Serial issue

Serial issue

[Lee Revell]

I'm trying to connect to a Yosemite 440 PPC board using the serial
console.  I've tried everything in every Linux Serial FAQ and HOWTO but
no matter what, I can receive but I cannot transmit.

I know the cable is good, and the PPC board seems OK as I can see all
the boot messages.  Could it be a bug in my host's serial port?  I'm
using a Via EPIA M6000.

$ sudo cat /proc/tty/driver/serial
serinfo:1.0 driver revision:
0: uart:16550A port:000003F8 irq:0 tx:0 rx:5379 oe:7 RTS|DTR|DSR|CD

No matter what I do, tx bytes is stuck at 0.  I've tried irq 0 (polling)
and irq 4.  No difference at all.

Help...

Lee

Re: Serial issue

[Wolfgang Denk]

In message <1153950324.2927.6.camel@mindpipe> you wrote:
> I'm trying to connect to a Yosemite 440 PPC board using the serial
> console.  I've tried everything in every Linux Serial FAQ and HOWTO but
> no matter what, I can receive but I cannot transmit.

Did you disable hardware flow control in your communication program?

Which communication program do you use, btw? I recommend C-kermit;
for details see also
http://www.denx.de/wiki/view/DULG/SystemSetup#Section_4.3.?stickboard=yosemite

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de
How many seconds are there in a year? If I tell you there are 3.155 x
10^7, you won't even try to remember it. On the other hand, who could
forget that, to within half a percent, pi seconds is a nanocentury.
                                                - Tom Duff, Bell Labs

Re: Serial issue

[Lee Revell]

On Wed, 2006-07-26 at 17:45 -0400, Lee Revell wrote:
> I'm trying to connect to a Yosemite 440 PPC board using the serial
> console.  I've tried everything in every Linux Serial FAQ and HOWTO but
> no matter what, I can receive but I cannot transmit.

I've resolved the problem - unlike my reference system, with this host,
hardware flow control must be disabled for it to work.

Sorry for the noise.

Lee