26-Apr-2024 17:41 GMT.

UNDER CONSTRUCTION

[Forum] AmigaOne's *software* DMA ANN.lu Posted on 05-Jul-2004 01:07 GMT by atmel 24 comments View flat View list I would like to know why the AmigaOne has a software-based DMA instead of having a northbridge that has hardware DMA built-in? List of all comments to this article Sorted by date, most recent at bottom Comment 1 Anonymous 04-Jul-2004 23:15 GMT Comment 2 tinman 04-Jul-2004 23:34 GMT Comment 3 Anonymous 05-Jul-2004 02:48 GMT Comment 4 Anonymous 05-Jul-2004 02:55 GMT Comment 5 the man in the shadows 05-Jul-2004 03:12 GMT Comment 6 priest 05-Jul-2004 05:33 GMT Comment 7 priest 05-Jul-2004 05:40 GMT Comment 8 Hagge 05-Jul-2004 05:48 GMT Comment 9 Peter Gordon 05-Jul-2004 06:25 GMT Comment 10 bennymee 05-Jul-2004 07:13 GMT Comment 11 goodone 05-Jul-2004 07:30 GMT Comment 12 Kjetil 05-Jul-2004 11:31 GMT Comment 13 Amon_Re Registered user 05-Jul-2004 12:11 GMT Comment 14 goodone 05-Jul-2004 14:16 GMT Comment 15 Johan Rönnblom 05-Jul-2004 15:11 GMT Comment 16 Kjetil 05-Jul-2004 19:09 GMT Comment 17 goodone 05-Jul-2004 20:37 GMT Comment 18 Anonymous 05-Jul-2004 22:23 GMT Comment 19 hammer 06-Jul-2004 01:25 GMT Comment 20 hammer 06-Jul-2004 01:34 GMT Comment 21 hammer 06-Jul-2004 01:48 GMT AmigaOne's *software* DMA : Comment 22 of 24 ANN.lu Posted by Peter Gordon on 06-Jul-2004 06:23 GMT In reply to Comment 18 (Anonymous): A clue for mr. anonymous: Thats not DMA... if anything its a pseudo DMA. They're saying that they'll set up and interrupt server that will copy small packets of data upon receipt of an interrupt signal, using.... dun dun duuuun the ARM processor, or CPU. This means that the program running in userland doesn't have to do the copy himself, but it is STILL the processor doing the copy, and that copy is stealing cycles from the said userland program. This technique could be used to make the ARM some kind of pseudo DMA controller if it wasn't the main processor in the system, IE the main processor tells the "DMA" ARM to start copying a file, and sets up a timer to interrupt it regularily from whatever other tasks it has to copy data around. The AmigaOne, however, doesn't do any of that. So your amazing link has nothing to do with the point in hand and just proves you know how to use google, not that you have a clue what you're talking about. Jump... #23 Don Cox Top Previous comment Next comment bottom List of all comments to this article (continued) Comment 23 Don Cox Registered user 06-Jul-2004 07:27 GMT Comment 24 Peter Gordon 06-Jul-2004 09:54 GMT

User Menu User Login Nickname: Password: About ANN archives The ANN archives is powered by #AmigaZeux. It was updated daily (news last: 22-Oct-2004; comments last: 18-May-2005). ANN.lu was created, previously owned and maintained by Christian Kemp, www.ckemp.com. Contribute Not possible at this time! Search ANN archives Advanced search Hosting ANN.lu was hosted by Dreamhost. Sign up through this link, mention "ckemp" as referrer and he will get a 10% commission on any account you purchase. Please show your appreciation for any past, present and future work on ANN.lu by making a contribution via PayPal.

Back to Top