How to enable frame buffer console

[NathanChiu95]

Hi, I would like to show the boot logs on the mipi LCD with frame buffer console, but I cannot get it working.

I hv added the following in build\boards\sg200x\sg2002_licheervnano_sd\linux\sg2002_licheervnano_sd_defconfig:

CONFIG_FB=y
# CONFIG_FB_CVITEK=m ## This is origional
CONFIG_FB_CVITEK=y
# CONFIG_FRAMEBUFFER_CONSOLE=y This is new add
CONFIG_FRAMEBUFFER_CONSOLE=y

also, the following in u-boot-2021.10\include\configs\mars-asic.h:

	/* config uart */
	#ifdef MAP_CONSOLE_TO_FBCON
		#define CONSOLEDEV "tty1\0" // This is for fbcon, new added by user
		#define CONSOLEDEV_SERIAL "ttyS0\0"
		#define MAP_FB_CON " fbcon=map:0\0"
	#else
		#define CONSOLEDEV_SERIAL "ttyS0\0"
		#define MAP_FB_CON " "
	#endif

	#define OTHERBOOTARGS   "earlycon=sbi riscv.fwsz="  __stringify(CVIMMAP_OPENSBI_SIZE) " " \
		EARLYCON_RELEASE CONSOLE_LOGLEVEL MAP_FB_CON

	#ifdef MAP_CONSOLE_TO_FBCON // This is for fbcon, new added by user
		#define CONFIG_EXTRA_ENV_SETTINGS	\
			"netdev=eth0\0"		\
			"consoledev=" CONSOLEDEV  \
			"consoledev_serial=" CONSOLEDEV_SERIAL  \
			"baudrate=115200\0" \
			"uImage_addr=" __stringify(UIMAG_ADDR) "\0" \
			"update_addr=" __stringify(UPDATE_ADDR) "\0" \
			"mtdparts=" PARTS "\0" \
			"mtdids=" MTDIDS_DEFAULT "\0" \
			"root=" ROOTARGS "\0" \
			"sddev=0\0" \
			"sdboot=" SD_BOOTM_COMMAND "\0" \
			"sdbootauto=" SD_BOOTM_COMMAND_AUTO "\0" \
			"othbootargs=" OTHERBOOTARGS "\0" \
			"loadenvcmd=mmc info;load mmc 0:1 ${uImage_addr} uEnv.txt; if test $? -eq 0; then env import ${uImage_addr} - ; fi;\0" \
			PARTS_OFFSET
	#else

	#ifdef MAP_CONSOLE_TO_FBCON // This is for fbcon, new added by user
		#define SET_BOOTARGS "setenv bootargs ${reserved_mem} ${root} ${mtdparts} " \
						"console=$consoledev $othbootargs;"
	#else

so that the bootargs=root=/dev/mmcblk0p2 rootwait rw console=tty1 earlycon=sbi riscv.fwsz=0x80000 loglevel=9 fbcon=map:0

I rebuilt it and created /boot/fb when I do lsmod, soph_fbis enabled and there is existing /dev/fb0

But still, no console was shown on the MIPI LCD