Public bug reported:
Impact:
Overlay files are dtb fragments that, upon boot, patch the main dtb board
file to enable Raspberry Pi board hardware extension commonly know as
Raspberry HATs.
This mechanism works fine for the bionic/raspi2 kernel, while it didn't
work for the raspi2 arm64 variant since our dtb files are missing symbols
there.
This patch instruct the device tree compiler to add symbols to the dtb
files during the 'make dtbs' target, and fix overlay patching for
bionic/raspi2 arm64.
The resulting increase is size is negligible (~30kb for the whole kernel
package).
Fix:
Apply the patch, build, install and reboot:
/boot/firmware/config.txt:
...
dtoverlay=pitft35-resistive
/boot/firmware/cmdline.txt:
dwc_otg.lpm_enable=0 console=serial0,115200 console=tty1 root=/dev/mmcblk0p2
rootfstype=ext4 elevator=deadline rootwait fbcon=map:10 fbcon=font:VGA8x8
dmesg:
...
[ 5.157547] fb_hx8357d: module is from the staging directory, the quality is
unknown, you have been warned.
[ 5.158349] fbtft_of_value: buswidth = 8
[ 5.158362] fbtft_of_value: debug = 0
[ 5.158366] fbtft_of_value: rotate = 90
[ 5.158372] fbtft_of_value: fps = 25
ubuntu@raspi64:~$ ls -la /dev/fb1
crw-rw---- 1 root video 29, 1 Jan 28 15:58 /dev/fb1
Regression risk:
We only change how the arm64 raspi2 dtbs are generated, and since we
didn't produce any image using this kernel so far, the regression risk
is zero.
---
** Affects: linux-raspi2 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1782121
Title:
arm64: overlays don't get applied
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