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

[Kevin O'Connor]

On Thu, Jul 13, 2017 at 05:30:43PM -0700, Gaurav Poothia wrote:
> Hi Kevin,
> I also tried this patch to fallback from non bootable SCSI disk to
> bootable SCSI disk with Windows installed. That worked too.
> So while we cannot see the Windows bootloader source it sure seems to
> be honoring the DL values other than 0x80

Thanks.  I tried a handful of images I had handy and found a bunch of
failures (see testing patch I used below).

lilo - failed
freedos - failed subtly
winxp - failed
winvista - success
fedora 13 disk - failed

Unfortunately, I don't think this is a change that could be made
without near universal support.  As, when it does fail, it fails in a
very cryptic way.  I think it would be more pain for users than gain.

-Kevin

--- a/src/boot.c
+++ b/src/boot.c
@@ -731,7 +731,7 @@ do_boot(int seq_nr)
         break;
     case IPL_TYPE_HARDDISK:
         printf("Booting from Hard Disk...\n");
-        boot_disk(0x80, 1);
+        boot_disk(0x81, 1);
         break;
     case IPL_TYPE_CDROM:
         boot_cdrom((void*)ie->vector);