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Re: Fw: diag serial port and debug serial port conflict?
- To: "Ling Su" <lingsu at palmmicro dot com>
- Subject: [ECOS] Re: Fw: [ECOS] diag serial port and debug serial port conflict?
- From: Nick Garnett <nickg at cygnus dot co dot uk>
- Date: 30 Aug 2000 18:21:25 +0100
- Cc: <ecos-discuss at sources dot redhat dot com>
- References: <008a01c012a4$88abf080$0201a8c0@raccoon>
"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