mpc8248 and FCC ethernet

mpc8248 and FCC ethernet

[Wojciech Kromer]

What are differences between using FCC in u-boot and kernel?

I have fine working u-boot on my new mpc8248 board,
I can sucessfully download kernel via ethernet on FCC1.

But inside kernel all RX frames are filled with 0xff data,
also send frames I can see on the other side, are full of 0xff.
Clocks and other FCC aware registers seems to be correct.
The same version on linux (2_4_devel from denx.de) works fine
on another mpc8260 board.

Any hints? Where to find differences?
What should be important to check?

RE: mpc8248 and FCC ethernet

[Fillod Stephane]

Wojciech Kromer wrote:
[..]
>But inside kernel all RX frames are filled with 0xff data,
>also send frames I can see on the other side, are full of 0xff.
>Clocks and other FCC aware registers seems to be correct.
>The same version on linux (2_4_devel from denx.de) works fine
>on another mpc8260 board.

Most likely, you're using a wrong DPRAM range.
This reminds me this problem "All-ones problem with FCC1 on MPC8541"
=20
http://ozlabs.org/pipermail/linuxppc-embedded/2004-November/016050.html

so double check your manual. The MPC8555E manual is still wrong in
this regard, and no errata has been issued yet.

--=20
Stephane

Re: mpc8248 and FCC ethernet

[Wojciech Kromer]

>
>so double check your manual. The MPC8555E manual is still wrong in
>this regard, and no errata has been issued yet.
>
>  
>
Uff, it works now.Thank You for quick reply.

Surely MPC8272 familly doc says there are 8K DPRAM from 0 to 0x1fff
It should be updated in include/asm/cpm_8260.h