On Tue, 20 May 2014, Johannes Berg wrote:
> On Tue, 2014-05-20 at 03:49 -0400, Robert P. J. Day wrote:
> > quite possibly a silly question (which has never stopped me before),
> > but in perusing the PCIE code in the kernel source, i was looking for
> > sample code to demo in a classroom setting and picked on
> > drivers/net/wireless/iwlwifi/pcie, which i was *assuming* was
> > PCIE-dependent -- specifically, i was going to demo the Advanced-N
> > 6235 PCIE wifi card on an intel galileo board.
> >
> > but i thought it was a bit strange that the pcie/ subdirectory there
> > doesn't seem to depend on PCIEPORTBUS. as a test, i deselected
> > PCIEPORTBUS in a configuration and did a rebuild, and the source in
> > the pcie/ directory was recompiled.
> >
> > am i misunderstanding the function of the kernel config variable
> > PCIEPORTBUS? i notice that .../iwlwifi/Makefile includes the line:
> >
> > iwlwifi-objs += pcie/drv.o pcie/rx.o pcie/tx.o pcie/trans.o
> >
> > which simply compiles those files with no regard to dependency. can
> > someone clarify this? thanks.
>
> The whole driver depends on CONFIG_PCI, maybe it should depend on
> something more PCIe specific, but that wasn't easy to sort out, and
> the APIs it needs aren't PCIe specific afaict.
ok, i'll have to think about that for a few minutes. am i at least
correct in my understanding that, technically, the kernel config
option PCIEPORTBUS is supposed to control whether one wants basic PCIE
support or not?
rday
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Robert P. J. Day Ottawa, Ontario, CANADA
http://crashcourse.ca
Twitter: http://twitter.com/rpjday
LinkedIn: http://ca.linkedin.com/in/rpjday
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