The modem uses a Rockwell RP336LD Modem Data Pump (I don't really know what
this means?).  I am guessing that this sends the data to the processor which
then emulates a UART.  So I guess it wouldn't be that easy to port a
linmodem to NetBSD.  Anybody have any idea how to start making a driver?

Thanks Ben

> -----Original Message-----
> From: Thomas Miller [mailto:thomas.miller@lycos.com]
> Sent: Thursday, November 14, 2002 6:29 PM
> To: Benjamin David Sexson
> Subject: RE: z50 Internal Modem Device Name
>
>
> Hi,
>
> I am not certain I understand all this completely correctly, but . . .
>
> One of the critical hardware items missing from a Winmodem is
> something called a UART.  Winmodems work by shifting the
> processing work from the UART to the central prucessing unit.
>
> When I saw ns6550a (or whatever) in the dmesg, I assumed that
> this meant the modem was a "hardware" modem, because ns6550a is
> the designation of a type of UART.
>
> Actually, however, it appears from the comments on the list the
> NEC 4121 processor in the z50 has UART emulation built into the
> hardware of the processor.  Therefore, there needs to be a
> special driver written for this particular NEC chip so that the
> NetBSD kernel can access the UART at a different address than
> where the UART would be if the UART were a regular UART in a
> "hardware" modem.  This driver would be different from the
> Winmodem type driver because the Winmodem driver would provide
> software UART emulation rather than simply accessing the VR4121
> hardware UART at a different location than usual.
>
> Again I am not sure all this is correct, but hope it helps.
> Until someone gets around to writing the driver, we have to use
> pcmcia or external modems in our z50s.  My z50 works fine with
> both types; you can pick one up for ten or twenty buscks on ebay.
>
> Kindest regards,
>
> Tom
>
> thomas.miller@lycos.com
> (Thomas Miller)
> (617) 248-8900
>
> Any following text may include a message which was added by Lycos
> and which is not a communication from me.
>
>
>
>
>
> On Wed, 13 Nov 2002 20:38:10
>  Benjamin David Sexson wrote:
> >Is this one of the linmodem drivers? one of the LT drivers and how do you
> >get it to work?
> >
> >> -----Original Message-----
> >> From: port-hpcmips-owner@netbsd.org
> >> [mailto:port-hpcmips-owner@netbsd.org]On Behalf Of Thomas Miller
> >> Sent: Tuesday, November 12, 2002 7:51 PM
> >> To: M. Warner Losh
> >> Cc: port-hpcmips@netbsd.org
> >> Subject: Re: z50 Internal Modem Device Name
> >>
> >>
> >> On Tue, 12 Nov 2002 17:40:32
> >>  M. Warner Losh wrote:
> >> >
> >> >The Vr4121 and Vr4111 docs have enough information to >write a
> >> driver for this modem (if they use the one that's >mostly built
> >> into the Vr41xx CPU), but no one has done so.
> >>
> >> Greg's kernel finds the modem:
> >>
> >> z50# dmesg | grep com0
> >> com0 at vr4102ip0 addr 0x0c000000-0007:
> >> ns16550a, working fifo
> >>
> >> When I saw the ns16550a I figured it ought to work.
> >>
> >>
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> >
> >
>
>
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