config.txt

# For more options and information see 
# http://www.raspberrypi.org/documentation/configuration/config-txt.md
# Some settings may impact device functionality. See link above for details
#
# For Device-tree overlays, please reference overlays/README on the boot partition.
#

[PI0W]
initramfs rootfs-13.1.0.gz,modules-5.10.77.gz,dr_n_u.gz followkernel
kernel kernel-5.10.77-piCore.img

[ALL]
cmdline cmdline.txt

# Uncomment some or all of these to enable the optional hardware interfaces
#dtparam=i2c_arm=on
#dtparam=i2s=on
#dtparam=spi=on

# Additional overlays and parameters are documented /boot/overlays/README
hdmi_force_hotplug=1 #force HDMI output rather than DVI.
dtoverlay=gc9a01 #setup GC9A01 based LCD to '/dev/fb1' on 'spi0'
hdmi_cvt=240 240 60 1 0 0 0 #<width> <height> <framerate> <aspect> <margins> <interlace>
hdmi_group=2 #set DMT group (Display Monitor Timings: the standard typically used by monitors)
hdmi_mode=87 #set DMT mode.
hdmi_drive=2 #force a HDMI mode rather than DVI.