Re: PCI - memory access problems..
Drew Eckhardt (drew@poohsticks.org)
Wed, 02 Aug 1995 01:35:14 -0600
In message <Pine.OSF.3.90.950729201915.7108A-100000@romeo.pf.jcu.cz>, perex@pf.
jcu.cz writes:
>Hi net!
>
> I'm working on the net driver for PCI card (HP J2585A) and I want
>use memory mapped access. Memory mapped access work well with ISA version
>of this net adapter, but I cann't access memory area shared with PCI bus
>(by me is it range 0xfbffe000-0xfbffffff) due to general protection.
> Have anyone experience with this problem?
Yes.
>Have I do something with memory mapping?
Yes. You can either reprogram the PCI config registers to map it someplace
you can see it (< top of physical RAM) or allocate some memory and use
remap_page_range (note that this does not work until after the
memory management facilities have been initialized, which happens after
statically linked device driver initialization).