SCC or SMC for console ?
Wolfgang Denk
wd at denx.de
Fri Feb 15 05:31:58 EST 2002
Dear Laurent,
in message <3C6BF3B1.2040906 at capflow.com> you wrote:
>
> I need 4 serial ports at runtime, and was wondering if I should rather
> use 2SMC + 2SCC or 4 SCC (or 1SMC + 3SCC).
Assuming that you need Ethernet: if you can use the FEC for Ethernet,
that it does not matter much; otherwise I'd recommend to use 2SMC +
2SCC or 1SMC + 3SCC so that you have at east one SCC left for
Ethernet.
> I need a console, but no hardware flow control (which would force the
> use of SCC).
Should be no problem. The kernel on our FTP server was tested with 6
serial ports on a MPC860, with HW flow controll on all SCC's. The
only problem in such a configuration is that you have only 4 BRG's so
two ports have to share the baudrate with another port.
Wolfgang Denk
--
Software Engineering: Embedded and Realtime Systems, Embedded Linux
Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email: wd at denx.de
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