> 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.
>
> [r...@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)
> [r...@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
>
>
>
>
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