linux-kernel - Re: DMABOUNCE in pci-rcar

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Message-ID: <CAMuHMdX0kZhJyJFCQK7MUbv3nnKbqLkEJ2gnWMuHLSGLQvuQ2A@mail.gmail.com>
Date:	Thu, 20 Mar 2014 20:04:22 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Arnd Bergmann <arnd@...db.de>,
	Ben Dooks <ben.dooks@...ethink.co.uk>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Linux-sh list <linux-sh@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Magnus Damm <damm@...nsource.se>,
	Ben Dooks <ben-linux@...ff.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Simon Horman <horms+renesas@...ge.net.au>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: DMABOUNCE in pci-rcar

Hi Russell,

On Thu, Mar 20, 2014 at 7:39 PM, Russell King - ARM Linux
<linux@....linux.org.uk> wrote:
> That all said, what I find most annoying is that Ben has ignored my
> question about exactly what the nature of the limitation is on this
> platform.  My response to that is - if you're not going to do the
> curtesy of answering such a simple question, then you don't get to
> patch the kernel for this problem.

Ben did answer:
"If the window is set to 2GiB it can only access 2GiB aligned to 2GiB
 boundary, however DRAM spans a 2GiB boundary (being at 1-3GiB)"

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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