[microblaze-uclinux] Writing Drivers

[John McGrath <john.mcgrath@xxxxxxxxxx>]

Hi Guys,
Does anyone here have experience with writing their own drivers for 
uClinux. I have a peripheral on the OPB, and it is essentially a memory 
interface - i.e. register style based. with no OS I can control it 
directly by addressing the memory locations in the following way

int main()
{
   volatile int *my_device = BASE_ADDRESS;
     my_device[0] = some_data;

   .....
}

And this will work quite nicely.

However I'm sure this hackery will not work in uClinux. So how does 
someone write a driver in a "standard way". I guess uClinux does things 
like re-mapping the physical address, etc, for its own reasons, and the 
driver would have to support this?
I guess put more simply - if you wanted to write a driver for a bram 
block, how would you do it?

Once the basic driver interface is there, I can think about building the 
more user-friendy functions around it.

Also, I would like to add interrupts, and a handler for it in the 
driver. Its not necessary, but definalty a nice to have...is this 
difficult?

Any info you could offer would be great!

Btw - on a completly unrealted note - I got uclinux running under 7.1i - 
with MB version 4.00a. I had the FPU enabled, but I guess the toolchain 
doesnt support it.
I'm curious though, the bogomips went from 32.97  3.00.a) to 32.95 
(4.00a). No chache links though (ddr controler is not supported by the 
MCH block) - would be nice to see the effect of these!

Cheers,
John

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