Le 2010-11-04 17:10, Andreas Fritiofson a écrit :
2010/10/31 Michel Catudal<michelcatu...@gmail.com>:
Le 2010-10-29 19:15, Andreas Fritiofson a écrit :
One can also ponder why you need debug access to something molded in
plastic... Wouldn't it be better to debug your application on a more
lab-friendly setup?
A production unit that is to be protected from the environment must be
molded into something.
We would never use plastic in most application but the end result would be
the same.
I do agree that molded in plastic is strange but what difference would it
make as for software is concerned?
It's not the plastic mold that's strange, it's the desire to _debug_
software on a production unit, permanently sealed or not. Debugging is
software development, which is more comfortably done on a lab unit
which can be probed and measured (and, in the best of worlds,
preferably _before_ production even starts).
You didn't think this one thru. There is debugging during development
but also during manufacturing.
Usually even when the package is sealed we leave connections for debugging.
What would you need to do if you have a recall of a product and you need
to figure out what is wrong with your software?
It is not always a hardware issue where you just swap units.
Even in the cases where you have to disable jtag for units shipped it is
nice to be able to debug with units almost identical to what is in the
field.
We only debug on prototypes before the production cycle. Once units are
in production prototypes cannot be used to debug. Also, the final debug
phase is always done on production units since we need to work with the
real stuff. If you need high security you need to disable jtag after all
your test. It would then be impossible to debug returned units but you
still have similar units where you could try to simulate the issues that
occured in the field.
If you'd ever worked for the military you would realize that you need to
have answers that the big brass will believe if you get a FUBAR or SNAFU.
Michel
Michel
--
Tired of Microsoft's rebootive multitasking?
then it's time to upgrade to Linux.
http://home.comcast.net/~mcatudal
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