HELP building QNX image for Assabet (SA1110)

I’m trying to build an image of QNX RTOS 6.1 for the Intel StrongARM
platform (Assabet) following the “Running the QNX RTOS on Intel StrongARM
SA-1110/SA-1111 Development Platform” document (3901QNXSA.pdf). After the
image is built (by calling mkifs) I’m asked to invoke the “BL” utility to
add the header information to the image in order to be read by the
Telematics Bootloader (yes, I’m using this bootloader). The problem is that
I can’t find this utility anywhere…

Can anyone help me?
Many thanks,