*BSD News Article 26534


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From: jmonroy@netcom.com (Jesus Monroy Jr)
Subject: Re: The DMA problem again!
Message-ID: <jmonroyCK6nxn.453@netcom.com>
Followup-To: comp.os.386bsd.development,comp.sys.ibm.pc.hardware.chips,comp.periphs
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References: <jmonroyCJxHBH.2x0@netcom.com> <1994Jan22.120513.8484@cc.usu.edu> <JARLE.94Jan25005138@drue.idt.unit.no>
Date: Tue, 25 Jan 1994 11:29:47 GMT
Lines: 45

Jarle Greipsland (jarle@drue.idt.unit.no) wrote:

: Oh boy, doesn't anyone else find this thread tiresome?  Now it gets worse!
:
:	:: [deleted a great recital]  ::
:

: What does all this mean then?  For one, the DMA channels are not used for
: refreshing! (Do you read me Mr. Monroy?) 
:
	Loud, Clear and Well....

: The refresh cycles are controlled
: by the system timer.  Second the refresh cycles can *not* preempt an ongoing
: DMA cycle.  It can, however, delay a DMA request for at most 5 sysclk cycles
: (which @ 8Mhz should be approximately 625 ns), which in itself is not
: enough to disrupt FDC DMA transfers.

: End of IBM AT discussion.

: So, back to your drivers & theories Mr Monroy....
:
	I am back... the matter at hand (your very fine examples)
	go back to the person (persons) that originated the idea
	and confirmed (to me) the correctness of it.
	
	I am not saying you are correct (and I/We are wrong).
	I am saying you presented the evidence clearly, without
	extranious jargon, and without prejudice to my positions.
	
	In short, a full review of the discussion will be made.
	My resonse will be ASAP.

	I thank you for your time and patience.

___________________________________________________________________________
Jesus Monroy Jr                                          jmonroy@netcom.com
Zebra Research
/386BSD/device-drivers /fd /qic /clock /documentation
___________________________________________________________________________
-- 
Jesus Monroy Jr                                          jmonroy@netcom.com
Zebra Research
/386BSD/device-drivers /fd /qic /clock /documentation
___________________________________________________________________________