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Got trap No.23 when booting mips32 ?

To: linux-mips@linux-mips.org
Subject: Got trap No.23 when booting mips32 ?
From: "wilbur.chan" <wilbur512@gmail.com>
Date: Wed, 21 Oct 2009 22:40:32 +0800
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Hi all,


I've got some problem when booting mips32.


I got a No.23 trap when calling start_kernel --->  local_irq_enable :


irq 23, desc: 802a98a0, depth: 1, count: 0, unhandled: 0
->handle_irq():  80148c6c, handle_bad_irq+0x0/0x2b4
->chip(): 8029f738, 0x8029f738
->action(): 00000000
  IRQ_DISABLED set
unexpected IRQ # 23


No.23 trap is a Watch trap, which means that, when

"Physical address of load/store matched enabled value in


WatchLo/ WatahHi registers." happened, a No.23 trap was triggered by cpu.


So I used macro

__u32 watch_regh0= read_c0_watchhi0();
__u32 watch_regl0= read_c0_watchlo0();

to retrieve value from WatchHi and WatchLo,found them 0x1 and 0x0
respectively,which mean that ,

'r' together with  'w' bits were set to zero and no trap should be triggered.


But now , I got a 23 trap, why ?


At last , I used  to set WatchHi to 0x0, but failed , found it  still 0x1 after

calling write_c0_watchhi0(0)


Any suggestion would be grateful.

regards

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