bcm2711: restore lost `RPI_DEBUG_CONSOLE`

- if `RPI_DEBUG_CONSOLE=yes`:
  - `config.txt`:
    - `enable_uart=1`
    - `dtoverlay=disable-bt`
  - `cmdline.txt`:
    - `console=tty1 console=ttyAMA0,115200 loglevel=7`
- this was lost in revision 1c3b7ec36c for some reason

config/sources/families/bcm2711.conf

@@ -239,6 +239,17 @@ function pre_umount_final_image__remove_esp() {
 
 # write the default config.txt config
 function pre_umount_final_image__write_raspi_config() {
+	declare comment_if_debug=""
+	declare not_comment_if_debug="#"
+	if [[ "${RPI_DEBUG_CONSOLE}" != "yes" ]]; then
+		comment_if_debug="#"
+		not_comment_if_debug=""
+		# for serial console, there is also 'BOOT_UART=1' in 'rpi-eeprom-config' but that is for an earlier stage.
+		# look at with it rpi-eeprom-config, change with 'EDITOR=nano rpi-eeprom-config --edit'
+	else
+		display_alert "Enabling debug console" "config.txt - ${BOARD} - RPI_DEBUG_CONSOLE=yes" "warn"
+	fi
+
 	cat <<- EOD > "${MOUNT}"/boot/firmware/config.txt
 		# For more options and information see
 		# http://rptl.io/configtxt
@@ -264,6 +275,11 @@ function pre_umount_final_image__write_raspi_config() {
 		# Automatically load initramfs files, if found
 		auto_initramfs=1
 
+		# bootloader logs to serial, second stage (Armbian: enable with RPI_DEBUG_CONSOLE=yes, currently: ${RPI_DEBUG_CONSOLE:-"no"})
+		${not_comment_if_debug}enable_uart=1
+		# if uart is enabled, disable Bluetooth which also uses UART
+		${comment_if_debug}dtoverlay=disable-bt
+
 		# Enable DRM VC4 V3D driver
 		dtoverlay=vc4-kms-v3d
 		max_framebuffers=2
@@ -292,8 +308,14 @@ function pre_umount_final_image__write_raspi_config() {
 }
 
 function pre_umount_final_image__write_raspi_cmdline() {
+	declare cmdline_consoles="console=serial0,115200 console=tty1 loglevel=1" # default; no idea why Gunjan had serial0 in here, it wouldn't work, but I kept it
+	if [[ "${RPI_DEBUG_CONSOLE}" == "yes" ]]; then
+		display_alert "Enabling debug console" "cmdline.txt - ${BOARD} - RPI_DEBUG_CONSOLE=yes" "warn"
+		cmdline_consoles="console=tty1 console=ttyAMA0,115200 loglevel=7"
+	fi
+
 	cat <<- EOD > "${MOUNT}"/boot/firmware/cmdline.txt
-		console=serial0,115200 console=tty1 loglevel=1 root=LABEL=${ROOT_FS_LABEL} rootfstype=${ROOTFS_TYPE} fsck.repair=yes rootwait logo.nologo cgroup_enable=cpuset cgroup_memory=1 cgroup_enable=memory
+		${cmdline_consoles} root=LABEL=${ROOT_FS_LABEL} rootfstype=${ROOTFS_TYPE} fsck.repair=yes rootwait logo.nologo cgroup_enable=cpuset cgroup_memory=1 cgroup_enable=memory
 	EOD
 
 	if [[ "${SHOW_DEBUG}" == "yes" ]]; then