* main.c: Remember whether the device initialization worked, and

allow to continue with -F if it failed yet do not attempt to
perform anything on the device itself.  That way, -tF could be
specified for programmers like the STK500/STK600 even without a
device connected, just in order to allow changing parameters on
the programmer itself.
* avrdude.1: Document that possible use of the -F option.
* doc/avrdude.texi: (Ditto.)


git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk/avrdude@779 81a1dc3b-b13d-400b-aceb-764788c761c2

ChangeLog

@@ -1,3 +1,14 @@
+2008-07-29  Joerg Wunsch <j.gnu@uriah.heep.sax.de>
+
+	* main.c: Remember whether the device initialization worked, and
+	allow to continue with -F if it failed yet do not attempt to
+	perform anything on the device itself.  That way, -tF could be
+	specified for programmers like the STK500/STK600 even without a
+	device connected, just in order to allow changing parameters on
+	the programmer itself.
+	* avrdude.1: Document that possible use of the -F option.
+	* doc/avrdude.texi: (Ditto.)
+
 2008-07-29  Joerg Wunsch <j.gnu@uriah.heep.sax.de>
 
 	* stk500v2.c (stk600_xprog_paged_write): Fix a fatal miscalculation

NEWS

@@ -28,6 +28,10 @@ Current:
   * Add support for ATxmega128A1 (including the revision D engineering
     samples) for STK600 tools using PDI
 
+  * The option combination -tF now enters terminal mode even if the
+    device initialization failed, so the user can modify programmer
+    parameters (like Vtarget).
+
 Version 5.5:
 
   * Add support for the USBtinyISP programmer (patch #6233)

avrdude.1

@@ -367,6 +367,12 @@ reasonable before continuing.  Since it can happen from time to time
 that a device has a broken (erased or overwritten) device signature
 but is otherwise operating normally, this options is provided to
 override the check.
+Also, for programmers like the Atmel STK500 and STK600 which can
+adjust parameters local to the programming tool (independent of an
+actual connection to a target controller), this option can be used
+together with
+.Fl t
+to continue in terminal mode.
 .It Fl i Ar delay
 For bitbang-type programmers, delay for approximately
 .Ar delay

doc/avrdude.texi

@@ -563,6 +563,10 @@ the part is reasonable before continuing.  Since it can happen from time
 to time that a device has a broken (erased or overwritten) device
 signature but is otherwise operating normally, this options is provided
 to override the check.
+Also, for programmers like the Atmel STK500 and STK600 which can
+adjust parameters local to the programming tool (independent of an
+actual connection to a target controller), this option can be used
+together with @option{-t} to continue in terminal mode.
 
 @item -i @var{delay}
 For bitbang-type programmers, delay for approximately

main.c

@@ -279,6 +279,7 @@ int main(int argc, char * argv [])
   int     ispdelay;    /* Specify the delay for ISP clock */
   int     safemode;    /* Enable safemode, 1=safemode on, 0=normal */
   int     silentsafe;  /* Don't ask about fuses, 1=silent, 0=normal */
+  int     init_ok;     /* Device initialization worked well */
   unsigned char safemode_lfuse = 0xff;
   unsigned char safemode_hfuse = 0xff;
   unsigned char safemode_efuse = 0xff;
@@ -823,8 +824,8 @@ int main(int argc, char * argv [])
   /*
    * initialize the chip in preperation for accepting commands
    */
-  rc = pgm->initialize(pgm, p);
-  if (rc < 0) {
+  init_ok = (rc = pgm->initialize(pgm, p)) >= 0;
+  if (!init_ok) {
     fprintf(stderr, "%s: initialization failed, rc=%d\n", progname, rc);
     if (!ovsigck) {
       fprintf(stderr, "%sDouble check connections and try again, "
@@ -851,12 +852,14 @@ int main(int argc, char * argv [])
    * against 0xffffff / 0x000000 should ensure that the signature bytes
    * are valid.
    */
-  rc = avr_signature(pgm, p);
-  if (rc != 0) {
-    fprintf(stderr, "%s: error reading signature data, rc=%d\n",
-            progname, rc);
-    exitrc = 1;
-    goto main_exit;
+  if (init_ok) {
+    rc = avr_signature(pgm, p);
+    if (rc != 0) {
+      fprintf(stderr, "%s: error reading signature data, rc=%d\n",
+	      progname, rc);
+      exitrc = 1;
+      goto main_exit;
+    }
   }
 
   sig = avr_locate_mem(p, "signature");
@@ -917,7 +920,7 @@ int main(int argc, char * argv [])
     }
   }
 
-  if (safemode == 1) {
+  if (init_ok && safemode == 1) {
     /* If safemode is enabled, go ahead and read the current low, high,
        and extended fuse bytes as needed */
 
@@ -989,7 +992,8 @@ int main(int argc, char * argv [])
    *
    * The cycle count will be displayed anytime it will be changed later.
    */
-  if ((set_cycles == -1) && ((erase == 0) || (do_cycles == 0))) {
+  if (init_ok &&
+      (set_cycles == -1) && ((erase == 0) || (do_cycles == 0))) {
     /*
      * see if the cycle count in the last four bytes of eeprom seems
      * reasonable
@@ -1005,7 +1009,7 @@ int main(int argc, char * argv [])
     }
   }
 
-  if (set_cycles != -1) {
+  if (init_ok && set_cycles != -1) {
     rc = avr_get_cycle_count(pgm, p, &cycles);
     if (rc == 0) {
       /*
@@ -1028,7 +1032,7 @@ int main(int argc, char * argv [])
   }
 
 
-  if (erase) {
+  if (init_ok && erase) {
     /*
      * erase the chip's flash and eeprom memories, this is required
      * before the chip can accept new programming
@@ -1043,10 +1047,18 @@ int main(int argc, char * argv [])
   if (terminal) {
     /*
      * terminal mode
-     */         
+     */
     exitrc = terminal_mode(pgm, p);
   }
 
+  if (!init_ok) {
+    /*
+     * If we came here by the -tF options, bail out now.
+     */
+    exitrc = 1;
+    goto main_exit;
+  }
+
 
   for (ln=lfirst(updates); ln; ln=lnext(ln)) {
     upd = ldata(ln);