linux-kernel - Re: [PATCH] ARM: remove ARM710 specific assembler code

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Message-ID: <4437236.32BrGIk46D@wuerfel>
Date:	Tue, 20 May 2014 22:09:48 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Tony Lindgren <tony@...mide.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Paul Bolle <pebolle@...cali.nl>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ARM: remove ARM710 specific assembler code

On Tuesday 20 May 2014 09:05:13 Tony Lindgren wrote:
> * Arnd Bergmann <arnd@...db.de> [140519 04:27]:
> > On Saturday 17 May 2014 10:56:02 Catalin Marinas wrote:
> > 
> > For the case of ARM710T, I think the last remaining user that can be
> > configured is mach-integrator, but I don't know if anybody even has that
> > CPU tile, or wants to keep using it. If Russell and Linus as the only
> > people that have cared about Integrator in the past years want to
> > cut down the number of supported CPUs, that would be a different matter:
> > quite a number of CPUs are not supported in any other platform.
> > Note that the integrator target in qemu does not support any ARM7, only
> > StrongARM, ARM9 or later. I also double-checked about mach-clps711x,
> > but I'm pretty sure those SoCs are all either ARM710a (no longer supported)
> > or ARM720T (quite active).
> 
> Hmm I don't think mach-integrator is using ARM710T?

I don't know, we don't have a separate Kconfig option, so ARM710T and ARM720T
use the same CONFIG_CPU_ARM720T symbol that can be enabled for integrator.
Without any further information, I assumed that both might potentially be used.

> The ARM710T was done by NEC and was used by the Psion MX hardware.
> It's very close to ARM720T as far as I remember so might as well keep
> the CPU support for it as that's just a few lines of code in the
> mainline kernel.
> 
> I don't think we have any mach directories using ARM710T, but I
> would not be surprised if somebody comes along with device tree
> based booting patches for Psion MX at some point.

Of course, if someone does this, the CPU support would be the least
of their work ;-)

Just out of curiosity: was that NEC 710T a SoC that replaced the
CL/PS7110, or a standalone CPU that Psion combined with a custom
ASIC?

	Arnd
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