Single Board Computer Lock-up Booting VxWorks 5.4 After USB Enabled
In Embedded Systems Single Board Computer to enable USB functions in the BIOS settings, the board may not boot VxWorks 5.4 properly.
VxWorks version 5.4 doesn't have support for USB built in. Try to create your own USB driver. VxWorks version 5.5 and the later version 6.2 does support USB. If USB function is a requirement, it is recommended that you use one of these later VxWorks versions.