From: Lanttor <lanttor.guo@freescale.com>
To: linux-m68k@vger.kernel.org
Subject: uart issues on coldfire platform
Date: Wed, 01 Jul 2009 10:20:48 +0800 [thread overview]
Message-ID: <4A4AC800.3070901@freescale.com> (raw)
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
next reply other threads:[~2009-07-01 2:20 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-01 2:20 Lanttor [this message]
2009-07-01 6:30 ` uart issues on coldfire platform Lanttor
2009-07-02 0:40 ` [uClinux-dev] " Greg Ungerer
2009-07-02 2:21 ` Lanttor
2009-07-01 13:44 ` Matthew Lear
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