[Hummingboard 1 - GPIO not working]

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.

 

[Freezing problem with Olimex A20 Lime 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.