PowerPC Local Bus

Kumar Gala galak at kernel.crashing.org
Wed Aug 9 01:03:59 EST 2006

On Aug 8, 2006, at 8:50 AM, Fredrik Roubert wrote:

> Hi!
> I'm about to write drivers for some FPGA's that are connected to the
> local bus of a PowerQUICC II Pro processor and use the user- 
> programmable
> machines (UPM's) to transfer data over the bus. What code does already
> exist for Linux to help me with this? In the stock kernels, I can't  
> even
> find a structure definition for the registers of the local bus
> controller, but it seems strange that no-one has written such code
> before me. Will I really have to write everything from scratch, or  
> what
> code is there that I don't know about yet?

The reason you haven't seen any code is due to several reasons.  One,  
FPGA/localbus implementations can be very specific and thus reuse is  
difficult.  Two, some of this code tends to end up it boot loaders to  
setup the UPM (take a look at U-boot for possible UPM config code).

- kumar

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