RTT

Since V6.98b of the J-Link software, RTT can be used out-of-the-box.
When using RTT control block auto-detection, J-Link searches in the internal SRAM @ 0x40300000 - 0x4030FFFF (64 KiB) for an RTT control block
The internal SRAM located at 0x402F0400 cannot be used for RTT as it is not accessible by the AHB-AP via which RTT accesses are performed.
As the TI AM335x series implements cache, please refer to the RTT knowledge base article for further instructions / information: RTT knowledge base article

TI AM335x