RE: Some issues with kernel 2.6 for MPC8260 target

I ported it to the Embedded Planet ep8260 board with FCC3, ep8248 board
with FCC1 and FCC2 and ep8280 with FCC2 and FCC3.  I had to make very
little, if anything, to get it to work.  I did not try 2.6.9.  I am
currently using 2.6.10-rc3 which I believe after the last merge is now
2.6.10.  I did practically nothing to get all of these to work.=20

-----Original Message-----
From: Saso Kavcic [mailto:saso@activetools.si]=20
Sent: Wednesday, January 12, 2005 9:27 AM
To: Steven Blakeslee
Cc: linuxppc-embedded@ozlabs.org
Subject: Re: Some issues with kernel 2.6 for MPC8260 target
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Hi Steven,
=20
Have you noticed any improvements in 2.6.10. over 2.6.9? We=20
were porting
2.6.9 to a custom mpc8275vr
board and we were able to get everything working except=20
ethernet (fcc enet). We did manage to get a few packets over=20
it but it was all very slow, unstable and unpredictable and=20
it seemed that fcc enet driver doesn't work well in 2.6. Were=20
you able to use fcc under 2.6.9?
=20
Best Regards, Saso
=20
Steven Blakeslee wrote:
=20

quoted

I would suggest going to the latest 2.6.10 kernel.  I have=20

it running=20

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with several ethernets running on all the 82xx processors.

=20

quoted

-----Original Message-----
From: linuxppc-embedded-bounces@ozlabs.org
[mailto:linuxppc-embedded-bounces@ozlabs.org] On Behalf Of Vijay=20
Padiyar
Sent: Wednesday, January 12, 2005 5:37 AM
To: LinuxPPC Support
Subject: Some issues with kernel 2.6 for MPC8260 target

Hi all

I wish to discuss some strange issues that I faced with=20

respect to the=20

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Linux
2.6.8 kernel (downloaded from kernel.org). Firstly, I wish to know=20
whether this has been known to work on an MPC8260 PowerPC target.

Secondly, when I tried to compile the Linux kernel with my=20

toolchain=20

quoted

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(built with Dan Kegel's crosstool for the PowerPC 603e=20

core, which is=20

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what my processor has), I got some errors which I found to rather=20
queer after investigation. Firstly, let me state the errors that I=20
got:

------------------------------------------------------

 LD      init/built-in.o
 LD      .tmp_vmlinux1
arch/ppc/8260_io/built-in.o(.text+0x103c): In function
`mii_queue_relink':
arch/ppc/8260_io/fcc_enet.c:1254: undefined reference to=20
`schedule_task'
arch/ppc/8260_io/built-in.o(.text+0x1074): In function
`mii_queue_config':
arch/ppc/8260_io/fcc_enet.c:1263: undefined reference to=20
`schedule_task'

------------------------------------------------------

On further investigation, I find that 'schedule_task()' is=20

simply not=20

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defined anywhere in the 2.6.8 kernel sources. This is quite wierd!=20
However, it is defined in a file 'context.c'
(linux-src/kernel) in the 2.4.27 kernel sources, which we=20

were using=20

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earlier. How is it that a function is being called but its=20

definition=20

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has been removed from the sources?

Another such example is with the structure 'tq_struct'. It=20

is referred=20

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to in the file 'fcc_enet.c'
(linux-src/arch/ppc/8260_io) but it's not defined anywhere!=20
Again, after checking in the 2.4.27 sources, I find that=20

it's defined=20

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in the file 'tqueue.h' (linux-src/include/linux)!

A third thing is that the 2.4.27 kernel source file 'uart.c'
(linux-src/arch/ppc/cpm2_io) is not present in the corresponding=20
folder in the 2.6.8 source (linux-src/arch/ppc/8260_io).=20

There is one=20

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'uart.c' in the folder '8xx_io', but it doesn't get compiled during=20
the kernel build process. Will my UART work correctly with=20

this build?

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Can someone please tell me if there's some explanation for=20

this that=20

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I'm unaware of? Which would be the proper forum to report=20

this? Again=20

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I would like to ask: Has the 2.6.8 kernel been tested=20

successfully on=20

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the MPC8260 PowerPC platform?

Lastly, where can I get the latest stable Linux kernel=20

source for the=20

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PowerPC platform?

Regards

Vijay Padiyar
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