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

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Message-ID: <Yh9ruVkK1gikOuA1@lunn.ch>
Date:   Wed, 2 Mar 2022 14:06:01 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Pali Rohár <pali@...nel.org>
Cc:     Gregory CLEMENT <gregory.clement@...tlin.com>,
        Marek Behún <kabel@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: marvell: armada-37xx: Remap IO space to bus
 address 0x0

On Tue, Mar 01, 2022 at 10:25:39AM +0100, Pali Rohár wrote:
> On Monday 28 February 2022 17:42:03 Gregory CLEMENT wrote:
> > > Hello Pali,
> > >
> > >> Remap PCI I/O space to the bus address 0x0 in the Armada 37xx
> > >> device-tree in order to support legacy I/O port based cards which have
> > >> hardcoded I/O ports in low address space.
> > >>
> > >> Some legacy PCI I/O based cards do not support 32-bit I/O addressing.
> > >>
> > >> Since commit 64f160e19e92 ("PCI: aardvark: Configure PCIe resources from
> > >> 'ranges' DT property") this driver can work with I/O windows which
> > >> have
> > >
> > > Should we add a "Fixes: 64f160e19e92 ("PCI: aardvark: Configure PCIe
> > > resources from 'ranges' DT property")" tag ?
> > 
> > Waiting for your confirmation I tried to applied it but it failed.
> > 
> > Did you base this patch on v5.17-rc1 ?
> > 
> > Gregory
> 
> Hello! This change is breaking booting of Turris Mox kernel with older
> bootloader due to bugs in bootloader.

Do you know what actually goes wrong?

I've not been involved in the discussion, but looking at the comments
above, not changing the space can result in non-working cards. So it
does sound like something which in general we want to do. Does the
current code assume the bootloader has initialized some registers with
specific values? Can that be moved into the driver so it also works
with older bootloaders?

     Andrew