[#4328] MPU crashes under stress

Submitted By: Mike Frysinger

Open Date

2008-08-08 17:36:37 Close Date

2008-08-28 17:50:38

Priority:

Medium Assignee:

Bernd Schmidt

Status:

Closed Fixed In Release:

N/A

Found In Release:

N/A Release:

2008R1

Category:

N/A Board:

N/A

Processor:

N/A Silicon Revision:

Is this bug repeatable?:

Yes Resolution:

Fixed

Uboot version or rev.:

Toolchain version or rev.:

App binary format:

N/A

Summary: MPU crashes under stress

Details:

observed on branch and trunk (which currently has same MPU code, so shouldnt be a big deal). but we're testing on 2008R1 branch as to avoid the 2.6.26 upgrade noise.

a customer reported under IRQ stress, running applications may wrongly trigger an ICPLB miss and be killed. after playing a bit more, here's a test case that may be triggering the same bug.

to reproduce:

- build 2008R1 branch using default BF537-STAMP configs

- enable MPU and bump silicon version to 0.3

- build sample code below as FLAT and install it as /bin/syscall on the board

- run sample program

- telnet into the board and attempt to run top

sometimes the you trigger a double fault, sometimes an ICPLB miss

#include <stdio.h>

#include <unistd.h>

int main(int argc, char *argv[])

{

puts(".");