> 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 +- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/