I am using SHARC 21160M to which PCI BRIDGE(PLX 9656)is connected , and to this PCI-VME
BRIDGE(UNIVERSE 2 TUNDRA)is connected.I need to write a driver for this vme bus.

Now I have accessed the registers for the PCI bridge(PLX 9656) till now. But I couldn't able to
access the PCI-VME bridge(TUNDRA) registers through the PCI configuration space . Can any one
please help me in configuring the PCI bridge to access the VME bridge registers?????

Lot of Thanks in Advance... :-)

          __________           __________
  -----\ | PLX 9656 | -----\  | TUNDRA   |  -----\  
  -----/ |__________| -----/  |__________|  -----/
local       local      PCI       PCI to      VME bus
bus        to PCI      bus       VME bridge  
           bridge

------------------------------------

I am using SHARC 21160M to which PCI BRIDGE(PLX 9656)is connected , and to this PCI-VME
BRIDGE(UNIVERSE 2 TUNDRA)is connected.I need to write a driver for this vme bus.
>
>Now I have accessed the registers for the PCI bridge(PLX 9656) till now. But I couldn't
able to access the PCI-VME bridge(TUNDRA) registers through the PCI configuration space . Can
any one please help me in configuring the PCI bridge to access the VME bridge registers?????
>
>Lot of Thanks in Advance... :-)
>
>          __________           __________
>  -----\ | PLX 9656 | -----\  | TUNDRA   |  -----\  
>  -----/ |__________| -----/  |__________|  -----/
>local       local      PCI       PCI to      VME bus
>bus        to PCI      bus       VME bridge  
>           bridge
>
>------------------------------------

I may be able to help u out if u provide me more details like how r u configuring or trying to
configure tundra . Are u able to read universe's ID? 

Regards,
Yogesh P G
------------------------------------

No i am not able to read the TUNDRA's device ID.
Now i could able to read all the registers of PLX device. Now I am
suppose to access the TUNDRA through the I/O configuration space of
PLX.

I have set the I/O space start address as 0x02800000 and I have set the
DMCFGA  as 0x80003000  and I tried to read the 0x02800000 location to
access the vendor ID. But i could not able to read it. Is there any
other configuration I should make?

PLX device's registers :-

DMCFGA - PCI configuration address register for Direct master to PCI
I/O  configuration
DMLBAI - Local base address register for Direct master to PCI I/O configuration
DMLBAI = 0x02800000

Note: I am not using any RTOs here and just trying to do in assembly.

If you need any other info, let me know. I will send as soon as possible.

Please help me as soon as possible.

Thanx yogesh :-)

On 8/6/08, y...@yahoo.com <y...@yahoo.com> wrote:
> I am using SHARC 21160M to which PCI BRIDGE(PLX 9656)is connected , and to
> this PCI-VME BRIDGE(UNIVERSE 2 TUNDRA)is connected.I need to write a driver
> for this vme bus.
>>
>>Now I have accessed the registers for the PCI bridge(PLX 9656) till now.
>> But I couldn't able to access the PCI-VME bridge(TUNDRA) registers through
>> the PCI configuration space . Can any one please help me in configuring
>> the PCI bridge to access the VME bridge registers?????
>>
>>Lot of Thanks in Advance... :-)
>>
>>          __________           __________
>>  -----\ | PLX 9656 | -----\  | TUNDRA   |  -----\
>>  -----/ |__________| -----/  |__________|  -----/
>>local       local      PCI       PCI to      VME bus
>>bus        to PCI      bus       VME bridge
>>           bridge
>>
>>------------------------------------
> I may be able to help u out if u provide me more details like how r u
> configuring or trying to configure tundra . Are u able to read universe's
> ID?
>
> Regards,
> Yogesh P G
>
>>
>
------------------------------------