- Improves error handling upon GDB connect

- switch to synchronous halt during connect. This fixes the bug
  where poll() was not invoked between halt() and servicing the
  'g' register packet
- halt() no longer returns error code when target is already halted, just
  logs a warning. Only the halt() implementation can say anything
  meaningful about why a halt() failed, so error messages are pushed
  up to halt()
- fixed soft_reset_halt infinite loop bug in arm7_9_common.c. The rest
  of the implementations are still busted.
- by using USER() instead of command_print() the log gets the 
  source + line #. Nice.
- no longer invoke exit() if soft_reset_halt fails. A reset can often 
  fix the problem.

git-svn-id: svn://svn.berlios.de/openocd/trunk@475 b42882b7-edfa-0310-969c-e2dbd0fdcd60

src/target/arm926ejs.c

@@ -578,10 +578,7 @@ int arm926ejs_soft_reset_halt(struct target_s *target)
 	arm926ejs_common_t *arm926ejs = arm9tdmi->arch_info;
 	reg_t *dbg_stat = &arm7_9->eice_cache->reg_list[EICE_DBG_STAT];
 	
-	if (target->state == TARGET_RUNNING)
-	{
-		target->type->halt(target);
-	}
+	target->type->halt(target);
 	
 	while (buf_get_u32(dbg_stat->value, EICE_DBG_STATUS_DBGACK, 1) == 0)
 	{