We're using GCC toolchain from Linaro (launchpad.net/gcc-arm-embedded/4.7/4.7-2013-q1-update) on STM32F401CC. We try to use embOSView using J-Link or J-Trace for Cortex-M through SWD but without any success. Changing "target interface" Speed doesn't help. Below are messages from log window:
005:116: MEM: Error whilre erading 3 bytes properties from address 0xfffffffd.
010:342: COM4 opened (38400 baud. Handle 2a0)
010:342: COM4 closed

010:342: All COMPORTS closed

016:536: MEM: Magic id mismatch. Expected: 0x52, got 0x00
021:013: COM4 opened )38400 baud. Handle 338=


021:013: COM4 closed

021:013: All COMPORTS closed
032:027: MEM: Timeout waiting for target ready.