On PPC4xx embedded we often have UART0 on IRQ0 but 8250 UART driver uses IRQ0 as "no irq" hack. It's suggested that platforms with UART on IRQ0 will redefine is_real_interrupt(irq) macro but 8250 code anyway overrides that. As the result, serial line on UART0 works on polling-way and we have character loss on high baud rates.
In patch I added check if UART0 is on IRQ0, if so we define is_real_interrupt macro to be 1 (true). Also, check if is_real_interrupt macro is already defined added to 8250 UART driver. ------------------------------------------------------------------- --- linux.orig/include/asm-ppc/ibm4xx.h 2007-03-23 21:52:51.000000000 +0200 +++ linux/include/asm-ppc/ibm4xx.h 2007-04-06 17:37:22.000000000 +0300 @@ -54,6 +54,12 @@ #include <platforms/4xx/xilinx_ml403.h> #endif +#ifdef UART0_INT +#if (UART0_INT == 0) +#define is_real_interrupt(irq) (1) +#endif +#endif + #ifndef __ASSEMBLY__ #ifdef CONFIG_40x --- linux.orig/drivers/serial/8250.c 2007-03-23 21:52:51.000000000 +0200 +++ linux/drivers/serial/8250.c 2007-04-06 16:44:32.000000000 +0300 @@ -77,7 +77,9 @@ * machine types want others as well - they're free * to redefine this in their header file. */ +#ifndef is_real_interrupt(irq) #define is_real_interrupt(irq) ((irq) != 0) +#endif #ifdef CONFIG_SERIAL_8250_DETECT_IRQ #define CONFIG_SERIAL_DETECT_IRQ 1 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
