MVME5100 Single Board Computer Installation and Use - Bustec

PPCBug Firmware3For example, if a breakpoint has been specified, then control returns to thedebugger when the breakpoint is encountered during execution of the userprogram. Alternately, the user program could return to the debugger bymeans of the System Call Handler routine RETURN (described in thePPCBug Firmware Package User’s Manual). For more about this, refer tothe GD, GO, and GT command descriptions in the PPCBug FirmwarePackage User’s Manual, listed in Appendix D, Related Documentation.A debugger command is made up of the following parts:❏❏❏❏The command name, either uppercase or lowercase (for example,MD or md)Any required arguments, as specified by commandAt least one space before the first argument. Precede all otherarguments with either a space or comma.One or more options. Precede an option or a string of options witha semicolon (;). If no option is entered, the command’s defaultoption conditions are used.Hardware and Firmware InitializationThe debugger performs the hardware and firmware initialization process.This process occurs each time the MVME5100 is reset or powered up. Thesteps listed below are a high-level outline; be aware that not all of thedetailed steps are listed.1. Sets MPU.MSR to known value.2. Invalidates the MPU's data/instruction caches.3. Clears all segment registers of the MPU.4. Clears all block address translation registers of the MPU.5. Initializes the MPU-bus-to-PCI-bus bridge device.6. Initializes the PCI-bus-to-ISA-bus bridge device.7. Calculates the external bus clock speed of the MPU.3-4 Computer Group Literature Center Web Site