Steps to Reproduce the Issue:
1. Configure 1 UART with DMA enabled and configure BCDMA instant from syscfg.
2. Generate code and Compile and load an example from CCS
Root Cause Analysis:
• Currently, two instances of DMA are being generated: BCDMA and PKTDMA.
• When configuring UART with DMA, the generated code always selects the 0th instance.
• However, in the generated code, the 0th instance is assigned to BCDMA instead of PKTDMA, causing the issue.

Fix Details:
• Ensure that the UART DMA ch config is always picks the PKTDMA instant rather than BCDMA instant ..
Please look at the fix details in the link below ..

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1485815/am6421-bcdma-and-pktdma-configuration-problem/5711608#5711608