[syslinux] Chainload Bootloader

[Eddy]

Hi,

I have two disks in my computer with each one,  a bootloader.
The first disk (a usb key) boot with syslinux bootloader that launches a
tiny kernel.
The second disk has grub 2.
I need to boot the disk 2 with grub, from the tiny kernel of the disk 1.
So i use the bios interruption 0x19 to load the second bootloader, but this
solution doesn't works.
If i use a  my own bootloader, the solution with the int 0x19 works fine.
May-be syslinux modifies something in the processor or the memory that
prevents to use the int 0x19 ?

 Best regards,
Eddy