All,
I'm trying to write a device driver under ubuntu for a PCI card, and
exchange information with the card.
The hardware engineer has configured the card to support BAR0 for
data to the card, and linux allocates memory at kernel boot and I am
able to write data from the driver to the card.
For data coming from the card to the driver, the hardware engineer
expects the driver to allocate IO memory when the driver loads, and to
provide the physical address of that memory to the card - which the card
will use with its address translation register, to write data directly
into the provided I/O memory.
Using information from LDD3 I've been able to allocate IO memory, but
I can't find any PCI/kernel functions that allow me to tell the kernel
about this memory for the PCI card, and there's no way to tell the card
about this memory, except through writing the physical address back into
the IO memory associated to BAR0.
How do I make this allocated memory available to the card?
--CB
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