> On 23 April 2012 23:21, Peter Chubb <peter.ch...@nicta.com.au> wrote: > > Peter> Are these two devices really on the same IRQ? > > > > Yes. A single interrupt line comes from the FPGA into the AVIC. > > Inside the FPGA the interrupts for the UARTs, SD card and NAND flash > > are connected to that single interrupt line. > > The non-touchscreen FPGA UART isn't mentioned in the KZM manual, but > > is available on the board as a debug port. > > > > To avoid confusion I think I'll just get rid of it. > > Up to you. A comment would be fine if you'd rather keep the device.
No it's not. You must never connect multiple devices to the same IRQ. You need an explicit mux in between. Paul
