netdev - Re: [PATCH net-next 5/7] net:fec: add support for dumping transmit ring on timeout

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Message-ID: <20140530000336.GM3693@n2100.arm.linux.org.uk>
Date:	Fri, 30 May 2014 01:03:36 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	"fugang.duan@...escale.com" <fugang.duan@...escale.com>
Cc:	David Laight <David.Laight@...LAB.COM>,
	'Frank Li' <lznuaa@...il.com>,
	"Frank.Li@...escale.com" <Frank.Li@...escale.com>,
	"shawn.guo@...aro.org" <shawn.guo@...aro.org>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 5/7] net:fec: add support for dumping transmit
	ring on timeout

On Thu, May 29, 2014 at 08:17:07AM +0000, fugang.duan@...escale.com wrote:
> Hi, Russell,
> 
> I see linux next and net "imx_v6_v7_defconfig" don't enable "CONFIG_CMA",
> if you enable the feature,

Sorry, telling people that CMA is required to avoid that is just not an
acceptable "solution".

With CMA not enabled, the DMA memory provided to the driver is still
perfectly valid and should be no different from what CMA provides.

I'd strongly suggest investigating why there is this difference, and
what the difference is - I'd assume freescale have the ability to do
that with their own devices much more than I have, and probably to a
greater depth too - especially as there is no possibility what so ever
of using any kind of hardware debug on the iMX6 platforms I have.

-- 
FTTC broadband for 0.8mile line: now at 9.7Mbps down 460kbps up... slowly
improving, and getting towards what was expected from it.
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