Hi, I find one issue of UART on my coldfire platforms (mcf54451evb board). I use the linux-2.6.29, and use drivers/serial/mcf.c and drivers/serial/serial_core.c as my uart driver source. Following is my test steps -- run command: cat /proc/interrupts two times contiguously. [root@freescale /]# cat /proc/interrupts M5445X *90: 5099 UART* M5445X 96: 3130 timer0 M5445X 99: 0 timer3 M5445X 100: 1569 fec(TXF) M5445X 101: 0 fec(TXB) M5445X 102: 0 fec(TXFIFO) M5445X 103: 0 fec(TXCR) M5445X 104: 3098 fec(RXF) M5445X 105: 0 fec(RXB) M5445X 106: 41 fec(MII) M5445X 107: 0 fec(LC) M5445X 108: 0 fec(HBERR) M5445X 109: 0 fec(GRA) M5445X 110: 0 fec(EBERR) M5445X 111: 0 fec(BABT) M5445X 112: 0 fec(BABR) [root@freescale /]# cat /proc/interrupts M5445X *90: 5714 UART* M5445X 96: 3700 timer0 M5445X 99: 1 timer3 M5445X 100: 1574 fec(TXF) M5445X 101: 0 fec(TXB) M5445X 102: 0 fec(TXFIFO) M5445X 103: 0 fec(TXCR) M5445X 104: 3108 fec(RXF) M5445X 105: 0 fec(RXB) M5445X 106: 47 fec(MII) M5445X 107: 0 fec(LC) M5445X 108: 0 fec(HBERR) M5445X 109: 0 fec(GRA) M5445X 110: 0 fec(EBERR) M5445X 111: 0 fec(BABT) M5445X 112: 0 fec(BABR) I find that the interrupts for above operation is 5714 - 5099 = 605 Is it normal? (my opinion it's too much) I test it on the mcf5329 board, it has the same-like result (even more 605). Actually I don't modify any code of mcf.c and serial_core.c, but I don't know why so much interrupts are occurred through one operation? Regards, Lanttor -- To unsubscribe from this list: send the line "unsubscribe linux-m68k" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
