LOONGSON_UART_IRQ   12 arch/mips/include/asm/mach-loongson64/irq.h #define LOONGSON_UART_IRQ   (MIPS_CPU_IRQ_BASE + 2) /* UART */
LOONGSON_UART_IRQ   20 arch/mips/loongson64/lemote-2f/irq.c #define LOONGSON_UART_IRQ	(MIPS_CPU_IRQ_BASE + 3) /* cpu serial port */