linux-kernel - Re: [PATCH] arm: footbridge_defconfig: disable IDE subsystem

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Message-ID: <20150814174330.GY7557@n2100.arm.linux.org.uk>
Date:	Fri, 14 Aug 2015 18:43:30 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
	Olof Johansson <olof@...om.net>
Subject: Re: [PATCH] arm: footbridge_defconfig: disable IDE subsystem

On Fri, Aug 14, 2015 at 07:04:23PM +0200, Bartlomiej Zolnierkiewicz wrote:
> This patch disables deprecated IDE subsystem in footbridge_defconfig
> (no IDE host drivers are selected in this config so there is no valid
> reason to enable IDE subsystem itself).

That's actually incorrect.  I use IDE on Footbridge because it works
loads with my CY82C693 board.  I never submitted the patches which make
CY82C693 work on ARM though...

However, the CY82C693 must not be allowed to use DMA (which is why the
ATA driver can't be used) - if it does, it locks the PCI bus.  It's
a hardware incompatibility between some PCI devices and the Footbridge.

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