Re: תשובה: Au1500 Chip Select

[Pete Popov <ppopov@embeddedalley.com>]

Gilad Rom wrote:
> Well, what I did so far was setup mem_stcfg1/mem_staddr1. 
> What I'm having trouble with is, what values do I need to 
> Set in mem_staddr1, 
Depends on the device attached to that CS and the physical address 
you want to assign to it.
> and then, how do I access 
> That memory (mmap? Driver?).
Driver would be better.

Pete

> Thanks.
> Gilad.
>
> -----הודעה מקורית-----
> מאת: linux-mips-bounce@linux-mips.org
> [mailto:linux-mips-bounce@linux-mips.org] בשם Pete Popov
> נשלח: Wednesday, November 24, 2004 7:58 PM
> אל: Gilad Rom
> עותק: linux-mips@linux-mips.org
> נושא: Re: Au1500 Chip Select
>
> Gilad Rom wrote:
>
>
> > Hello,
> >
> > I am trying to implement a simple program which Will be used to 
> > communicate with an I/O peripheral Over CS1 (Chip select 1) of the 
> > au1500.
>
> I'm not sure I understand what you're trying to do. The chip select is setup
> by the boot loader or kernel, and you don't touch it anymore. The CS will
> get asserted/deasserted based on the addresses you're trying to access.
>
>
> > Has anyone ever attempted this? Could someone Point me to some sample 
> > code, perhaps? I am grepping Through the kernel, yet having trouble 
> > locating Chip-select specific code for reference.
>
> Again, what sort of an example are you looking for?  Setting up a chip
> select on the Au1x is nothing more than writing the appropriate values to
> the 3 chip select registers. Then you're done.
>
> Pete