However, I managed to get the screen to work under Archlinux too:
From the Adafruit website we can find the kernel patch, so we can compile our kernel image that supports the screen.
However I wanted a quicker solution.
So I wanted to give this way a try.
Download the “ready to go image” from the Adafruit website and unzip it.
To mount the .img with
mount, we need to know the offset first.
So we have to execute the command:
fdisk -l 2016-10-18-pitft-28r.img
From the output of
fdisk, I saw that the block is 512 bytes while the start is 8192. So the offset is 512*8192 = 4194304.
So now we can mount with:
mount -o loop,offset=4194304 2016-10-18-pitft-28r.img pitft_image/
And in there there are indeed the .dtbo file that we are looking for:
It seems that the 2.8” overlay works for the 2.4” too.
So we just copy it to the overlays folder under /boot/:
cp pitft_image/overlays/pitft28-resistive.dtbo /boot/overlays/
After that we need to edit the file
/boot/config.txt so that the kernel will load the overlay. We need to add the following lines:
dtparam=i2c_arm=on<br /> dtparam=i2c_vc=on<br /> dtparam=spi=on<br /> dtoverlay=pitft28-resistive,rotate=90,speed=32000000,fps=20
Also, we need to edit the file
/boot/cmdline.txt, adding some kernel parameters after
rootwait fbcon=map:10 fbcon=font:VGA8x8 consoleblank=0
After this just reboot and the tft screen should work.