Messages in this thread | | | Date | Wed, 16 Oct 2002 13:59:17 +0200 (MET DST) | From | "Maciej W. Rozycki" <> | Subject | Re: mapping 36 bit physical addresses into 32 bit virtual |
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On Wed, 16 Oct 2002, jw schultz wrote:
> OK. I guess i'm wrong. It may be that the hardware was > locked into 32bit mode. The development period was a couple > of years so we were running on essentially 89-90 tech with a > faster clock.
I'm not sure if you can lock a MIPS system into the 32-bit mode at all, certainly not the processor -- it always runs with 64-bit operations enabled when in the kernel mode (for the user and supervisor modes it's selectable), though you may disable 64-bit addressing. A system may be incapable of 64-bit operation if its system controller doesn't support doubleword transfers on the host bus, but I'm not sure if it's possible to force an R4k CPU to only use 32-bit transfers for cache fills and writebacks. Probably not. So that's really the matter of software only.
-- + Maciej W. Rozycki, Technical University of Gdansk, Poland + +--------------------------------------------------------------+ + e-mail: macro@ds2.pg.gda.pl, PGP key available +
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