linux-kernel - Re: [PATCH 02/15] ARM: limit OABI support to StrongARM CPUs

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Message-ID: <Z1B4aqtmfz19VMjv@shell.armlinux.org.uk>
Date: Wed, 4 Dec 2024 15:42:34 +0000
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Ralph Siemsen <ralph.siemsen@...aro.org>
Cc: Linus Walleij <linus.walleij@...aro.org>,
	Arnd Bergmann <arnd@...nel.org>, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, Arnd Bergmann <arnd@...db.de>,
	Aaro Koskinen <aaro.koskinen@....fi>, Andrew Lunn <andrew@...n.ch>,
	Ard Biesheuvel <ardb@...nel.org>, Daniel Mack <daniel@...que.org>,
	Gregory Clement <gregory.clement@...tlin.com>,
	Haojian Zhuang <haojian.zhuang@...il.com>,
	"Jeremy J. Peper" <jeremy@...emypeper.com>,
	Kristoffer Ericson <kristoffer.ericson@...il.com>,
	Krzysztof Kozlowski <krzk@...nel.org>,
	Mark Brown <broonie@...nel.org>,
	Robert Jarzmik <robert.jarzmik@...e.fr>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Tony Lindgren <tony@...mide.com>
Subject: Re: [PATCH 02/15] ARM: limit OABI support to StrongARM CPUs

On Wed, Dec 04, 2024 at 09:50:57AM -0500, Ralph Siemsen wrote:
> On Wed, Dec 4, 2024 at 8:59 AM Linus Walleij <linus.walleij@...aro.org> wrote:
> 
> > Hm why do we need a separate netwinder_defconfig if this defconfig already
> > supports it?
> 
> AFAIK footbridge_defconfig is for the "Compaq Personal Server", which
> is different than NetWinder. They could probably be reconciled by
> using devicetree and converting any platform devices. However testing
> could be a challenge, not sure who has working hardware anymore.

It's entirely possible to build one kernel that supports the EBSA285,
NetWinder and Compaq Personal Server. They're all the same machine at
the end of the day (PCI based SA110.) As long as the boot loaders pass
the correct machine type, the correct board file will be selected to
set things up.

However, if I remember correctly, Compaq seemed to be anti-mainline, so
didn't implement the machine ID and other things. I ended up
implementing a shim around the kernel to make mainline bootable on the
platform to correct the stuff that they couldn't be bothered to
implement. I may be adversely blaming them, as history from back then
is rather fuzzy, but I do remember mainline doesn't work because of all
sorts of weirdness they did.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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