A10-MID UART

After 3 days of probing my tablet with an oscilloscope I can report that I (specing@#arm-netbook) have (28.6.2012) found an alternative serial port (No more mmc trade-offs :) ). The RX pin should be one of those pins near it.

The serial port is located on the back of the board, near to the NAND and behind the A10. The serial port in question is UART5 (ttyS5) on PI10:

[uart_para5] uart_used = 1 uart_port = 5 uart_type = 2 uart_tx = port:PI10<3> uart_rx = port:PI11<3>

The tx pin is also shared with the G sensor.



More board pictures and nanda dumps are available from: my website

You can use the serial_spammer.c program available from my site

to output a specific byte over and over again on the serial ports

(I have uploaded a precompiled statically-linked binary for those who

do not have Gentoo at hand :) ).

Note: I have tried to enable all eight serial ports at once through script.bin, but it seems that that number is limited to 4 at a time. Maybe whoever configured the stock kernel did not enable [*] "Device drivers" -> "Character devices" -> "Serial drivers" -> "Support more than 4 legacy serial ports" or some other option on the same page. The meaning of the error is still unknown to me:

<3>[   0.290000] sw-uart.1: failed to claim resource 0 <3>[   0.290000] sw-uart.6: failed to claim resource 0 <6>[   0.290000] sw-uart.0: ttyS0 at MMIO 0x1c28000 (irq = 1) is a sw-uart0 <6>[   0.300000] sw-uart.5: ttyS5 at MMIO 0x1c29400 (irq = 18) is a sw-uart5
 * 1) dmesg | grep uart