linux-kernel - Re: [PATCH] base: isa: Remove X86

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Message-ID: <56A1341B.3010702@zytor.com>
Date:	Thu, 21 Jan 2016 11:40:11 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	William Breathitt Gray <vilhelm.gray@...il.com>,
	tglx@...utronix.de, mingo@...hat.com
Cc:	gregkh@...uxfoundation.org, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] base: isa: Remove X86_32 dependency

On 01/21/16 07:56, William Breathitt Gray wrote:
> Many motherboards utilize a LPC to ISA bridge in order to decode
> ISA-style port-mapped I/O addresses. This is particularly true for
> embedded motherboards supporting the PC/104 bus (a bus specification
> derived from ISA).
> 
> These motherboards are now commonly running 64-bit x86 processors. The
> X86_32 dependency should be removed from the ISA configuration option in
> order to support these newer motherboards.
> 
> Signed-off-by: William Breathitt Gray <vilhelm.gray@...il.com>

CONFIG_ISA is mainly used to exclude drivers that are for ISA-specific
devices.

However, PC/104 is indeed an actual ISA parallel bus, and as you say
widely used in embedded systems.  However, I would like to see if there
are anything hidden with !CONFIG_ISA which makes sense in PC104 systems.

	-hpa