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Linux/AM4379: How to dispaly a picture to LCD in uboot

Part Number: AM4379

Tool/software: Linux

my uboot version is  U-Boot SPL 2014.07

at configs/am43xx_evm.h add:

/* LCD */
#define CONFIG_LCD
#define LCD_BPP LCD_COLOR16
#define CONFIG_LCD_LOGO
#undef LCD_TEST_PATTERN
#define CONFIG_LCD_INFO
#define CONFIG_LCD_INFO_BELOW_LOGO
#define CONFIG_SYS_WHITE_ON_BLACK

at common/lcd.c add:

#define LCD_BPP LCD_COLOR16

vidinfo_t panel_info = {
.vl_col = 1280,
.vl_row = 800,
.vl_bpix = LCD_BPP,
};

at ./board/ti/am43xx/board.c add

lcd_init()

but none display at lcd,how can i do?