Re: [ECOS] How to access PCI memory(HELP)....

["Ling Su" <lingsu at palmmicro dot com>]

>
> I still have question on why 4372 will occupies the first 256Mb of the PCI
> space, where we initialize this setting, can we decrease the space size.
> Currently I change to following configuration,
>
> <1>. HAL_PCI_PHYSICAL_MEMORY_BASE to 0x4000_0000
> <2>. HAL_PCI_ALLOC_BASE_MEMORY to 0x8000_0000
> <3>. NUMB_PG to 8
>
> I can observe signal from PCI bus by using Logic Analyzer, of course, I
> wonder if this will conflict with 4372 address space. But anyway right now
I
> can see signals on PCI pci bus, I haven't fully verify this. I doubt it
will
> have some conflict with serial port debugging if 4372 also mapps to this
> space.
>

Hi, Dear Nick and Jifl,

After carefully examine our FPGA PCI bus design and monitor the signal on
PCI bus, I found both south bridge(4372) and our PCI board drive the PCI
bus. I am thinking of change the address base of 4372. I found the 256MB
address is occupied by I/O memory space configured by N2IOADD, which is set
to 0x8000_0000 originally. I changed it to 0x9000_0000, and keep following,

 <1>. HAL_PCI_PHYSICAL_MEMORY_BASE to 0x4000_0000
 <2>. HAL_PCI_ALLOC_BASE_MEMORY to 0x8000_0000
 <3>. NUMB_PG to 16
 <4>. N2IOADD to 0x9000_0000

Unfortuately the PCI still have multiple target when I access 0x8000_xxxx
address. There is no segment fault as before, but I can not actually access
my board due to some timing problem.

Do you have any idea on why the Segment Falut occurs if I move the PCI
address space to ox9000_0000(physical address, CPU address 0xD000_0000), I
have no clue.

I have a tiny request, hope you can help me out, can you give me the memory
map for eCos in vrc4373 case, I am not sure if this is secrect, but I do
have trouble to figure it out completely although I am use the source now.
:-) More specifically, I'd like to know a following table,

Resource             Physical Address            Virtual Address
--------------------------------------------------------------------
Base Memory                 X                                   X
SIMM/DIMM                 X                                   X
PCI-I/O Space                X                                   X
PCI Mem Space              X                                   X  (*)
VRC 4373                       X                                   X  (*)
VRC 4372                       X                                   X  (*)
Z8530 UART                  X                                   X  (*)
Z8536 Timer                   X                                   X
8255 Parallel                  X                                   X
7-segment Display          X                                   X   (*)
---------------------------------------------------------------------

(*) are more important, if you don't have time, just let me know them will
be fine. Thanks a lot for you time and I appreciate any assiatance you can
offer.

Ling is poor, always meet some trouble out of prediction, please help him.
:-)

Best Regards,
-Ling