Dear Jens,
In message <[EMAIL PROTECTED]> you wrote:
>
> > Normally the console I/O routines will trigger the watchdog while
> > waiting for characters to arrive or to be sent. Obviously you missed
> > to add such code.
>
> On 2008-09-14 in "Re: [U-Boot] Watchdog support." you wrote to Luigi, that
> this souldn't be necessary.
I see. Indeed I wasn;t really clear about that, there. I was ignoring
the first part of the question and just replying the the second half
("lot of commands (copy in flash, tftp, ...)") - that's what I meant
when I wrote " the common infeastructure should work just fine."
> Why couldn't it be in the main loop of U-Boot?
Because it wouldn't work. When you are waiting for input, you are
usually blocking in a getc() which waits for some status bit to be
set that will indicate that the next character was received. You will
have to trigger the watchdog in this polling loop.
> It seems, PPC uses real interrupts. Up to now I thought U-Boot doesn't
> handle interrupts at all.
U-Boot usually doesn't use them, but they are avaiable and can be
used where it makes sense. It's just that usually it doesn;t make
sense - it only adds complexity to the code without advantages, so we
tend to avoid it.
Best regards,
Wolfgang Denk
--
DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: [EMAIL PROTECTED]
This cultural mystique surrounding the biological function -- you
realize humans are overly preoccupied with the subject.
-- Kelinda the Kelvan, "By Any Other Name", stardate 4658.9
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