enable LCD beaglebone black

Hi,

Kernel 3.8 uses device trees to configure the peripherals. With your new LCD, you just need to describe it in a device tree and provide it to the kernel without the need to recompile the kernel.

Please follow these links to learn more about device tree usage:

http://linuxgizmos.com/introducing-the-new-beaglebone-black-kernel/
https://github.com/jadonk/validation-scripts/tree/master/test-capemgr

Best regards,
Miroslav

Thank you very much! I tried to load with the echo command pinctrl-test-7> $ SLOTS (export SLOTS = / sys/devices/bone_capemgr.8/slots) but I get the following error:-sh: echo: write error: no such file or directory. Why?

Best regards,

Dalla Vecchia Giulio

Hi,

Take a look at this article: http://www.elinux.org/BeagleBone_and_the_3.8_Kernel#Porting_to_the_new_DT_kernel_FAQ

I think the command you use will actually try to load the file /lib/firmware/pinctrl-test-7-<version>.dtbo if you have supplied a "version" parameter in the device tree overlay file. I guess this dtbo file doesn't exist and hence you are receiving an error message.

Best regards,
Miroslav

I'm uploading BB-BONE-LCD7-01 to turn on the LCD with the command:
echo BB-BONE-LCD7-01> / sys/devices/bone_capemgr.8/slots but I get the error echo: write error: no such file or directory, why? The file BB-BONE-LCD7-01-00A2 is present in / lib / firmware.

Best regards,

Dalla Vecchia Giulio

Hi,

Are you sure the "version" parameter in the device tree overlay file is "00A2"? Also, does your device tree file inside /lib/firmware/ have ".dtbo" extension? I guess the kernel is quite strict about these file names.

Best regards,
Miroslav

It file.dtbo is present in the / lib / firmware version 00A2

I wanted to charge the device LCD7, I managed in the following way: In the file am335x-bone-common.dtsi I added

slot @ 103 {
you, cape-override;
compatible = "ti, BeagleBone-black";
board-name = "Bone-LCD7";
version = "00A2";
manufacturer = "Julius";
part-number = "BB-BONE-LCD7-01";
};

then I recompiled the kernel. at boot time the LCD is on. But the memory eMMC is not loaded then I do not see between devices, why?

This is my file am335x-bone-common.dtsi:

http://dropcanvas.com/06ndc

Best regards,

Dalla Vecchia Giulio

Hello, Dalla. I just encounter the same problem. Can you share your solution with me? Thanks a lot.

echo BB-BONE-LCD7-01:00A2 > / sys/devices/bone_capemgr.8/slots. It works.