Help! I cannot use DMA with my Buslogic BT 445s VLB

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3 total messages Started by Alexander Tuschel Tue, 26 Sep 1995 19:37

#12

Author: Alexander Tuschel
Date: Tue, 26 Sep 1995 19:37

15 lines
929 bytes

Hi!

I have a Buslogic BT 445s VLB SCSI Hostadapter and have a DMA problem:
The ASPI-drivers says that *no* DMA channel is used by rhe
SCSI-Adapter altough I have removed all my extra-cards (like Network
or SoundBlaster), so there should be enough free DMA channels.
Please help!

Thank you,
Alex

-----------------------------------------------
Dancebear says:"Keep on dancing - cha-cha-cha!"
e-mail: tanzbaer@ping.at
-----------------------------------------------

Re: Help! I cannot use DMA with my Buslogic BT 445s VLB

#13

Author: Robert Kuchta
Date: Tue, 26 Sep 1995 21:48

38 lines
1730 bytes

In <449o9o$d57@peng.ping.at> tanzbaer@ping.at (Alexander Tuschel)
writes: 
>
>Hi!
>
>I have a Buslogic BT 445s VLB SCSI Hostadapter and have a DMA problem:
>The ASPI-drivers says that *no* DMA channel is used by rhe
>SCSI-Adapter altough I have removed all my extra-cards (like Network
>or SoundBlaster), so there should be enough free DMA channels.
>Please help!
>
>Thank you,
>Alex
>
>-----------------------------------------------
>Dancebear says:"Keep on dancing - cha-cha-cha!"
>e-mail: tanzbaer@ping.at
>-----------------------------------------------
>

Alex

I'm a software developer and a BusLogic OEM. I hear this question at
least once a week on all BT cards.

The BT445 is a busmaster card. For all BT Busmaster boards, NO DMA
really means Busmastering or "I will use DMA when I need to and the DMA
controller and I will decide what DMA channel to use at any point in
time." The NO DMA reported is NO DMA CHANNEL PERMANENTLY SELECTED !! 

ASPI reports only the board setup and I believe the 445S does not even
have a setting for the DMA channel. 

And don't feel bad, the description of this is not in the 445s manual
and the text in the 445c manual has me calling the psychic hotline for
interpretation.

Bob

Re: Help! I cannot use DMA with my Buslogic BT 445s VLB

#14

Author: Leonard N. Zubkoff
Date: Tue, 26 Sep 1995 22:36

14 lines
1231 bytes

In article <449o9o$d57@peng.ping.at> tanzbaer@ping.at (Alexander Tuschel) writes:

  I have a Buslogic BT 445s VLB SCSI Hostadapter and have a DMA problem:
  The ASPI-drivers says that *no* DMA channel is used by rhe
  SCSI-Adapter altough I have removed all my extra-cards (like Network
  or SoundBlaster), so there should be enough free DMA channels.
  Please help!

Why do you want to use a DMA channel?  The 445S uses VLB bus-mastering to
do its work, and does not need a DMA channel assigned.  The ASPI driver is
merely reporting that fact, not complaining that it wants one and cannot
get it.  Other than this message, are you having a problem?

		Leonard

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