[syslinux] Dell Latitude E6410 and BIOS drive ordering

[Gene Cumm]

I'm posting as an FYI.

I was testing BIOS A04 with a UFD (USB Flash Drive) but it probably
applies to everything that looks like a USB hard drive.  My previous
statement was partially incorrect as I did find a scenario to the
contrary.

I tried with FDD then CD at the top of the list and tried with both
just disabled (without reordering first).  I tried with the SATA
controller in ATA, AHCI and RAID/IRRT mode.  I tried letting the
laptop autoboot to PXE with the order of the remaining items as PXE,
USB, HDD and PXE, HDD, USB.  I tried manually booting PXE in these
same two orders plus USB, PXE, HDD.  This is a total of 30 scenarios
that I tested.

I found that the HDD was assigned 0x80 only when in ATA or AHCI mode,
autobooting to PXE, with the FDD and CD boot enabled (4 scenarios).

-- 
-Gene