Rene Herman wrote: > On 09/17/2007 10:14 AM, Clemens Ladisch wrote: > > Krzysztof Helt wrote: > >> Should the OPL4 detection has the same fallback or just all Opti cards > >> should search the FM chip at the range + 8 address? > > > > It appears a fallback shoudn't be needed because the chip always returns > > a range suitable for an OPL4. > > > > Since an OPL3 range is never larger than 8 bytes, and OPL4 needs 16 > > bytes, we could add 8 to get the FM address _if_ the range is at least 16 > > bytes; thus we are safe even if a chip publishes an OPL3-only range. > > At least 16 won't do -- the OPTi chip provides a 12-byte range. More than 8 > would work, but just +8 is fine. I have all OPTi ISA-PnP chips (924, 925, > 931, 933) and more aren't going to be produced. The 0x380 base is what it > calls the OPL4Base and ALBase (AdLib) is at 0x388. Are there chips that have both OPL4Base and ALBase? > The chip can defer to external FM it seems, but even if there are OPTi/OPL4 > combo's out there in the wild (I sort of doubt it) Why? > the driver's just doing opl3 anyway. ie, still needs just the +8. Only the 93x driver; the 92x driver has OPL4 support. Regards, Clemens _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
