Motorola MVME187 manual Booting and Restarting 187Bug, Memory Requirements

Models: MVME187

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Memory Requirements

Booting and Restarting 187Bug

Memory Requirements

The program portion of 187Bug is approximately 512KB of code, consisting of download, debugger, and diagnostic packages and contained entirely in EPROM. The EPROM sockets on the MVME187 are mapped starting at location $FF800000.

187Bug requires a minimum of 64KB of contiguous read/write memory to operate.

The ENV command controls where this block of memory is located. Regardless of where the onboard RAM is located, the first 64KB is used for 187Bug stack and static variable space and the rest is reserved as user space.

Whenever the MVME187 is reset, the target IP is initialized to the address corresponding to the beginning of the user space, and the target stack pointers are initialized to addresses within the user space, with the target Pseudo Stack Pointer (R31) set to the top of the user space.

At power up or reset, all 8KB of memory at addresses $FFE0C000 through $FFE0DFFF is completely changed by the 187Bug initial stack.

Booting and Restarting 187Bug

This section covers the following tasks:

Starting up 187Bug

Autoboot

ROMboot

Network boot

Restarting the system

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Motorola MVME187 manual Booting and Restarting 187Bug, Memory Requirements