I sent the fifo control register for Bluetooth's UART a 0x07. This set the ITL flag so that it cause an interrupt if the fifo has 1 or more bytes in it. The theory is that this will make the UARTs respond quicker to each other.<\p>
echo 0x07 > /proc/platx/registers/BTFCR
I sent the modem control register a 0x03. This enabled the UART interrupt. I don't understand why this was off. However, this made things worse.
echo 0x03 > /proc/platx/registers/BTMCR