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

From: Christoph Hellwig
Date: Tue Jul 17 2012 - 02:53:47 EST

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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