Re: writing/finding pci bar0

Tim Roberts wrote:
The low-order bit of the BAR registers say whether the address is in memory
space (0) or I/O port space (1). Parallel ports use I/O ports. That's why
you're able to tickle it from user mode (using outpb, right?). If it was a
memory address, you'd need to use a kernel driver.

If the device uses memory rather than I/O space, you can open /dev/mem
and mmap it.

GH

.

Relevant Pages

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