uboot中log处理

位图或logo和开机显示画面，是两个完全不同的东西。

logo显示uboot相关信息，如版本号等。

开机画面是用户下载到固定位置后uboot加载的。

1.开机画面

在uboot中使用splash screen可以实现u-boot启动后，在LCD上显示自定义图片。

#define CONFIG_SPLASH_SCREEN 　　1

#define CONFIG_EXTRA_ENV_SETTINGS 　　

　　"splashimage=10080000"

并且要定义splashimage变量以及splash变量所定义的地址存放bmp图片。

2. log图片

include/bmp_logo.h  //定义logo相关属性及数据， 由工具制作而成。

  12 #define BMP_LOGO_WIDTH      240
  13 #define BMP_LOGO_HEIGHT     109
  14 #define BMP_LOGO_COLORS     30
  15 #define BMP_LOGO_OFFSET     16

3.实现过程

common/lcd.c

start_armboot()  -->  devices_init()/devices.c

                                                 -->drv_lcd_init()/ common/lcd.c

                                                           -->lcd_init() /common/lcd.c

                                                                -->lcd_clear()

                                                                           -->lcd_logo()

                                                                                     --> lcd_display_bitmap(addr, 0, 0);  //显示开机画面

                                                                                     --> bitmap_plot(0, 0);  //显示logo

4.lcd相关数据结构，定义于include/lcd.h

typedef struct vidinfo {
162     u_long vl_col;      /* Number of columns (i.e. 640) */
163     u_long vl_row;      /* Number of rows (i.e. 480) */
164     u_long vl_clk;  /* pixel clock in ps    */
165
166     /* LCD configuration register */
167     u_long vl_sync;     /* Horizontal / vertical sync */
168     u_long vl_bpix;     /* Bits per pixel, 0 = 1, 1 = 2, 2 = 4, 3 = 8, 4 = 16 */
169     u_long vl_tft;      /* 0 = passive, 1 = TFT */
170
171     /* Horizontal control register. */
172     u_long vl_hsync_len;    /* Length of horizontal sync */
173     u_long vl_left_margin;  /* Time from sync to picture */
174     u_long vl_right_margin; /* Time from picture to sync */
175
176     /* Vertical control register. */
177     u_long vl_vsync_len;    /* Length of vertical sync */
178     u_long vl_upper_margin; /* Time from sync to picture */
179     u_long vl_lower_margin; /* Time from picture to sync */
180
181     u_long  mmio;       /* Memory mapped registers */
182 } vidinfo_t;
183
184 extern vidinfo_t panel_info;
typedef struct vidinfo {
162     u_long vl_col;      /* Number of columns (i.e. 640) */
163     u_long vl_row;      /* Number of rows (i.e. 480) */
164     u_long vl_clk;  /* pixel clock in ps    */
165
166     /* LCD configuration register */
167     u_long vl_sync;     /* Horizontal / vertical sync */
168     u_long vl_bpix;     /* Bits per pixel, 0 = 1, 1 = 2, 2 = 4, 3 = 8, 4 = 16 */
169     u_long vl_tft;      /* 0 = passive, 1 = TFT */
170
171     /* Horizontal control register. */
172     u_long vl_hsync_len;    /* Length of horizontal sync */
173     u_long vl_left_margin;  /* Time from sync to picture */
174     u_long vl_right_margin; /* Time from picture to sync */
175
176     /* Vertical control register. */
177     u_long vl_vsync_len;    /* Length of vertical sync */
178     u_long vl_upper_margin; /* Time from sync to picture */
179     u_long vl_lower_margin; /* Time from picture to sync */
180
181     u_long  mmio;       /* Memory mapped registers */
182 } vidinfo_t;
183
184 extern vidinfo_t panel_info;
该结构体示例化panel_info定义于board/atmel/at91sam9g10ek/sam9g10ek.c中：
297 vidinfo_t panel_info = {
298     vl_col:     320,
299     vl_row:     240,
300     vl_clk:     6400000,
301     vl_sync:    ATMEL_LCDC_INVLINE_INVERTED |
302             ATMEL_LCDC_INVFRAME_INVERTED|
303             ATMEL_LCDC_INVCLK_INVERTED,
304     vl_bpix:    3,
305     vl_tft:     1,
306     vl_hsync_len:   1,
307     vl_left_margin: 70,
308     vl_right_margin:18,
309     vl_vsync_len:   1,
310     vl_upper_margin:13,
311     vl_lower_margin:9,
312     mmio:       AT91SAM9261_LCDC_BASE,
313 };