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?
(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
>
>
>
>
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