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@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 > > > >
