Hi Peter, > * Check for a pullup on the GPIOA net. If it is missing, try adding one. > GPIOA net has pull-high 4.4Komh (3.3V). > * Run ./io r44c r44d r44e r44f > If the first byte has some bits unset, I misunderstood the byte order. > stress:/tmp # ./io r44c r44d r44e r44f r0x044c=ff r0x044d=ff r0x044e=ff r0x044f=ff Rgds, Vinod