On Tue, Nov 15, 2005 at 01:02:00PM +1100, Paul Mackerras wrote:
> From: Michael Neuling <[email protected]>
>
> This patch provides an arch hook in the PC speaker beeper driver which
> gives the arch code an opportunity to determine whether the machine
> has an i8253 timer or not. If it doesn't we don't want the driver to
> go poking at the i8253's ports; there might be nothing there or there
> might be something else there which would be upset by being poked at.
>
> We want to be able to build ppc64 kernels which work both on machines
> that have an i8253 equivalent (e.g. some pSeries) and on machines that
> don't (e.g. G5 powermacs), which is why we don't just remove it from
> the config.
Wrong way around. The architecture should provide a way to find it, not
to veto it. It should probably use the plattform_device infrastructure.
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