Hi, On Thu, Feb 13, 2014 at 04:09:14PM -0800, Юрий Пухальский wrote: > Hello! > > I have an A13-olinuxino board with 3.13-rc4 kernel from sunxi-next branch > (from December I think). I have a custom hardware which should talk to the > A13 by serial line.
What kind of hardware is that? > Atm it's connected to GPIO2 pins 12,14 (and GND) which is PE10&PE11 pins. > But that doesn't work. How exactly? What are you trying to do, what doesn't work and how do you test it? > I try to connect the hardware through USB-serial converter PL2303 to the > same board, it works. > I've read the forums, there's no tty on UART1 now, so nothing should > hinder. But I've connected the serial console through it recently, so UART1 > circuitry appears to be working. Hmmm, so is it working, or doesn't it work? I'm confused here.... > Sorry if my questions are silly, I have never worked with it. > Are pins 152 and 124 leading to the same circuitry inside the CPU, but > outside are connected to different places, namely GPIO2 and UART1? Yes, the same internal pin is routed to several external pins, to allow some flexibility in the hardware design. > I've read about multiplexing, and see that in the A13 spec UART1_TX from > these pins are in the second column (mode1?), do I need to configure > something so they are put into this mode, or it happens automatically? It > appears that it works automatically, I've configured UART3 to PG9&PG10 and > it works ok… > I'm completely lost here, maybe you can advise a way of debugging it? Please tell what you're trying to do exactly, what issues are you facing, and paste your custom device tree. Thanks! -- Maxime Ripard, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com
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