On Wed, 2013-02-27 at 22:01 +0100, Matthias Trute wrote: > Mikael, > > >> >From checking your code, I can imagine a few things that would break > >> FF as well. ;) > > I am interested to know what that could be. > > In flashforth.asm I found the following lines > > rcall DOLIT > .dw dp_start > rcall FETCH > rcall TRUE_ > call EQUAL > call ZEROSENSE > breq WARM_3 > rcall EMPTY > WARM_3: > > I read them as "if dp_start is -1, call EMPTY, otherwise > skip to WARM_3". This checks if the EEPROM got erased. Fine > so far (a common error if you forgot to flash the eeprom > hex file). But what if dp_start is something else?
The idea here is that the default eeprom contents is copied from flash. The eeprom file contains just $FFFF for the turnkey to make sure that this copy happens. > > I did not analyze (or even tested) this, but an invalid > turnkey action (e.g. assigning not an XT to turnkey) may be > sufficient (dp_start seems to be the turnkey vector). Than > you have no chance to recover the system automatically. (or > you have some more lines of defence...) If the turnkey vector is crashing the system, sooner or later the system will restart (ctrl-o). The turnkey can then be disabled by sending ESC to the serial port during the two first seconds of the startup. Then you can give manually the EMPTY command to recover. Automatic recovery was never the goal, just to have the possibility to interrupt the system and set it to an initial state. This is just makes working so much easier when you don't need to reflash the chip. > > > I guess it can break but remarkably seldom. > > Well, seldom is a relative number ;) > > You check for errors, that already happened or are > possible. Its the same with security: You can do a lot > of things but someone will break in nevertheless. That > doesn't make your work bad, absolutly not!! I'm the one > who is lazy and ignorant I put all the burden to the > user ;) You are following the Forth philosophy, the user is in full control. mfg Mikael ------------------------------------------------------------------------------ Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_d2d_feb _______________________________________________ Amforth-devel mailing list for http://amforth.sf.net/ Amforth-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/amforth-devel
