Problems with 16-Bit DMA ?

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altheos
Posts: 37
Joined: Wed 24 Feb, 2016 7:27 pm

Problems with 16-Bit DMA ?

Postby altheos » Fri 16 Jun, 2017 1:49 pm

Hello,
I'm trying to put Ultrasound on 16 bit DMA but setup test keeps failing :
Cap2.PNG
Cap2.PNG (16.27 KiB) Viewed 390 times

Pcem detect that it's a 16-bit DMA (here dma channel is 0x5), but I can't go any further.
Is the GUS test accurate for 16 bit DMA or not ?

Thanks.
Battler
Posts: 793
Joined: Sun 06 Jul, 2014 7:05 pm

Re: Problems with 16-Bit DMA ?

Postby Battler » Fri 16 Jun, 2017 2:48 pm

AMIDIAG's Sound Blaster 16 tests mostly fail as well, so I suspect there's indeed something wrong with the DMA.
SarahWalker
Site Admin
Posts: 1325
Joined: Thu 24 Apr, 2014 4:18 pm

Re: Problems with 16-Bit DMA ?

Postby SarahWalker » Fri 16 Jun, 2017 8:01 pm

Two bugs here. Firstly there are some typos in 16-bit DMA handling, probably introduced when adding PS/2 support. These are fixed in rev 768.

Secondly, the GUS code had no real support for 16-bit DMA. This is fixed in rev 769.
altheos
Posts: 37
Joined: Wed 24 Feb, 2016 7:27 pm

Re: Problems with 16-Bit DMA ?

Postby altheos » Sat 17 Jun, 2017 4:32 pm

Thanks sarah. I tried to dig into your code but i was stuck into this loop thinking that gus supported 16-bit DMA.

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