>In the long run I think you're right, but I was trying to deal with
>the fact that the parport ECP mode doesn't work unless DMA is used.
Can you be more specific about what goes wrong with it? In theory it should
be possible to negotiate into (and use!) ECP mode on any port -- if hardware
assistance isn't available, parport will perform ECP protocol in software.
>From the lp point of view using software-ECP is probably a bad thing for
performance, but it should still work the same and I think we should retain
the ability for drivers to do this if they want to, say if some particular
peripheral functionality is only available in ECP mode.
Having thought about it some more, I'm now convinced that parport_pc should
only set bits in port->modes when a particular mode is both supported by the
underlying hardware and available in this configuration. It sounds like there
might still be other bugs, but that should be enough to make your particular
problem go away. Could you produce a patch to do that, plus a modified
version of your lp.c change?
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This archive was generated by hypermail 2b29 : Mon Aug 27 2001 - 13:33:50 EDT