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Linux/AM3358: UART data loss

Part Number: AM3358

Tool/software: Linux

I'm developing on serial interface using 8250 driver.

As you see,

After RTS signal is raised , some receive data is input.

I think that if RTS signal is up, No more data is received.

i'm using SDK version "ti-processor-sdk-linux-am335x-evm-02.00.02.11"

And, i disabled DMA  (CONFIG_SERIAL_8250_DMA=n)

if i enable DMA, There is no RTS signal raised, even if buffer is fulled.

What do i fix?

Does somebody have any idea? Thanks!