PCI mmap - How do I access a PCI board address space?
Hugo
hv at uninova.pt
Thu Sep 25 11:58:20 UTC 2003
Hi!
I am using RTEMS for an i386 target architecture.
I am trying to communicate with a PCI board.
I have tryed the board outside RTEMS and it works fine.
I was able to read the base address where the board should be mapped
into memory.
The Board should be mapped into memory at address 0x1400, unfortunately
I am unable to operate the board properly.
I am guessing that I have been unable to access the board space
properly.
Since there is no mmap function in RTEMS could anyone please tell me how
do I access the board address space?
If I could use the memcpy function I would want to do something like:
/* This is very simplified */
unsigned short data[4];
unsigned short status;
...
for( index=0; index<4; index++ ) {
memcpy( 0x1400 + index*2, &(data[index]), 2 );
do {
/* I should sleep a bit here */
memcpy( &status, 0x1400, 2 );
} while ( status & 0x0001 );
}
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