Nicolas Souchu (nsouch@teaser.fr)
Wed, 9 Dec 1998 01:08:17 +0000
On Wed, Dec 09, 1998 at 12:22:38AM +0000, Nicolas Souchu wrote:
>
>Hi guys,
>
>On Tue, Dec 08, 1998 at 07:37:39PM +0000, Tim Waugh wrote:
>>
>>> At least in my application it doesn't make sense
>>> to use ECP when the hardware doesn't directly support it.
>>
>>The only reason it would be necessary is if the peripheral ONLY speak ECP
>>mode, and we don't have the hardware for it.
>
>Then, the peripheral is not IEEE1284 compliant. But,
>
> - peripheral behaviour may be easier to analyze with emulation
> (OfficeJet development is an example)
> - when 2 hosts exchange data, one of them, with full ECP support,
> may want to take advantage of DMA+hardware_handshake
> - just for fun
>
>BTW, Tim, did you think about host<->host operations? The main issue is
>reverting the negociation with only 4 control lines against 5 status lines.
>
>I talk to you about this in order to get FreeBSD<->Linux _compatible_ for
>an ECP/EPP-IP interface. A nice challenge... just with IEEE1284 specifications.
>I'm about to install a Linux box to get the old-style lp/plip Linux stuff
>work with our new ppbus interface.
BTW, you may have a look to the recent web page:
http://www.freebsd.org/~nsouch/ppbus.html
Nicolas.
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