private void createBufferSubBlock(byte initialValue, long blockOffset, int size)
			throws IOException {
		DBBuffer buffer = adapter.createBuffer(size, initialValue);
		DBRecord subBlockRecord = adapter.createSubBlockRecord(id, blockOffset, size,
			MemoryMapDBAdapter.SUB_TYPE_BUFFER, buffer.getId(), 0);

		BufferSubMemoryBlock sub = new BufferSubMemoryBlock(adapter, subBlockRecord);
		subBlocks.add(sub);
	}
Get collection of blocks which map onto this block.

@return collection of blocks which map onto this block or null if none identified
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/mem/MemoryBlockDB.java