[U-Boot-Users] MPC832x EMDS and PCI expansion board

[Richard Parsons]

On Thursday 28 June 2007 21:20, Randy Vinson wrote:
> Hi Richard,
>
> I've run into the same problem. The information I received was to run
> the PCI bus at 33MHz only. Note that the PCI speed selection in U-Boot
> doesn't seem to do anything. The code is trying to set the divider bits
> in the OCCR register, but the 832x chip doesn't have those bits. To
> change to 33MHz, I had to change SW4-4 (CFG_CLKDVB).
>
> I also experienced problems with the power-on reset. If I used the reset
> button on the 8323 processor board, I got much better results.
>
> I think the problem may be caused by the removal of some pullup
> resistors in the processor card. The schematic I have for the Rev 1.1
> processor board shows the pullups for nXPCI1_DEVSEL, nXPCI1_FRAME,
> nXPCI1_IRDY, nXPCI1_TRDY, nXPCI1_PERR, nXPCI1_SERR, and nXPCI1_STOP
> marked "DNP" which I infer to mean "Do Not Populate." The Rev 1 board
> did not have the DNP marking for those pullups and worked fine for me. I
> don't know what Rev processor card you are using, so this may not be
> related to your problem.
>
> Randy V.

Hi Randy,

Thanks for the hints :-) the hardware  I have is the the Revision 1.0 
Prototype1 production (so the label on the board says so)  

Changing the Clock to 33Mhz didnt seem to do anything for me and still have 
lots of dumb PCI devices listed. Next I think I have to drag out the DSO and 
see what the bus wobbles look like (the reset is concerning to me, so it cant 
hurt to check it)

Could the Lowboot affect the PCI bus? ( but then I have tried low and highboot  
to no avail, so I dont think its that) 

Other than putting uboot in to debug mode to see whats going on with the PCI 
bus. 

TIA,
Richard Parsons 

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