Editing Diagnostic Serial Console (section)

=== Memory Boundary Testing Sequence ===

To systematically test memory boundaries and address decode logic:

<pre>
*L00000000    ; Set address to start of memory
*B00000004    ; Set 4-byte operation
*D12345678    ; Write test pattern
*L00000000    ; Reset to start address
*M            ; Read back pattern (should return 12345678)

*L00100000    ; Test 1MB boundary
*B00000004
*DDEADBEEF    ; Write different pattern
*L00100000
*M            ; Read back (should return DEADBEEF)

*L00400000    ; Test 4MB boundary (may fail on 4MB systems)
*B00000004
*DCAFEBABE
*L00400000
*M            ; May return error or wrap to beginning
</pre>

This sequence systematically tests address decode functionality and identifies the exact point where address wrapping or failures occur, providing precise information about memory controller limitations and installed memory boundaries.