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| >Adding A New Target</H1 |
| ><P |
| >DejaGnu has some additional requirements for target support, beyond |
| the general-purpose provisions of configure. DejaGnu must actively |
| communicate with the target, rather than simply generating or managing |
| code for the target architecture. Therefore, each tool requires an |
| initialization module for each target. For new targets, you must supply |
| a few Tcl procedures to adapt DejaGnu to the target. This permits |
| DejaGnu itself to remain target independent.</P |
| ><P |
| >Usually the best way to write a new initialization module is to |
| edit an existing initialization module; some trial and error will be |
| required. If necessary, you can use the @samp{--debug} option to see what |
| is really going on.</P |
| ><P |
| >When you code an initialization module, be generous in printing |
| information controlled by the <TT |
| CLASS="FUNCTION" |
| >verbose</TT |
| > |
| procedure.</P |
| ><P |
| >For cross targets, most of the work is in getting the |
| communications right. Communications code (for several situations |
| involving IP networks or serial lines) is available in a DejaGnu library |
| file.</P |
| ><P |
| >If you suspect a communication problem, try running the connection |
| interactively from <SPAN |
| CLASS="PRODUCTNAME" |
| >Expect</SPAN |
| >. (There are three |
| ways of running <SPAN |
| CLASS="PRODUCTNAME" |
| >Expect</SPAN |
| > as an interactive |
| interpreter. You can run <SPAN |
| CLASS="PRODUCTNAME" |
| >Expect</SPAN |
| > with no |
| arguments, and control it completely interactively; or you can use |
| <B |
| CLASS="COMMAND" |
| >expect -i</B |
| > together with other command-line options and |
| arguments; or you can run the command <B |
| CLASS="COMMAND" |
| >interpreter</B |
| > from |
| any <SPAN |
| CLASS="PRODUCTNAME" |
| >Expect</SPAN |
| > procedure. Use |
| <B |
| CLASS="COMMAND" |
| >return</B |
| > to get back to the calling procedure (if any), |
| or <B |
| CLASS="COMMAND" |
| >return -tcl</B |
| > to make the calling procedure itself |
| return to its caller; use <B |
| CLASS="COMMAND" |
| >exi</B |
| >t or end-of-file to leave |
| Expect altogether.) Run the program whose name is recorded in |
| <SPAN |
| CLASS="SYMBOL" |
| >$connectmode</SPAN |
| >, with the arguments in |
| <SPAN |
| CLASS="SYMBOL" |
| >$targetname</SPAN |
| >, to establish a connection. You should at |
| least be able to get a prompt from any target that is physically |
| connected.</P |
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