cmd_boot
cmd_boot(2, args, false);
{ cmd_boot, 1, { "mem:", 0, 0, 0, 0, 0, 0 } },
{ cmd_boot, 1, { "sd0k:netbsd", 0, 0, 0, 0, 0, 0 } },
{ "boot", cmd_boot },
int cmd_boot(int, char **, int);