Re: [Qemu-devel] [PATCH] debugcon: support for debugging consoles (e.g. Bochs port 0xe9)

[Gerd Hoffmann]

On 11/25/09 23:31, H. Peter Anvin wrote:
> On 11/25/2009 02:26 PM, H. Peter Anvin wrote:
> > As such, I think there is still a place for the simple command line
> > options like "-hda", "-serial" and my proposed "-debugcon", in addition
> > to the full-featured connect-anything options and configuration files.
> > That's all.
>
> I guess one question is if the simplified options could be better
> implemented via some kind of builtin macros or translation submodule
> rather than being treated as first-class options which they basically
> are now.  Still, that's a future development task.

Wouldn't be that hard I think.  Something along the lines of

    case QEMU_OPTION_debugcon:
         opts = qemu_chr_parse_compat("debugcon", optarg);
         if (NULL == opts) {
              fprintf(stderr, "already have a debugcon chardev\");
              exit(1);
         }
         opts = qemu_opts_create(&qemu_device_opts, "debugcon", 1);
         if (NULL == opts) {
              fprintf(stderr, "already have a debugcon device\");
              exit(1);
         }
         qemu_opt_set(opts, "driver", isa-debugcon);
         qemu_opt_set(opts, "chardev", "debugcon");
         break;

should do the trick.  Depends on the chardev fix mentioned in this 
thread too.  Allows to define a single device with the default port via 
shortcut.

I tend to not add new command line switches for every little new device. 
 For this one it might be reasonable nevertheless given the use cases.

cheers,
  Gerd