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AM6548: Using WKUP_UART0 as communication port

Tony Tang
Mastermind 28952 points
Part Number: AM6548

Customer change to UART0 as Linux debug console port., it works, but WKUP_UART0 still output the first message of UBOOT as below. 

#1. Is the SPL/UBOOT not changed in right way? or is it related to the silicon?

#2. can use WKUP_UART0 as general communication port? 

  • 0
    TI__Mastermind 44585 points

    Hello Tony,

    It seems like wkup_uart0 is used by system firmware and I am internally checking with our experts if the message could be redirected/disabled.

    Regards,
    Krunal

  • 0 in reply to Krunal Bhargav34
    TI__Mastermind 44585 points

    Hello Tony,

    In order to remove the Uboot message, please navigate to the file <u-boot_dir>/arch/arm/mach-k3/am6_init.c and comment/remove the following lines of code:

          /*
      * Process pinctrl for the serial0 a.k.a. WKUP_UART0 module and continue
      * regardless of the result of pinctrl. Do this without probing the
      * device, but instead by searching the device that would request the
      * given sequence number if probed. The UART will be used by the system
      * firmware (SYSFW) image for various purposes and SYSFW depends on us
      * to initialize its pin settings.
      */
/*      ret = uclass_find_device_by_seq(UCLASS_SERIAL, 0, true, &dev);
      if (!ret) {
            pinctrl_select_state(dev, "default");
      } */

    Regards,
    Krunal