Using Linux 2.6.19 with Xilinx ML405

[Andrei Konovalov]

Hi Peter,

CONFIG_PPC_OCP and ppc_sys_platform_devices related problems are
due to the kernel.org tree stopped using the OCP infrastructure in favor
of ppc_sys stuff (originally created for Freescale 8xx/8xxx SOCs).

What BSP vesion have you selected in the xps?
As far as I can tell, linux_2_6_v1_00_a uses
the approach similar to 2.6 kernel based MontaVista LSP:
"manual" registration of all the devices in arch/ppc/platforms/4xx/virtex.c,
static int __init xilinx_platform_init(void). The only exception
are 16x50 compatible UARTs, that rely on struct ocp_def core_ocp[] etc.

At the moment I am doing some rework of our code (includes rebasing the patches
against a more-or-less recent kernel.org tree). My plan is to drop
both PPC_OCP and ppc_sys, and register all the devices inside xilinx_platform_init().
For Xilinx'es using ppc_sys adds no value but some unneeded complexity.
And it seems ppc_sys is no longer used/supported after Freescale 8xx/8xxx SOCs
moved to arc/powerpc?
Having all the device registration (and references to xparameters.h as well!) in one
place IMHO would make it easier to move Xilinx based boards to arc/powerpc
(someday).

Attached is the patch to get rid of both XILINX_OCP and ppc_sys for
the Xilinx boards. With this patch applied it should be not so difficult
to add the relevant entries to arch/ppc/platforms/4xx/virtex.c by
copying them from the EDK generated linux_2_6_v1_00_a BSP.
The patch is against 2.6.21-rc4 if it matters.


Thanks,
Andrei


Peter Mendham wrote:
> Dear all,
> 
> I am attempting to get a 2.6.19 kernel running on an ML405.  In the 
> spirit of walking before I start to run, I have setup a very simple 
> system with a 10/100 MAC, a UARTlite and the SystemACE controller (other 
> than that, my EDK project has the DDR RAM,  some BRAM, an interrupt 
> controller and the usual gubbins to get a system to work).  I am having 
> some serious issues just getting the thing to compile so I was hoping to 
> pick the brains of this list.  I would appreciate any tips on where I am 
> going wrong.
> 
> First thing I did was to patch the kernel with the BSP from my EDK 
> project (maybe this is my first mistake).  Several files #include 
> config.h - I changed this to autoconf.h.  The ocp_def structure 
> definition was being ignored because CONFIG_PPC_OCP was not defined - I 
> altered some Kconfig files to ensure that when and an ML403 is selected 
> XILINX_OCP is defined, and when that is defined PPC_OCP is also 
> defined.  That solved that problem but left me with a missing definition 
> for ppc_sys_platform_devices which was not present in virtex.c.  I added 
> one but am a bit stuck as to what this should contain.  Another one I 
> have seen lists a UART (which xilinx_ml403.c seems to depend upon).  But 
> this is for a 8250-type UART.  How can I configure this for a UARTlite?  
> Do I need to add an entry for the SystemACE?  I have already added an 
> entry for the EMAC.
> 
> Any hints/experience would be gratefully received.
> 
> TIA,
> -- Peter
> 
> 

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