From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Ling Su" <lingsu@palmmicro.com>
To: <ecos-discuss@sources.redhat.com>
Subject: Re: [ECOS] Re: Fw: [ECOS] diag serial port and debug serial port conflict?
Date: Wed, 30 Aug 2000 10:33:00 -0000
Message-id: <00f101c012a8$64510190$0201a8c0@raccoon>
References: <008a01c012a4$88abf080$0201a8c0@raccoon> <poya1eekbu.fsf@balti.cygnus.co.uk>
X-SW-Source: 2000-08/msg00342.html

I traced the mailinglist, only find Charles suggestion to delete the "-O2"
option. Charles, I am not sure if you still listen to this list, could you
please give me any advices?

Thanks!

-Ling


> "Ling Su" <lingsu@palmmicro.com> writes:
>
> > I met the same problem as descriped in following message, and I tried
what
> > Nick siad, actually I doubled the ZDEL, the result is the same. Any
> > suggestion? Thanks!
> >
>
> I do not now recall what the final solution to this problem was, but I
> know it was solved. If Charles is listening, maybe he can remember
> what the solution was.
>
>
>
>
> > -Ling
> >
> >
> > > "Charles F." <charles@202.96.178.16> writes:
> > >
> > > > I am sure they are initialized to the same speed. Yesterday I tried
to
> > use
> > > > non-optimization setting (delete the -O2 switch in general build
> > settings)
> > > > to compile ecos and it works! I guess there is something wrong with
the
> > > > optimized serial port intialization code. I have experience porting
> > WinCE to
> > > > 4373 board and once I met this kind of problem too. Am I right?
> > >
> > >
> > > This raises one possibility:
> > >
> > > The HAL_DUART_WRITE_CR() macro contains a delay loop that is used to
> > > keep the Z8530 happy. It looks like with -O2 this loop maybe being
> > > eliminated or optimized so it is too short. However, exactly the same
> > > code appears in the initialization for the stubs, and GCC shouldn't
> > > eliminate such loops. So it is not at all clear what the difference
> > > here is.
> > >
> > > I have just compiled this code with -O2 and it seems to keep the delay
> > > loop intact. Maybe your board has a faster CPU? The code is currently
> > > set up for a 133MHz part. Try changing the value of ZDEL in
> > > plf_z8530.h to something greater (and compiling with -O2) and see if
> > > that makes a difference.
> > >
> > > --
> > > Nick Garnett, eCos Kernel Architect
> > > Red Hat, Cambridge, UK
> > >
> > >
> >
> >
> >
>
>
> --
> Nick Garnett, eCos Kernel Architect
> Red Hat, Cambridge, UK
>
>