Hello, until now in TC1798 we use the first flash (PMU0) with header and footer and CRC-building. In TC1798 there is a gap between PMU0 and PMU1. Problem: now we want use also the PMU1 (but not always), so we don't know whether PMU1 is used and so we don't know footer / header for CRC-Building exactly? The main point is: what would you suggest how we could handle the reserved parts? Would it be better to - build two checksums over each part? - build a checksum within the reserved parts? ( I don't think so ....) - build a checksum and left out the reserved parts (but how). I would be glad if anyone could help me. Regards Matthias