Hi Yu,
The Linux UART driver is a char driver and DMA is not supported. See on page 5 in this link: http://ladd00.triumf.ca/~olchansk/MityARM/TI/ti-sdk-am335x-evm-06.00.00.00/docs/AM335x-PSP-04.06.00.11-Features-and-Performance-Guide.pdf
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