Help: Base address for ISA-Memory over 82371 bridge

QNX Newsgroups (Archives) qdn.public.qnxrtp.os
1

Hi everybody
I’m trying to write a driver for the motor controller card ESC629 from RTD,
which is on the ISA-Bus in my system. I’ve the processor board MSMP5SE_P3SE
from Digital Logic with a PCI/ISA bridge 82371AB/EB PIIX4. Both cards are
based on PC/104.
To access the ESC629 over the bridge i should know the base adress of the
ISA-Memory to map it in the memory of my application.
I used some methods to access the pci-bus like:

pci_attach(0)
pci_attach_device
pci_find_device
pci_read_config32(bus, deviceFunction, 0x18, 1, &bar2)

But in the last line above i don’t know exactly which offset (0x18) i have
to use.

Who can help me and who has experience with this bridge under qnx.
An example would be very useful for me.

Thanks

Urs

2

Hi Urs,

You shouldn’t have to do anything special with the bridge.

As the bios will have mapped the memory and I/O space for the ISA
bridge. The pci-bios program doesn’t do anything to ISA bridge chips.

E.


Urs Zbinden <urs.zbinden@csem.ch> wrote:

Hi everybody
I’m trying to write a driver for the motor controller card ESC629 from RTD,
which is on the ISA-Bus in my system. I’ve the processor board MSMP5SE_P3SE
from Digital Logic with a PCI/ISA bridge 82371AB/EB PIIX4. Both cards are
based on PC/104.
To access the ESC629 over the bridge i should know the base adress of the
ISA-Memory to map it in the memory of my application.
I used some methods to access the pci-bus like:

pci_attach(0)
pci_attach_device
pci_find_device
pci_read_config32(bus, deviceFunction, 0x18, 1, &bar2)

But in the last line above i don’t know exactly which offset (0x18) i have
to use.

Who can help me and who has experience with this bridge under qnx.
An example would be very useful for me.

Thanks

Urs