Quadrifoglio Verde

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Posts posted by Quadrifoglio Verde


  1. Hello,

    i have Hummingboard 1 with mainline kernel 4.11.6.

    And i have problem with GPIOs, after exporting GPIO 72 (also i try 73,71,1 / pin 11,13,7), set direction to OUT and value to 0 i have still 3.3V on pin 12 (11,13,7...).

     

    Also try 72 as OUT value 1 and 73 as IN ... and short this pins 11-12 by wire.

     

    gpiochip2: GPIOs 64-95, parent: platform/20a4000.gpio, 20a4000.gpio:
     gpio-68  (                    |PCIe reset          ) out hi
     gpio-69  (                    |gpio-ir-recv        ) in  hi
     gpio-72  (                    |sysfs               ) out hi
     gpio-73  (                    |sysfs               ) in  lo
     gpio-83  (                    |brcm_reg            ) out lo
     gpio-86  (                    |usb_otg_vbus        ) out lo


     

    73 read as LOW.

     

    Also i try wiringX and test app "wiringx-read 1 0":

    running on a hummingboard
    Writing to GPIO 1: High
    Reading from GPIO 0: 0
    Writing to GPIO 1: Low
    Reading from GPIO 0: 0

     

    please help me :-)

    thanks.

     


  2.  

    More specifically, after editing config file, execute in u-boot sources root directory

    git diff configs/A20-OLinuXino-Lime2_defconfig > my_dram_settings.patch
    

    and place it in one or both of these paths

    userpatches/u-boot/u-boot-default
    userpatches/u-boot/u-boot-next
    

     

    Hello, It works, but only for booting from SD, when board boot from NAND then freq. is back on 480Mhz.

    Can somebody help me, how to keep lower frequency in case when board boot from NAND?

     

    thank you.