problems in SCC-UART in mpc860

[Mark A. Greer]

What's the PVR of your 860?

Mark
--

nbasker at india.tejasnetworks.com wrote:

>Hi:
>
>I am trying to use a SCC configured in UART to communicate with a intel
>pc via modem. The configuration is simple and shown below
>
>target --- modem -------phoneline---- modem----i386pc
>
>target configuration:
>1. mpc860T custom board
>2. scc2 configured in uart
>3. linux-2-2-14 from montavista
>4. patched 8xx_io/uart.c from 2.2.4 kernel from Denks
>5. using mgetty/pppd to program modem and start pppd.
>
>host configuration:
>1. i368pc running 2.2.14-12 redhat kernel
>2. using pppd/chat to dialup to target modem.
>
>In this setup if use PCSO to enable RTS, CTS and CD along with
>crtscts option in pppd nothing works. If I disable PCSO and use
>nocrtscts option in pppd, LCP connection goes through but IPCP
>exchange at target fails (it never sends ConfigAck packet towards host).
>
>I am able to get the setup working using null modem cable enabling
>RTS/CTS/CD via PCSO register as well as pppd options.
>
>Since I am able to get SCC2/UART working with nullmodem, but not
>with actual modem, should I suspect hardware signal connectivity as
>a problem source?. I suspected the uart driver and went through
>all the register settings described in Section 23.21 of 860T user
>manual and everything seems to be fine.
>
>Any hint or help on this issue will be greatly appreciated.
>
>Thanks for your time,
>Nicholas.
>
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