linux-kernel - Re: [PATCH 00/36] AArch64 Linux kernel port

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Date:	Tue, 17 Jul 2012 02:53:38 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Catalin Marinas <catalin.marinas@....com>,
	Pavel Machek <pavel@....cz>, Ingo Molnar <mingo@...nel.org>,
	Olof Johansson <olof@...om.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Russell King <linux@....linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [PATCH 00/36] AArch64 Linux kernel port

On Sun, Jul 15, 2012 at 07:43:07PM +0000, Arnd Bergmann wrote:
> Yes, I agree that's the best way to handle this. Compared to other
> architectures, I think x86 is the only that allows booting either a
> 32 or 64 bit kernel on the same system. We used to support 32 bit
> kernels on 64 bit PowerMac, but nobody used it and we discontinued
> it long ago. Tile 64 bit is actually incompatible with 32 bit kernels
> at the architecture level and would require a third mode. On sparc,
> parisc and mips, AFAIK we could support 32 bit kernels on 64 bit
> machines, but never did.

On mips it works just fine.  On Sparc I don't think Linux ever did it,
but Solaris did for a long time, as did (IIRC) NetBSD/OpenBSD.

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