This chapter describes the OS specific parts of OTP which relate to the VME Bus Driver.

## Installation Problems

The hardware watchdog timer which is controlled by the heart port program requires the FORCEvme package, which contains the VME bus driver, to be installed. This driver, however, might clash with the Sun mcp driver and cause the system to completely refuse to boot. To cure this problem, the following lines should be added to /etc/system:

exclude: drv/mcp exclude: drv/mcpzsa exclude: drv/mcpp

It is recommended that these lines be added to avoid the clash described, which may make it completely impossible to boot the system.