configs/raspberrypicm5io: new defconfig

This configuration builds an image for the Compute Module 5 IO Board.

Note: Unlike the Raspberry Pi 5 and its dedicated debug uart connector,
the kernel console on Compute Module 5 IO Board is back to UART0
(ttyAMA0) on PIN8 (GPIO14, TX, yellow) and PIN10 (GPIO15, RX, orange) on
the 40-pin header, as the former version of the Raspberry Pi.

Signed-off-by: Gaël PORTAY <gael.portay+rtone@gmail.com>
Signed-off-by: Julien Olivain <ju.o@free.fr>

board/raspberrypi/config_cm5io.txt

@@ -0,0 +1,24 @@
+# Please note that this is only a sample, we recommend you to change it to fit
+# your needs.
+# You should override this file using BR2_PACKAGE_RPI_FIRMWARE_CONFIG_FILE.
+# See http://buildroot.org/manual.html#rootfs-custom
+# and http://elinux.org/RPiconfig for a description of config.txt syntax
+
+kernel=Image
+
+# To use an external initramfs file
+#initramfs rootfs.cpio.gz
+
+# Disable overscan assuming the display supports displaying the full resolution
+# If the text shown on the screen disappears off the edge, comment this out
+disable_overscan=1
+
+# enable RTC
+dtparam=i2c_vc=on
+dtoverlay=i2c-rtc,pcf85063a,i2c_csi_dsi
+
+# enable dwc2 USB controller (USB 2.0)
+dtoverlay=dwc2,dr_mode=host
+
+# Enable UART0 for serial console on ttyAMA0
+dtparam=uart0_console=on