Daniel E. Ungar (dan@pgt.com)
Mon, 23 Nov 1998 10:16:34 -0500
Hi Tom,
I *had* started down this path, but just when I'd given myself
enough background to be useful, I was pulled off and put on
something else last Friday.
I've had several e-mail conversations with you and others since
I started out a month ago. Below is a brief synopsis of who
has said that they're involved in ECP during that period.
Dan
> Date: Thu, 15 Oct 1998 16:34:52 -0400
> From: "Daniel E. Ungar" <dan@pgt.com>
> ...
> Before I start reinventing the wheel, is there anyone who has
> added IEEE-1284 ECP mode support to the parallel port driver for
> Linux?
> Date: Fri, 16 Oct 98 08:16:34 +0100
> From: Roger Schreiter <schreite@helena.physik.uni-stuttgart.de>
>
> yes, as David Campbell already mentionned, there is something
> supporting IEEE1284 modes.
> I posted it as patch for the 2.1.123 kernel some days ago.
> The code is still under developement - it works fine and
> stable, but there is not yet support for "everything".
>
> E.g. ECP is supported so far for non-ECP parports, so ECP
> is emulated by software. ECP via a real ECP parport is to be
> added soon.
> Date: Fri, 16 Oct 1998 15:06:52 -0400
> From: Dave Dillow <dillowd@ornl.gov>
>
> I've got an ECP version of lp that may help you. It does DMA to the
> printer, but not from it.
> ...
> The only problem is getting the O.K. to release it from my company.
> Date: Mon, 19 Oct 1998 10:25:44 +0200
> From: Thomas Sailer <sailer@ife.ee.ethz.ch>
> ...
> I'm in *exactly* the same position :-) And since I also have to
> download
> the FPGA bitstream in SPP mode, it does not make much sense to implement
> negotiation, as the host knows what the firmware can do it downloads.
>
> So there's definitely a need to bypass most of IEEE 1284 ECP, esp.
> negotiation.
> Date: Thu, 29 Oct 1998 13:10:11 -0800
> From: Daniel Maddy <danielm@jetdrivers.com>
> I have tried to get ECP with DMA to work on the PC platform with only moderate success.
> I have had better luck with using the FIFOs in a programmed IO mode. About half of the
> computers seem to be broken when trying to use ECP with DMA. I had the best luck
> with the newer National Semiconductor chips and found problems with the SMC chips. I
> would be interested in seeing how much luck you have with ECP with DMA since we
> shelved >
> ...
> P.S. All of our work was with Microsoft Operating systems
> Date: Thu, 29 Oct 1998 21:33:43 +0000
> From: Uwe Klein <uwe.klein@flensburg.netsurf.de>
> ...
> well i first did some test with the "hardware enhanced" mode 010
> ...
> Next step was to implement DMA and last Step was
> ECP and reverse transfers.
> well everything works, but no reverse transferneither Pio nor DMA; bah
> :((
> Date: Fri, 30 Oct 1998 00:00:17 +0000
> From: Uwe Klein <uwe.klein@flensburg.netsurf.de>
> ...
> this file looks terrible.
> the base is lp.c as modified by the parport patch for 2.0.33.
> [attachment: lpp.c]
> Date: Mon, 02 Nov 1998 13:45:26 PST
> From: "Martin Giguere" <zefrench@hotmail.com>
> ...
> I just found this old file
> ftp://ftp.picturel.com/pub/source/bpp.tar.gz (date 1996)
>
> It is suppose to add support for IEE1284 to Linux.
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