[PATCH v1 0/9] Enable SMP for pc386 based bsps

[Joel Sherrill]

On Tue, Jun 16, 2020 at 7:08 AM <Jan.Sommer at dlr.de> wrote:

>
>
> > -----Original Message-----
> > From: Chris Johns [mailto:chrisj at rtems.org]
> > Sent: Tuesday, June 16, 2020 10:18 AM
> > To: Sommer, Jan; devel at rtems.org
> > Subject: Re: [PATCH v1 0/9] Enable SMP for pc386 based bsps
> >
> > On 11/6/20 12:21 pm, Chris Johns wrote:
> > > On 1/6/20 12:22 am, Jan Sommer wrote:
> > >> Hello,
> > >>
> > >> Here is a patch set which should enable SMP again for the pc386-based
> > BSPs (mainly tested with pc686).
> > >
> > > Many thanks for these patches and your efforts.
> > >
> > >> So far I only tested it with qemu. Tests on real hardware are pending.
> > >
> > > It would be good to test results for hardware with SMP disabled. If
> the test
> > > results do not show any regressions then I am fine with these patches
> for
> > RTEMS
> > > 5.2 with SMP documented as experimental. I will take a look at doing
> this.
> >
> > I have finally managed to get my test PC to load a iPXE loader and with
> that I
> > can boot RTEMS. Without the changes I can run hello.exe and it prints the
> > right
> > stuff on the monitor however the iPXE boot command line that use to work
> > ...
> >
> > chain tftp://10.10.5.2/rtems.exe --console=/dev/com1,115200
> > --printk=/dev/com1,115200
> >
> > ... does not generate any serial output. The output is being redirected
> and
> > the
> > serial port because nothing appears on the monitor and I tested the
> cable is
> > working with a loop-back jumper.
> >
>
> Sorry for the delay, we had some problems in our lab setup as well.
> It is working now again and I could receive the output of ticker via the
> serial line.
> I hope I can run the testsuites in the coming nights. Then I can respond
> to your other comments.
>
> Do you have a chance to check the pins of you serial port with an
> Oscilloscope?
> Our board allows in the BIOS to configure the serial port for different
> protocols (RS232 and RS422) maybe some pin mappings are not correct?
>
> Maybe it is of any help to you. Our ipxe script looks like this:
>
> echo Trying to receive IP-address...
> dhcp || goto dhcp_failed
> echo Received the following IP settings:
> route
> chain tftp://${net0/next-server}/ticker.exe --console=/dev/com1,115200
>
> :dhcp_failed
> echo Failed to acquire configuration via dhcp.
> echo Opening shell...
> shell
>

We had this problem trying to set up the embedded PC we use for testing in
the new lab.
When we tried the same hardware with FreeDOS, it worked. When we tried an
old Dell
desktop as the RTEMS PC, the serial port didn't work.

We tried various combinations of computers running RTEMS and the comms
program.
The only common denominator was the one running RTEMS wouldn't give serial
output.

I have these patches ready to push. Chris.. should I push them?

--joel


>
> Best regards,
>
>    Jan
>
> > Is the PC serial port driver broken?
> >
> > Chris
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