Beagle Bone Black, Configuring LCD pins as GPIO's

[Co M]

Linux ev 4.4.0-112-generic #135-Ubuntu SMP Fri Jan 19 11:48:36 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

I need more GPIO's and I cannot use GPIO 11 (LCD_DATA15), 81 (LCD_DATA 11) 80 (LCD_DATA 10) and so  on.
I get following information form shell config-pin.

TI_AM335x_BeagleBone_Black
default gpio gpio_pu gpio_pd gpio_input timer
root@beaglebone:/home/s2w# config-pin -l 89
TI_AM335x_BeagleBone_Black
default gpio gpio_pu gpio_pd gpio_input timer
root@beaglebone:/home/s2w# config-pin -l 11
TI_AM335x_BeagleBone_Black
Pin is not modifyable: 11  # <<<<<<<<<<<<<<<<<<<<<<<<<<
root@beaglebone:/home/s2w#

How do I reconfigure the PIN to be modifiable and used as GPIO.
Thank you.

[Co M]

SOLVED:

/boot/uEnv.txt

disable_uboot_overlay_emmc=1
disable_uboot_overlay_video=1
disable_uboot_overlay_audio=1

[davig...@gmail.com]

Thank you!

[mgar...@singularlogistics.com]

I've the same problem. I want to use P8.27 to P8.46 as GPIO instead of LCD, but doing only the modification in the uEnv.txt you say, I can't do it work. When I got the BBB connected to my board, it doesn't start (only the blue PWR led lights permanent).

Any idea?

Thanks