linux-kernel - Re: [PATCH 04/10] iio: stx104: Change STX104 dependency to ISA

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Date:	Sat, 9 Apr 2016 13:58:14 +0100
From:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:	William Breathitt Gray <vilhelm.gray@...il.com>
Cc:	Guenter Roeck <linux@...ck-us.net>, gregkh@...uxfoundation.org,
	tglx@...utronix.de, jic23@...nel.org, knaack.h@....de,
	lars@...afoo.de, pmeerw@...erw.net, wim@...ana.be,
	linus.walleij@...aro.org, gnurou@...il.com,
	linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
	linux-watchdog@...r.kernel.org, linux-gpio@...r.kernel.org
Subject: Re: [PATCH 04/10] iio: stx104: Change STX104 dependency to ISA_BUS

> I believe this is the source of the issues I encountered on my initial
> attempt to decouple the X86_32 dependency from the ISA option. I suspect
> if I add an explicit X86_32 dependency to the PNPBIOS driver, I will be
> able to remove the X86_32 dependency from the ISA option without
> incident from the other drivers.

That would be correct. PnPBIOS is obsoleted by ACPI so a 64bit x86
platform shouldn't be using PnPBIOS nor anything non x86. Strictly
speaking PnpBIOS is not ISA, it's onboard devices.

ISA devices that can be enumerated are usually enumerated via ISAPnP
which is platform independent.

Quite a few of the ISA drivers if you review them more carefully have
other endian and size assumptions, IRQ assumptions and probably fun bugs
because they've simply never been run on anything else even when it is
possible.

Alan