CVS commit: src/sys/arch/x68k/dev

["Izumi Tsutsui" <tsutsui%netbsd.org@localhost>]

Module Name:    src
Committed By:   tsutsui
Date:           Sat May 12 15:29:22 UTC 2012

Modified Files:
        src/sys/arch/x68k/dev: fd.c

Log Message:
Explicitly specify a proper FDC data register address for HD63450 DMAC
to avoid confusion.

Previous one (fdc->sc_addr + fddata) wasn't a right address for
the FDC's data register but one for the command register by accident,
but FDC ignores A0 address input (connected to A1 of x68k address bus)
during DMA xfer (i.e. when DACK is asserted) so it happened to work
as expected on the real X680x0 hardware, but caused trouble on emulators.

The inconsistency was found by Y.Sugahara during debugging XM6i emulator
(and it will be fixed in the next release).
FDC behavior during DMA is confirmed by uPD72068 hardware application note.

XXX: There is no proper MI API to specify DMA address for DMA controller
     (like MC68450) to access devices mapped to memory space by bus_space(9).


To generate a diff of this commit:
cvs rdiff -u -r1.97 -r1.98 src/sys/arch/x68k/dev/fd.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.