Hi Sergei, Another query: > Ah, I forgot to mention that if your UART is a part of the south bridge, > its IRQ number is _4_ on the integrated 8259 interrupt controller. I'm sure > that AU1000_GPIO_0 is the cascaded interrupt request from 8259, not the UART's > own IRQ... > > >>static struct plat_serial8250_port encm3_via_uart_data[] = { > >> { > >> .mapbase = 0x3f8, > >> .irq = AU1000_GPIO_0, > > So, this is wrong. You need to specify to what platform IRQ 8259's IRQ4 > gets routed here. I m not sure what you mean here -- the AU1000_GPIO_0 is the cascaded interrupt request from the 8259 on the VIA Southbridge -- Best Regards, Ashlesha.