Hi,

> [... Can't bus_space_mmap(), mmap routine looks correct ...]
>
> here, pmemt and pmema is the tag and physical address of the DSP
> memory space which are get using pci_mapreg_info.

Just to make sure -- do you 1) also call pci_mapreg_map() or 2) call
bus_space_map() before allowing accessing that space by method?

Btw, memory protection value of "1" you're seeing is relevant and means
"allow reads" (PROT_READ that is, see /usr/include/sys/mman.h), which is
correct.

> And below is a part of a test application program to see the DSP memory space.
> ----
> tdsph = open("/dev/tdsp", O_RDWR, 0);
> sram.addr = mmap(0, sram.len, PROT_READ, MAP_SHARED, tdsph,
>             (off_t)sram.offset);

Does mmap() succeed? Is sram.offset really correct (relative to start of
SRAM window)?

>  while(i < sram.len){
>                 addr = (u_int8_t*)sram.addr + i;
>  [...]

Does the DSP SRAM (and the bus hierarchy it's connected to) allow you 8bit
accesses?

> What should I check to see what is wrong? And in addition, is there a
> good simple code that I can study the usage of device mmap function?

Hmm, I couldn't see anything obviously wrong. After checking the
questions above, we can look at more code...

	Regards,
		-- Jachym Holecek