Subject: Re: needs MI wdc changes to support macppc's wdc
To: Izumi Tsutsui <firstname.lastname@example.org>
From: Allen Briggs <email@example.com>
Date: 10/25/1998 09:24:18
> I'd like to use the MI wdc.c for it, but offsets of registers
> defined in wdcreg.h don't match macppc's wdc registers.
> The offsets of macppc's wdc registers are aligned every 16 bytes.
> On the other hand, atari's wdc has also non-contiguous offsets
> but atari's mb_bus_space_*() functions handle it as contiguous.
> I heard that mac68k's wdc had non-contiguous offsets, too.
The mac68k wdc has non-contiguous offsets, too. I think it's also every
16 bytes. I think that the cleanest solution is to make the bus_space*()
functions handle the register addressing, but I don't know if anyone has
measured any performance penalties that you might incur from doing so
(for the regions that don't need the offset modified).
Allen Briggs - firstname.lastname@example.org
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