Clear cache after writes, not before

main.cpp

@@ -1980,7 +1980,6 @@ struct picoboot_memory_access : public memory_access {
     void write(uint32_t address, uint8_t *buffer, unsigned int size) override {
         vector<uint8_t> write_data; // used when erasing flash
         if (flash == get_memory_type(address, model)) {
-            clear_cache(); // clear entire flash cache on any write, to be safe
             connection.exit_xip();
             if (erase) {
                 // Do automatically erase flash, and make it aligned
@@ -2014,6 +2013,7 @@ struct picoboot_memory_access : public memory_access {
         }
         if (is_transfer_aligned(address, model) && is_transfer_aligned(address + size, model)) {
             connection.write(address, (uint8_t *) buffer, size);
+            clear_cache(); // clear entire flash cache after any write, to be safe
         } else {
             // for write, we must be correctly sized/aligned in 256 byte chunks
             std::stringstream sstream;