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@xxxxxxxxxxxxxx [mailto:linux-mips-bounce@xxxxxxxxxxxxxx] בשם Pete Popov נשלח: Thursday, November 25, 2004 9:23 AM אל: Gilad Rom עותק: linux-mips@xxxxxxxxxxxxxx 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@xxxxxxxxxxxxxx [mailto:linux-mips-bounce@xxxxxxxxxxxxxx] בשם Pete Popov נשלח: Wednesday, November 24, 2004 7:58 PM אל: Gilad Rom עותק: linux-mips@xxxxxxxxxxxxxx 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
