> when i enable the original dtb file, the board is now working, I
am
> however succeeded in soldering a serial connection to the board.
>
> The only strange thing is when i send from one side:
>
> echo -en '\x00' > /dev/ttyS0 i receive 0x00 in hex
> echo -en '\x01' > /dev/ttyS0 i receive 0x7F in hex
>
> --> this makes the serial output unreadable since the mapping of
> characters seems to be off, does anyone has an idea how to fix
> this?
>
> --> i tried this with a baudrate of 300 to be sure the connection
> is
> stable.
All Allwinner devices I've seen use a rate of 115200, it may be that
the serial port isn't enabled by default in u-boot and/or the
DeviceTree because of it being a tablet and it not having one by
default so you might nee to look at what needs to change for that to
work.
its not really clear to me, but since i am capable to send data over in
hex, its seems that its enabled and also working on a rate of 300.
Because when i send '\x01\x01' i receive 0x7f7f on the receiver side.
Just to be clear i opened the serial terminal on my tablet as well
(from within fedora running on tablet) at a baudrate of 300.
Could it be that the dts is using the wrong serial device driver?
Are there many different serial drivers for the allwinner a10?
I am using this one:
serial@01c28000 {
compatible = "snps,dw-apb-uart";
reg = <0x1c28000 0x400>;
interrupts = <0x1>;
reg-shift = <0x2>;
reg-io-width = <0x4>;
clocks = <0x3c 0x10>;
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <0x3d>;
};
I might be able to find out which serial device is used in the android
fex files.
> > --> i tried to attach my serial output to the input of the pc and
> > that
> > return fine, so it seems the 2 serial ports are actually speaking
> > another dialect.
> >
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