diff options
| -rw-r--r-- | os/common/startup/ARM/devices/SAMA5D2/boot.S | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/os/common/startup/ARM/devices/SAMA5D2/boot.S b/os/common/startup/ARM/devices/SAMA5D2/boot.S index 2de5be0f2..1e7809f24 100644 --- a/os/common/startup/ARM/devices/SAMA5D2/boot.S +++ b/os/common/startup/ARM/devices/SAMA5D2/boot.S @@ -76,6 +76,15 @@ Boot_Handler: ldr r1, =SFR_L2CC_HRAMC str r0, [r1] b Reset_Handler + /* + * Enabling Cycle counter + */ + mrc p15, 0, r0, c9, c12, 0 // read PMCR register + orr r0, r0, #(0x1) // set E bit 0 to enable counter + mcr p15, 0, r0, c9, c12, 0 // write r0 + mrc p15, 0, r0, c9, c12, 1 // read PMCNTENSET register + orr r0, r0, #(0x1 << 31) // set bit 31 to enable counter + mcr p15, 0, r0, c9, c12, 1 // write r0 #endif /* !defined(__DOXYGEN__) */ /** @} */ |