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I an using Armbian on an orange pi zero SBC

uname -a  
Linux orangepi 4.19.57-sunxi #5.90 SMP Fri Jul 5 17:58:43 CEST 2019 armv7l armv7l armv7l GNU/Linux

This is in relation to displaying Armbian output on an LCD module

lsmod gives me this:

$ lsmod | grep fb
fb_ili9340             16384  0
fbtft_device           40960  0
fbtft                  28672  2 fbtft_device,fb_ili9340

I am not sure at this point but I think fb_ili9340 should not be running (that is, it is not the chipset used in the the current LCD I am working on, although it is possible that my current LCD is compatible with/is a clone of the ili9340).

Is there any way to find out when the fb_ili9340 module is getting loaded? There is another file that I made manually

/etc/modules-load.d/modules.conf  
fbtft  
fbtft_device

so I can sort of see why fbtft and fbtft_device are loaded. I also have a

/etc/modprobe.d/fbtft.conf  
options fbtft_device rotate=90 name=waveshare32b busnum=1 gpios=dc:3,reset:0 speed=32000000

file, which I think just specifies the parameters to use when loading the fbtft_device module. But I don't know where fb_ili9340 is coming from. What is the proper way to find out this information?

user13267
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  • Since ARM systems like the various Pi's tend not to have autoprobeable buses, their hardware detection and module autoloading relies on a device tree blob file loaded along with the kernel by your bootloader.[See this question](https://unix.stackexchange.com/q/289563/258991): make sure the `device-tree-compiler` package is installed, then run `dtc -I fs /sys/firmware/devicetree/base` or perhaps `dtc -I fs /proc/device-tree` if the `/sys/firmeware/devicetree/base` does not exist. If results don't match reality, you'll need to customize your device tree or its overlays. – telcoM Nov 04 '21 at 00:26
  • @telcoM I don't know if I have device-tree-compiler (is it a command like "armbian-add-overlay" ?) but dtc --ver shows `Version: DTC 1.5.0`. Should having dtc be enough? – user13267 Nov 04 '21 at 03:02

0 Answers0