for something like PCI, you should hopefully just have to setup your 
memory map and IRQ routing.

I am comparing 2.4.26-sth with 2.6.10 now. The changes are manageable as 
far as I got it. Where can I get the current work from you?!

Greets,

Clemens Koller
_______________________________
R&D Imaging Devices
Anagramm GmbH
Rupert-Mayer-Str. 45/1
81379 Muenchen
Germany

http://www.anagramm.de
Phone: +49-89-741518-50
Fax: +49-89-741518-19

Clemens,

I would to just use 2.6.10 as starting point and get that working.  The=20=

amount of changes to board code is about 100 lines to go from OCP to=20
platform_device.  I should be releasing patches for this upstream today=20=

and will CC the linuxppc-embedded list, so if you really want them you=20=

can get them, but I dont think its worth the pain for you.

- kumar

On Jan 14, 2005, at 9:33 AM, Clemens Koller wrote:

Kumar Gala wrote:

quoted

I would suggest 2.6.10 if you want an official kernel release.=A0 Is=20=

this

quoted

board generally available to people?

 Yes: www.microsys.de miriac Module: PM854 (and some others)

quoted

Be aware there are some infrastrucal changes I'm working on that=20

moves

quoted

the 85xx sub-arch support from using OCP to platform_device.=A0=20

However,

quoted

these have minor changes on the board files.

I've read your last mails in this list... therefore I am asking. :-)
 I just don't want to re-invent the wheel twice. In the pm854 specific
 things there are also some OCP updates. (Well, I am still reading =

lots

of code... newland for me)
 I try to contact the developer Josef Wagner at Microsys who was=20
working
 on the 2.4.26-sth.

quoted

I would take a look at how 2.6 is structured for 85xx.=A0 I tried to=20=

do a

quoted

better job and provide more common code for a board port to=20

leverage.=A0

quoted

So for something like PCI, you should hopefully just have to setup=20=

your

quoted

memory map and IRQ routing.

I am comparing 2.4.26-sth with 2.6.10 now. The changes are manageable=20=

as
far as I got it. Where can I get the current work from you?!

Greets,

Clemens Koller
_______________________________
R&D Imaging Devices
 Anagramm GmbH
 Rupert-Mayer-Str. 45/1
 81379 Muenchen
 Germany

http://www.anagramm.de
Phone: +49-89-741518-50
 Fax: +49-89-741518-19
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