From owner-freebsd-bugs  Fri Apr  6 15:20:10 2001
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Date: Fri, 6 Apr 2001 15:20:03 -0700 (PDT)
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From: Doug Ambrisko <ambrisko@whistle.com>
Subject: Re: i386/26382: FreeBSD Bootable CDROM won't boot on IBM PC Desktops
Reply-To: Doug Ambrisko <ambrisko@whistle.com>
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The following reply was made to PR i386/26382; it has been noted by GNATS.

From: Doug Ambrisko <ambrisko@whistle.com>
To: freebsd-gnats-submit@FreeBSD.org, ambrisko@whistle.com
Cc:  
Subject: Re: i386/26382: FreeBSD Bootable CDROM won't boot on IBM PC Desktops
Date: Fri, 06 Apr 2001 15:00:55 -0700

 Here is the updated structure in boot1.s to fix FreeBSD CDROM booting on
 ThinkPads 770Z, 600E.
 
   /*  From OpenBSD biosboot.S with tuned values from Doug Ambrisko so
       ThinkPads can boot from CDROM.  I think the critical part
       is setting the media type.
   */
           .org 0x03, 0x00
           .asciz  "FreeBSD"
           /* BPB */
           .org 0x0b, 0x00
   bpb:    .word   512             /* sector size */
           .byte   1               /* sectors/cluster */
           .word   1               /* reserved sectors */
           .byte   2               /* # of FAT */
           .word   224             /* root entries */
           .word   2880            /* small sectors */
           .byte   0xf0            /* media type (fd) */
           .word   144             /* sectors/fat */
           .word   18              /* sectors per track */
           .word   2               /* # of heads */
 
           /* EBPB */
           .org 0x1c, 0x00
   ebpb:   .long   16              /* hidden sectors */
           .long   0               /* large sectors */
 
 

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