Re: [ECOS] redboot and MIPS malta board

[Jonathan Larmour <jifl at eCosCentric dot com>]

Jimmy Zhang wrote:
> ----- Original Message -----
> From: "Jonathan Larmour" <jifl@eCosCentric.com>
> To: <jzhang@elmic.com>
> Cc: <ecos-discuss@sources.redhat.com>
> Sent: Monday, November 04, 2002 7:58 PM
> Subject: Re: [ECOS] redboot and MIPS malta board
>
>
>
> >   Zhang wrote:
> > > Dear all, here is my problem:
> > >
> > > Firstly I am able to download the prebuild
> > > ECOSDIR/images/mips/malta/redboot_ROM.fl to my malta board, it worked,
> > > but just for a few minutes. Then I can't download it any more. It
> > > always gives me some wierd charactors, and all eight D28 LEDs are
> > > green.
> > >
> > > I tried to rebuild, ( using the import configure file
> > > .../misc/redboot_ROM.ecm, and srecconv.pl -ES L -A 29 to convert),
> > > still, I can't download the result redboot.fl, and all D28 LEDs are
> > > green again. (but no weird charactors this time)
> > >
> > > I remembered that I typed (SHIFT + 4) when redboot was working on my
> > > malta board. It is very strange that whenever I typed that, my malta
> > > board is dead and I have to reset it. After several times, the
> > > resetting is not working for me any more, and I even can't download any
> > > more.
> > >
> > > Anybody gives some hint about this?
> >
> > Shift 4 is '$' and makes RedBoot switch into GDB debugging mode which as
> > far as _you_ can tell well make it appear dead. You need to do a power
> > cycle or full reset. Alternatively you can try typing:
> >
> > ++$k#6b
> > followed by return to ensure the line is flushed. That should resuscitate
> > the redboot prompt.
> >
> > Jifl
>
> Hi, Jonathan,
>
> Thanks for your information! I intended to go to GDB mode by typing "SHIFT
> 4",
You do know you don't have to do this yourself, right? This happens 
automatically when you connect from GDB as the first thing GDB sends is a '$'.

> however, there is no message on the screen to show me that I have
> already entered GDB stub mode. (I think eCos should generate that
> information...sign...)
That would be nice, but for practical reasons we can't. If this is GDB, 
GDB needs a quick reply or it will time out, so we can't output anything.

> so I happended to type it several times

Hmm. odd.

> I turned off all the power source, reset hundreds of times, downloadded all
> sorts of redboot image, just the same thing. Anyway, whenever I downloaded
> the Yamon image to my malta board, it works fine.
Okay, this particular issue definitely shouldn't be persistent over a 
power cycle! Sorry I can't help more.

Jifl
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