[syslinux] isolinux issue with AOpen DVD writer

[nospam27 at bnichols.org]

I'm having a problem booting Slackware 10.1 boot CD's as well as an
isolinux image of my own.  The system is a VIA Epia M10000 and the drive
is an AOpen ISU-8424E CD/DVD writer.  If I use a Toshiba CD-RW/DVD-ROM
Drive SD-R2612 in place of the AOpen DVD writer, the cd boots fine and
everything works as expected.

What's the best course for further debugging of this problem?  The only
thing I notice is the number of sectors shown in debugging output is 5,
while the argument to mkisofs specifies 4 (apparently it's a problem for
some BIOS's if the number of sectors is not a multiple of 4, from what
I've read in the Slackware documentation).  I tried 20 and 22 for the
-boot-load-size argument to mkisofs with the exact same results.  The
isolinux-debug.bin file is 11100 bytes long, which tells me it's either 6
sectors of size 2048, or 22 sectors of size 512. . .  However, it seems
the thing should just work, since it does for the other CD drive.

Here's the isolinux debugging output:

ISOLINUX 3.09 2005-06-17 Copyright (C) 1994-2005 H. Peter Anvin
isolinux: Starting up, DL = 9F
isolinux: Loaded spec packet OK, drive = 9F
isolinux: Loading main image from LBA = 00000024
isolinux: Sectors to load = 0005
isolinux: Loaded boot image, verifying...
isolinux: Image checksum error, sorry...

Boot failed: press a key to retry


Thanks in advance for any help,

bryce