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).
[mailto:firstname.lastname@example.org] בשם Pete Popov
נשלח: Thursday, November 25, 2004 9:23 AM
אל: Gilad Rom
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
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.
> -----הודעה מקורית-----
> מאת: email@example.com
> [mailto:firstname.lastname@example.org] בשם Pete Popov
> נשלח: Wednesday, November 24, 2004 7:58 PM
> אל: Gilad Rom
> עותק: email@example.com
> נושא: Re: Au1500 Chip Select
> Gilad Rom wrote:
>>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
> 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
>>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.