Idea for change to boot0

These two changes allow you to set PXE as the default MBR boot =
selection, which enables you to write a 'reboot to the network' script.  =
We've found it to be very useful.  What do people think?

Thanks,
Andrew

> Index: usr.sbin/boot0cfg/boot0cfg.c
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> --- usr.sbin/boot0cfg/boot0cfg.c	(revision 228359)
> +++ usr.sbin/boot0cfg/boot0cfg.c	(working copy)
> @@ -169,7 +169,7 @@
>             o_flag =3D 1;
>             break;
>         case 's':
> -            s_arg =3D argtoi(optarg, 1, 5, 's');
> +            s_arg =3D argtoi(optarg, 1, 6, 's');
>             break;
>         case 't':
>             t_arg =3D argtoi(optarg, 1, 0xffff, 't');
> @@ -472,6 +472,8 @@
>     printf("default_selection=3DF%d (", mbr[OFF_OPT] + 1);
>     if (mbr[OFF_OPT] < 4)
> 	printf("Slice %d", mbr[OFF_OPT] + 1);
> +    else if (mbr[OFF_OPT] =3D=3D 5)
> +        print("PXE");
>     else
> 	printf("Drive 1");
>     printf(")\n");
> Index: sys/boot/i386/boot0/boot0.S
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> --- sys/boot/i386/boot0/boot0.S	(revision 228359)
> +++ sys/boot/i386/boot0/boot0.S	(working copy)
> @@ -413,6 +413,7 @@
> 	3:
> #endif /* ONLY_F_KEYS */
> #endif /* SIO */
> +check_selection:
> 		cmpb $0x5,%al			# F1..F6 or 1..6 ?
> #ifdef PXE /* enable PXE/INT18 using F6 */
> 		jne 1f;
> @@ -421,7 +422,6 @@
> #endif /* PXE */
> 		jae beep			# Not in F1..F5, beep
>=20
> -check_selection:
> 	/*
> 	 * We have a selection.  If it's a bad selection go back to =
complain.
> 	 * The bits in MNUOPT were set when the options were printed.

--------------------------------------------------
Andrew Boyer	aboyer@averesystems.com

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