Re: Linux 2.6 port for M8260 PPC

Hi there

Ya I found that the code related to the MDIO implementation (CONFIG_MDIO)
hasn't been completely ported yet for the 2.6 kernel. Therefore, disabling
the option CONFIG_MDIO in menuconfig should solve the problem.

In case you wish to retain the option, you can copy the appropriate header
files from the 2.4 kernel source into the 2.6 tree. I think the relevant
file is kernel/context.c. Also, in another file, they're referring to a
structure tq_struct, which is defined in linux/tqueue.h. You can copy this
file to your 2.6 source tree as well.

However, this is not recommended, since we're mixing code from two separate
kernels. The tqueue.h header file is related to task queues, which have been
replaced in 2.6 with work queues. It's just that the file calling tq_struct
hasn't been ported yet, apparently. Therefore, it's best to omit the
erroneous code by not selecting the appropriate option in menuconfig. In
this case, all you need to do is disable CONFIG_MDIO.

Regards

Vijay Padiyar

http://www.vijaypadiyar.eu.tf
----- Original Message ----- 
From: "Ramsay, Jim" <redacted>
To: <redacted>
Sent: Monday, March 07, 2005 7:56 PM
Subject: Linux 2.6 port for M8260 PPC

Hi,

I found this using google, going through EXACTLY the same problems trying

to

port some 2.4 code we have to 2.6.

Did you find out how to get around these problems?

Thanks,

Jim



Hi all I wish to discuss some strange issues that I faced with respect to
the Linux 2.6.8 kernel (downloaded from kernel.org). Firstly, I wish to

know

whether this has been known to work on an MPC8260 PowerPC target.

Secondly,

when I tried to compile the Linux kernel with my toolchain (built with Dan
Kegel's crosstool for the PowerPC 603e core, which is what my processor
has), I got some errors which I found to rather queer after investigation.
Firstly, let me state the errors that I 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

`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

`schedule_task' ------------------------------------------------------ On
further investigation, I find that 'schedule_task()' is simply not defined
anywhere in the 2.6.8 kernel sources. This is quite wierd! However, it is
defined in a file 'context.c' (linux-src/kernel) in the 2.4.27 kernel
sources, which we were using earlier. How is it that a function is being
called but its definition has been removed from the sources? Another such
example is with the structure 'tq_struct'. It is referred to in the file
'fcc_enet.c' (linux-src/arch/ppc/8260_io) but it's not defined anywhere!
Again, after checking in the 2.4.27 sources, I find that it's defined 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 folder in the 2.6.8 source (linux-src/arch/ppc/8260_io).
There is one 'uart.c' in the folder '8xx_io', but it doesn't get compiled
during the kernel build process. Will my UART work correctly with this
build? Can someone please tell me if there's some explanation for this

that

I'm unaware of? Which would be the proper forum to report this? Again I
would like to ask: Has the 2.6.8 kernel been tested successfully on the
MPC8260 PowerPC platform? Regards Vijay Padiyar