Memory read operation timed out

Hello,

I'm getting the following error if I connect to an EFM32GG890F1024:

Connecting 'Olimex ARM-USB-OCD'
  IDCODE 0x2ba01477 SW-DP VERSION 1
  AP 0 0x24770011 AHB-AP for CM3 Rev 2 Little Endian
  Identifying
    ROM Table 0xe00ff000
    CM3-SCS Rev 0 Base Address 0xe000e000
    DWT Rev 3 Base Address 0xe0001000
    Generic IP component ID 0xb105e00d Base Address 0xe0002000 Peripheral ID 0x00002bb003 4KB Count = 1 JEP 106 code = 0x0 0x3b RevAnd 0x0 Customer Modified 0x0 Rev 2 Part Number 0x003 Device ID 0x00 Device Type 0x00
    Cortex-M0+ r14p4
  Memory read operation timed out

Anybody can help me?

Thanks Christian