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Trouble with UARTLITE kernel driver

Former Member

I added the UARTlite IP to my zedboard design and routed the IO through JA PMOD pins. I successfully exported the design to XSDK, built the FSBL, rebuilt the kernel with UARTlite support, and boot into Linaro Ubuntu. I'm using the FMCOMMS2/3 reference design from ADI.

I basically followed the procedure outlined here, except I only have a single UARTlite:

http://www.wiki.xilinx.com/Uartlite+Driver

I'm not seeing any uartlite device at /dev/ttyULx as per the URL.

I examine the contents of /proc/config.gz and the configuration appears to be set for the UARTLITE kernel driver:

root@linaro-ubuntu-desktop:/home/analog# cat config | grep UARTLITE
CONFIG_SERIAL_UARTLITE=y
# CONFIG_SERIAL_UARTLITE_CONSOLE is not set

What could be the issue?

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    I had encountered similar problem recently. I made changes in the device tree to incorporate uartlite and recompiled. ttyUL0 was shown in /dev. My reference design was adv7511 for ZedBoard.

    When I use the fopen() in my application program, it successfully detects the ttyUL0. However, there is no output when I use fread(). It does not work even in loopback mode. Can anyone help me with this issue?

    Thanks,
    Vedangi