Re: Prevent duplicate bus_space_map for TURBOchannel?

[Felix Deichmann <m4j0rd0m0%gmail.com@localhost>]

2016-05-04 0:26 GMT+02:00 David Brownlee <abs%netbsd.org@localhost>:
>> Trying to use a TC driver under VAX, I hit the point where a "duplicate"
>> bus_space_map is necessary/performed: The generic TC stuff in tc.c,
>> especially tc_checkslot(), wants to access memory space by pointers and
>> "linearly", so for VAX TC, I must map physical space before (which is the
>> same as calling bus_space_map), for example in tc_vsbus.c before calling
>> tcattach().
>> The TC device drivers attached by tc(4) again will call bus_space_map, which
>> can lead to multiple allocations of the same region.
>>
>> [...]
>
> You might want to ask on one of the more general tech-kern@ or similar
> list - as the specific concepts are probably not VAX or even
> TURBOchannel specific :)

True, but as the other platforms seem to work like that and a change
would be needed for VAX only, I hoped to get some ideas here first. On
to tech-kern@ then.

Felix