Hi ! I'm really no expert but am very interested in the subject.
Did you modify the device tree ? From what I understand in the DT that you'll find pinmux definition right ? Regards. 2015-06-04 14:01 GMT+02:00 Andreas Enbacka <andreas.enba...@gasera.fi>: > Hello, > > > > After a long break, I have returned to the Yocto project, and generally > very pleased. A lot of progress has been done since I last used the project > (two years ago), and now in my opinion everything works very smoothly. > > > > I have used yocto to build a custom image for the RaspberryPi Compute > Module. Generally everything works ok, however I am experiencing problem > with accessing the UART1 port on the raspberryPi. I am using a library > called wiringPi to put the appropriate GPIO pins in the correct mode (alt5) > for RXD1/TXD1 (pins 32/33). Also I have used menuconfig to enable the > 8250/16550 serial port support in the kernel (3.18.5+). After booting the > image I examined the dmesg output, and it shows following information > related to 8250/16550: > > .. > > [ 1.010958] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled > > [ 1.013920] serial8250.0: ttyS0 at MMIO 0x20215040 (irq = 29, base_baud > = 7812500) is a 8250 > > … > > > > Then I put the pins 32/33 into alternative mode alt5, and try to connect > to the port /dev/ttyS0 using minicom (baud 115200). Trying to enter > something into the Mincom terminal does not give any indications on our > connected oscilloscope (connected to the relevant pins), however change of > the alt mode earlier was observed correctly. The serial port should not be > using any flow control, but when trying to disable the flow control using > Minicom (it was on by default) freezes the complete RaspberryPi system > (requiring to disconnect and reconnect power). > > > > Does anyone have any thoughts what could be the cause of these issues > (e.g., problems with driver etc)? Any information would be greatly > appreciated. In the project we are working on we would need to use both > uart ports (0/1) provided by the compute module (the uart0 is a pl011 and > by disabling console use of /dev/ttyAMA0 we were able to successfully > connect to that port). > > > > Thanks for the great work with the Yocto platform. > > > > Sincerely, > > Andreas Enbacka > > SW designer > > Gasera Ltd > > > > -- > _______________________________________________ > yocto mailing list > yocto@yoctoproject.org > https://lists.yoctoproject.org/listinfo/yocto > >
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