linux-kernel - Re: [PATCH v2] arm64: dts: marvell: armada-37xx: Remap IO space to bus address 0x0

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Date:   Thu, 10 Mar 2022 11:22:38 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Pali Rohár <pali@...nel.org>
Cc:     Gregory CLEMENT <gregory.clement@...tlin.com>,
        Andrew Lunn <andrew@...n.ch>,
        Marek Behún <kabel@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] arm64: dts: marvell: armada-37xx: Remap IO space to
 bus address 0x0

On Thu, Mar 10, 2022 at 11:09 AM Pali Rohár <pali@...nel.org> wrote:
> On Thursday 10 March 2022 11:05:00 Gregory CLEMENT wrote:

> >
> > This patch has been refused by Arnd so I removed it from the mvebu/fixes
> > branch so you should not apply anything on top of it.
>
> Ok, so what is wrong with a change which increase size of IO space to 1 MB?

It should not cause any harm, but there is really no point in this if no known
devices use more than a few bytes, and Linux only maps the first 64KB of
the I/O space for each host bridge. I don't actually see where we limit the
size to 64KB, so maybe that changed recently.

        Arnd