loadtools/scripts: gtm900.config renamed to gen4.config It turns out that a GTM900 variant exists with 8 MiB flash, thus -h gen8 needs to be used for GTM900 modules as the general case, and the old -h gtm900 config is best renamed to -h gen4, although not currently official for any actual target.

main()
{
	printf("Hello-world demo app (fixed UART version) running\n");
	for (;;) {
		putchar('=');
		if (command_entry())
			command_dispatch();
	}
}