Date: Sat, 20 Sep 2003 18:07:13 -0700 (PDT) From: Mike Harding <mvh@ix.netcom.com> To: arg-bsd@arg.me.uk Cc: freebsd-stable@freebsd.org Subject: Re: HP Laserjet 1200 on USB Message-ID: <20030921010713.874615356@netcom1.netcom.com> In-Reply-To: <20030920200224.B33574@server.arg.sj.co.uk> (message from Andrew Gordon on Sat, 20 Sep 2003 20:10:26 %2B0100 (BST)) References: <87fzisoi53.fsf@strauser.com> <200309201340.02453.ianjhart@ntlworld.com> <200309201551.19467.ianjhart@ntlworld.com> <20030920200224.B33574@server.arg.sj.co.uk>
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Thanks! I was never able to get DMA to work with my printer... Note that the ppc manpage, and the LINT file, don't mention drq at all! And lptcontl -e didn't indicate any problems either - it just indicated 'polled' mode. Somebody should update the ppc manpage, at least... X-Original-To: mvh@localhost Date: Sat, 20 Sep 2003 20:10:26 +0100 (BST) From: Andrew Gordon <arg-bsd@arg.me.uk> X-X-Sender: freebsd@server.arg.sj.co.uk Cc: freebsd-stable@freebsd.org Sender: owner-freebsd-stable@freebsd.org X-Spam-Status: No, hits=3D-6.2 required=3D5.0 tests=3DAWL,BAYES_01,EMAIL_ATTRIBUTION,IN_REP_TO,QUOTED_EMAIL_TEXT, RCVD_IN_OSIRUSOFT_COM,REFERENCES,REPLY_WITH_QUOTES version=3D2.55 X-Spam-Level:=20 X-Spam-Checker-Version: SpamAssassin 2.55 (1.174.2.19-2003-05-19-exp) On Sat, 20 Sep 2003, Dag-Erling [iso-8859-1] Sm=F8rgrav wrote: > > 20 MB in five minutes is very close to the maximum transfer rate > across a paralell port (~80 kBps). You can do much better than that in ECP mode - I use it to transfer 2Mbit/sec video to a piece of custom hardware hung of the parallel por= t (standard drivers at the FreeBSD end), so I'm getting over 250KByte/se= c. However, the GENERIC kernel isn't configured for this - you need to ad= d the DRQ setting: device ppc0 at isa? irq 7 drq 3 and make sure that the BIOS is configured to match. After that, lptcontrol -e engages DMA-driven printing, with much greater speed and lower CPU utilisation. _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.o= rg"
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