Serial Port problem with 823e on Embedded Planet

Serial Port problem with 823e on Embedded Planet

[Pergola, Michael]

All,

I have an Embedded Planet with a LITE_DW Motorola 823 PPC using a HIOX
interface board. I am trying to debug a program sending out data from
ttyS1 and reading it back in on ttyS2. The latest patch has been applied
for the tty ports (kernel 2.2.14).

I want to be able to send any char over the serial link, so I've resorted to
using "raw" mode. The problem is that if an overrun occurs on the receive
side, there is nothing I can sense to indicate this situation. Has anyone
run into this problem and/or is there a solution to my dilemma?

Regards,
     Michael Pergola
     Software Engineer
     Danfoss Air-Conditioning & Refrigeration Division
     7941 Corporate Blvd.
     Baltimore, MD  21236     (410) 931-8250 x4259


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Re: Serial Port problem with 823e on Embedded Planet

[Wolfgang Denk]

Dear Michael,

in message <E1836A7F3557D311A14000805F9F36FCD4E383@usdfo011.usac.danfoss.net> you wrote:
>
> I have an Embedded Planet with a LITE_DW Motorola 823 PPC using a HIOX
> interface board. I am trying to debug a program sending out data from
> ttyS1 and reading it back in on ttyS2. The latest patch has been applied

I guess you are using the SMC ports for the ttyS* ?

> I want to be able to send any char over the serial link, so I've resorted to
> using "raw" mode. The problem is that if an overrun occurs on the receive
> side, there is nothing I can sense to indicate this situation. Has anyone
> run into this problem and/or is there a solution to my dilemma?

In raw mode you're kind of lost - the SMC's don't have any  handshake
signals.

You could switch to use SCC's instead. We have a modified driver that
supports full HW handshake on all SCC's (and you  can  configure  the
number and size of I/O buffers to optimize for throughput).


Wolfgang Denk

--
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd@denx.de
A direct quote from the Boss: "We passed over a lot of good people to
get the ones we hired."

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Re: Serial Port problem with 823e on Embedded Planet

[Matthew Locke]

Pergola, Michael wrote:


>>You could switch to use SCC's instead. We have a modified driver that
>>supports full HW handshake on all SCC's (and you  can  configure  the
>>number and size of I/O buffers to optimize for throughput).
>>
>>
> 	[Pergola, Michael]  Is that  the patch commproc.c.patch.gz dated
> 	07/20/2000?
>
>
>


If you use both SCCs for uarts, you lose ethernet.


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Re: Serial Port problem with 823e on Embedded Planet

[Wolfgang Denk]

Dear Michael,

in message <E1836A7F3557D311A14000805F9F36FCD4E385@usdfo011.usac.danfoss.net> you wrote:
>
> > You could switch to use SCC's instead. We have a modified driver that
> > supports full HW handshake on all SCC's (and you  can  configure  the
> > number and size of I/O buffers to optimize for throughput).
> >
> 	[Pergola, Michael]  Is that  the patch commproc.c.patch.gz dated
> 	07/20/2000?

No, this was added only lately. I did not prepare a  patch  for  this
yet. See the source tree at
ftp://ftp.denx.de/pub/LinuxPPC/usr/src/linux-2.4.4-2001-05-12.tar.bz2 ,
plus the patch at
http://lists.linuxppc.org/listarcs/linuxppc-embedded/200106/msg00220.html

Wolfgang Denk

--
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd@denx.de
Yes, it's a technical challenge, and  you  have  to  kind  of  admire
people  who go to the lengths of actually implementing it, but at the
same time you wonder about their IQ...
         --  Linus Torvalds in <5phda5$ml6$1@palladium.transmeta.com>

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