Re: PNP parallel&serial ports: module reload fails (2.6.11)?

Bjorn Helgaas
2005-06-10T16:27:05Z

On Friday 10 June 2005 10:20 am, Dmitry Torokhov wrote:
> On 6/10/05, Bjorn Helgaas <bjorn.helgaas@hp.com> wrote:
> > On Thursday 09 June 2005 3:16 pm, Russell King wrote:
> > > The reason that 8250 first detects your ports is that they're found
> > > via the legacy method which is independent of PnP. As you correctly
> > > sumise, when you unload 8250_pnp, it disables the device so when you
> > > re-load 8250, it's unable to detect your ports using the legacy method.
> > >
> > > But the legacy method needs to continue to exist for systems which
> > > don't have PnP enabled.
> >
> > But shouldn't we someday move the legacy probing from 8250
> > into an 8250_platform and only do it if we don't have 8250_pnp?
>
> Given how much pain PNP/ACPI probing of i8042 was causing to everyone
> I'd be cautious. BIOS writers are extremely creative. Maybe ia64 only
> while x86 should default to legacy probing.

Yeah, probably so :-(

(ia64 already has no legacy 8250 probing.)