[syslinux] memdisk fails with 4 hdds

[Knut Petersen]

Hi everybody.

Hardware: Several computers with

  Asus P/I-P55t2P4S motherboard,
  CPU Pentium MMX and K6-2/3,
  128 to 384 MB RAM,
  Award 4.51PG Bios,
  Hard disks from 8 GB to 123.5 GB
  Realtek 8139D based NICs with PXE Boot-Proms

PXELINUX 2.06 / MEMDISK 2.06:
   - fails to boot Compaq PC-DOS 3.31

PXELINUX 2.08
   - succeeds to boot Compaq PC-DOS 3.31 with 0, 1, 2 and 3 hdds 
installed in system
   - fails to boot the same disk image with 4 hdds installed in system. 
Computer locks
     up completly after "Loading boot sector ... booting ...", cursor at 
beginning of next
     line.

There is no difference on the values displayed before success or lockup ...

Old dos memory at 0x9fc00 (map says 0xa0000), loading at 0x9f400
1588:  0xffff 15e801 0x3c000 0xee7
Int 1308 Success, count=0, BPT = 0000:0000
old: int 13 = f000b6ac int15=f000f859
new: int 13 = 9f400008 int15 =9f400272
loading boot sector ... booting ...
_<=cursor blinking here, lockup or success

Any ideas?
cu,
 Knut Petersen