Perf failed on OMAP5 EVM

Hi,

I used Perf on OMAP5 EVM, when I typed "perf stat sleep 2", it reports:

Performance counter stats for 'sleep 2':

6.896972 task-clock # 0.003 CPUs utilized

1 context-switches # 0.145 K/sec

0 cpu-migrations # 0.000 K/sec

102 page-faults # 0.015 M/sec

<not supported> cycles

<not supported> stalled-cycles-frontend

<not supported> stalled-cycles-backend

<not supported> instructions

<not supported> branches

<not supported> branch-misses

2.009647299 seconds time elapsed

It seems that it cannot use PMU hardware.

My Environment is based on GLSDK OMAP5 EVM 6.03.00.01 and Perf version is 3.8.13 which is made by "./build-specific-recipe.sh omap5-evm perf" command.

Best Regards