Alan Cox wrote:
However, assuming a bus clock of 6 MHz should be safe (167 ns).
Agreed - or ISA timings directly. Boxes using WD80x3 are not going to
have a TSC so might as well stick with port 0x80 as they have done just
fine for the past 15 years.
None of this really helps with *memory-mapped* 8390, though, since
memory mapped writes can be posted. Putting any IOIO transaction in the
ISA isn't posted only PCI.
PCI 8390 clones seem to be a mix of ASICs and 8390x chips with
some quite disgusting FPGA glue logic.
ISA isn't posted no, but on several chipsets the upstream PCI bus will
post MMIO writes to ISA space regardless of the spec.
-hpa
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