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Message-ID: <d120d50005061009206d3cdb53@mail.gmail.com>
Date: Fri, 10 Jun 2005 11:20:44 -0500
From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Reply-To: dtor_core@ameritech.net
To: Bjorn Helgaas <bjorn.helgaas@hp.com>
Subject: Re: PNP parallel&serial ports: module reload fails (2.6.11)?
Cc: Russell King <rmk+lkml@arm.linux.org.uk>, Michael Tokarev <mjt@tls.msk.ru>,
       Adam Belay <ambx1@neo.rr.com>,
       matthieu castet <castet.matthieu@free.fr>,
       Andrew Morton <akpm@osdl.org>, linux-kernel@vger.kernel.org
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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.

-- 
Dmitry