I tried the RLE with DMA destination address to 0x78000080 and DMA source address to 0x780000C0.
I have used a working sample code from Rainbow with MCR.GRLE_EN = 0.
The code doesn't seem to complete the decoding. ISR register has a value of 0x38, which looks like the DMA for reading the tx fifo didn't happen. Let me know if I am missing any configurations?