Always read everything ... (sorry) : make service-install (instead of make) will solve error and compile display-service (what I wanted)

root@homeassistant:/usr/src/tm16xx-display# make make EXTRA_CFLAGS="-DCONFIG_TM16XX -DCONFIG_TM16XX_KEYPAD -DCONFIG_TM16XX_I2C -DCONFIG_TM16XX_SPI -include /usr/src/tm16xx-display/drivers/auxdisplay/tm16xx_compat.h -I/usr/src/tm16xx-display/include/" -C /lib/modules/6.12.58-current-rockchip64/build M=/usr/src/tm16xx-display/drivers/auxdisplay CONFIG_TM16XX=m CONFIG_TM16XX_KEYPAD=y CONFIG_TM16XX_I2C=m CONFIG_TM16XX_SPI=m CONFIG_LINEDISP=m modules make[1]: Entering directory '/usr/src/linux-headers-6.12.58-current-rockchip64' CC [M] /usr/src/tm16xx-display/drivers/auxdisplay/line-display.o CC [M] /usr/src/tm16xx-display/drivers/auxdisplay/tm16xx_core.o CC [M] /usr/src/tm16xx-display/drivers/auxdisplay/tm16xx_keypad.o LD [M] /usr/src/tm16xx-display/drivers/auxdisplay/tm16xx.o CC [M] /usr/src/tm16xx-display/drivers/auxdisplay/tm16xx_i2c.o CC [M] /usr/src/tm16xx-display/drivers/auxdisplay/tm16xx_spi.o MODPOST /usr/src/tm16xx-display/drivers/auxdisplay/Module.symvers CC [M] /usr/src/tm16xx-display/drivers/auxdisplay/line-display.mod.o In file included from /usr/src/tm16xx-display/drivers/auxdisplay/line-display.mod.c:2: /usr/src/tm16xx-display/drivers/auxdisplay/line-display.mod.c:13:41: error: expected ‘)’ before ‘LINEDISP’ 13 | KSYMTAB_FUNC(linedisp_attach, "_gpl", ""LINEDISP"");

@GmP thank you for sharing your dtso file! lsmod | grep tm tm16xx 28672 0 stmmac_platform 20480 1 dwmac_rk stmmac 241664 3 stmmac_platform,dwmac_rk pcs_xpcs 28672 1 stmmac root@homeassistant:/boot# lsmod | grep i2c i2c_gpio 16384 0 i2c_algo_bit 12288 1 i2c_gpio root@homeassistant:/boot# ls /sys/bus/i2c/devices/ 4-0024 i2c-0 i2c-4 i2c-5 root@homeassistant:/boot# ls /sys/class/leds/display brightness device digits map_seg7 max_brightness num_digits num_segments power segments subsystem trigger uevent value root@homeassistant:/boot# ls -l /sys/class/leds/ Linux homeassistant 6.12.58-current-rockchip64 #3 SMP PREEMPT Thu Nov 13 20:34:41 UTC 2025 aarch64 GNU/Linux on a T9 rk3318

You’re more than welcome to clone my repository and fix the frame buffer console. All the sources are there except u-boot.

Got it connected now to a simple 13.8V PSU and it’s working a treat, just working my way around Linux and Runners but all good ! Thank you for the help @eselarm!