Re: תשובה: תשובה: Au1500 Chip Select

[Pete Popov <ppopov@embeddedalley.com>]

Gilad Rom wrote:
> The device is a simple ALTERA chip, used for testing (for the mean time).
> I need to make sure that I can access it, and simply read data from it.
> Here's my question: Let's say I assign 0x1000 as the address portion (CSBA)
> Of MEM_STADDR1. What address should I mmap after that?
I don't have the spec in front of me. It's whatever 0x1000 in the CS 
translates to as the physical address.
Pete

> (Using mmap only for initial development, Once I realize all I need
> To do I'll write a driver).
>
> Thanks,
> Gilad.
>
> -----הודעה מקורית-----
> מאת: linux-mips-bounce@linux-mips.org
> [mailto:linux-mips-bounce@linux-mips.org] בשם Pete Popov
> נשלח: Thursday, November 25, 2004 9:23 AM
> אל: Gilad Rom
> עותק: linux-mips@linux-mips.org
> נושא: Re: תשובה: Au1500 Chip Select
>
> 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