[SeaBIOS] [PATCH] Support multiple hard disks in boot list.

[Kevin O'Connor]

On Fri, Jun 30, 2017 at 08:48:27PM -0400, Gaurav Poothia wrote:
> If multiple disks in boot order and first is unbootable
> then fallback to other disks in list.
[...]
> @@ -731,7 +736,10 @@ do_boot(int seq_nr)
>          break;
>      case IPL_TYPE_HARDDISK:
>          printf("Booting from Hard Disk...\n");
> -        boot_disk(0x80, 1);
> +        if (ie->hdid == -1)
> +          boot_disk(0x80 , 1);
> +        else
> +          boot_disk(0x80 + ie->hdid, 1);
>          break;
>      case IPL_TYPE_CDROM:
>          boot_cdrom((void*)ie->vector);

Ultimately, what this patch does is set the DL register to something
other than 0x80.  I tested this approach a few years ago, and at the
time I could not find a single bootloader that used DL.  What
bootloaders did you test with this, and which ones worked and did not
work?

-Kevin