u-boot-2010.03在XC2440开发板上的移植—11

12、u-boot开机logo的制作

    u-boot中显示开机logo需要LCD驱动的支持，在启动过程中会在屏幕的左上角显示一个logo，默认的是一个小企鹅图片。

    先来添加适合我们开发板的LCD驱动程序，取名smdk2440_lcd.c，然后把这个文件放在drivers/video/目录下，代码如下：

/********************************************************
s3c2410 fb driver for smdk2440
********************************************************/
#include

#if defined(CONFIG_VIDEO_S3C2440)

#include
#include "videomodes.h"
#include
#include
/*
 * Export Graphic Device
 */
GraphicDevice smi;

#define VIDEO_MEM_SIZE 0x200000

#define MVAL            (0)
#define MVAL_USED         (0)     //0=each frame 1=rate by MVAL
#define INVVDEN            (1)     //0=normal 1=inverted
#define BSWP            (0)     //Byte swap control
#define HWSWP            (1)     //Half word swap control

#define VBPD            (12)
#define VFPD            (4)
#define VSPW            (10)
#define HBPD            (43)
#define HFPD            (8)
#define HSPW            (1)
#define CLKVAL_TFT        (4)

void lcd_enable(void)
{
    struct s3c24x0_gpio * const gpio = s3c24x0_get_base_gpio();
    struct s3c24x0_lcd * const lcd = s3c24x0_get_base_lcd();

    gpio->GPGUP = gpio->GPGUP & ((~(1 << 4)) | (1 << 4));
    gpio->GPGCON = gpio->GPGCON & ((~( 3 << 8)) | ( 3 << 8));
    gpio->GPGDAT = gpio->GPGDAT | (1 << 4 );

    lcd->LCDCON5 = lcd->LCDCON5 & ((~( 1 << 3)) | (1 << 3));  //PWREN
    lcd->LCDCON5 = lcd->LCDCON5 & ((~( 1 << 5)) | (0 << 5));//INVPWREN

    lcd->LCDCON1 |= 1;

    gpio->GPBUP = gpio->GPBUP & ((~(1 << 1)) | (1 << 1));
    gpio->GPBCON = gpio->GPBCON & ((~( 3 << 2)) | ( 3 << 2));
    gpio->GPBDAT = gpio->GPBDAT | (1 << 1 );
}

/*******************************************************************************
 *
 * Init video chip with common Linux graphic modes (lilo)
 */
void *video_hw_init (void)
{
    struct s3c24x0_lcd * const lcd = s3c24x0_get_base_lcd();
    GraphicDevice *pGD = (GraphicDevice *)&smi;
    int videomode;
    int bppmode;
    unsigned long t1, hsynch, vsynch;
    char *penv;
    int tmp, i, bits_per_pixel;
    struct ctfb_res_modes *res_mode;
    struct ctfb_res_modes var_mode;

    tmp = 0;

    videomode = CONFIG_SYS_DEFAULT_VIDEO_MODE;
    /* get video mode via environment */
    if ((penv = getenv ("videomode")) != NULL) {
         /* deceide if it is a string */
        if (penv[0] <= '9') {
            videomode = (int) simple_strtoul (penv, NULL, 16);
            tmp = 1;
        }
    }
    else
    {
        tmp = 1;
    }
    if (tmp) {
        /* parameter are vesa modes */
        /* search params */
        for (i = 0; i < VESA_MODES_COUNT; i++) {
            if (vesa_modes[i].vesanr == videomode)
            break;
        }
         if (i == VESA_MODES_COUNT) {
            printf ("no VESA Mode found, switching to mode 0x%x ", CONFIG_SYS_DEFAULT_VIDEO_MODE);
            i = 0;
        }
        res_mode = (struct ctfb_res_modes *) &res_mode_init[vesa_modes[i].resindex];
        bits_per_pixel = vesa_modes[i].bits_per_pixel;
    }
    else
    {
        res_mode = (struct ctfb_res_modes *) &var_mode;
        bits_per_pixel = video_get_params (res_mode, penv);
    }

    /* calculate hsynch and vsynch freq (info only) */
    t1 = (res_mode->left_margin + res_mode->xres + res_mode->right_margin + res_mode->hsync_len) / 8;
    t1 *= 8;
    t1 *= res_mode->pixclock;
    t1 /= 1000;
    hsynch = 1000000000L / t1;
    t1 *= (res_mode->upper_margin + res_mode->yres + res_mode->lower_margin + res_mode->vsync_len);
    t1 /= 1000;
    vsynch = 1000000000L / t1;

    /* fill in Graphic device struct */
    sprintf (pGD->modeIdent, "%dx%dx%d %ldkHz %ldHz", res_mode->xres, res_mode->yres, bits_per_pixel, (hsynch / 1000), (vsynch / 1000));

    pGD->winSizeX = res_mode->xres;
    pGD->winSizeY = res_mode->yres;
    pGD->plnSizeX = res_mode->xres;
    pGD->plnSizeY = res_mode->yres;

    switch (bits_per_pixel)
    {
        case 8:
            pGD->gdfBytesPP = 1;
            pGD->gdfIndex = GDF__8BIT_INDEX;
            bppmode = 11;
         break;
        case 16:
            pGD->gdfBytesPP = 2;
            pGD->gdfIndex = GDF_16BIT_565RGB;
            bppmode = 12;
         break;
        case 24:
         pGD->gdfBytesPP = 3;
         pGD->gdfIndex = GDF_24BIT_888RGB;
            bppmode = 13;
         break;
    }

    pGD->frameAdrs = LCD_VIDEO_ADDR;
    pGD->memSize = VIDEO_MEM_SIZE;

    lcd->LCDCON1 = (CLKVAL_TFT << 8) | (MVAL_USED << 7) | (3 << 5) | (bppmode << 1) | 0;
    lcd->LCDCON2 = (VBPD << 24) | (pGD->winSizeY-1 << 14) | (VFPD << 6) | (VSPW);
    lcd->LCDCON3 = (HBPD << 19) | (pGD->winSizeX-1 << 8) | (HFPD);
    lcd->LCDCON4 = (MVAL << 8) | (HSPW);
    lcd->LCDCON5 = (1 << 11) | (0 << 10) | (1 << 9) | (1 << 8) | (0 << 7) | (0 << 6) | (1 << 3) | (BSWP << 1) | (HWSWP);

    lcd->LCDINTMSK |= (3);
    lcd->LPCSEL &= (~7);
    lcd->TPAL = 0x0;

    writel((pGD->frameAdrs >> 1), &lcd->LCDSADDR1);

    /* This marks the end of the frame buffer. */
    writel((((readl(&lcd->LCDSADDR1))&0x1fffff) + (pGD->winSizeX+0) * pGD->winSizeY), &lcd->LCDSADDR2);
    writel((pGD->winSizeX & 0x7ff), &lcd->LCDSADDR3);

    /* Clear video memory */
    memset((void *)pGD->frameAdrs, 0, pGD->memSize);

    lcd_enable();

    return ((void*)&smi);
}

void video_set_lut (unsigned int index, /* color number */
                unsigned char r, /* red */
                unsigned char g, /* green */
                unsigned char b /* blue */
        )
 {
 }

 #endif

   

    在videomodes.c和videomodes.h文件中增加或者修改LCD程序smdk2440_lcd.c需要的宏CONFIG_SYS_DEFAULT_VIDEO_MODE，宏RES_MODE_480x272，宏RES_MODES_COUNT，宏VESA_MODES_COUNT，vesa_modes[]数组，res_mode_init[]数组。

    

    在videomodes.c中增加的代码如下：

const struct ctfb_vesa_modes vesa_modes[VESA_MODES_COUNT] = {
    {0x301, RES_MODE_640x480, 8},
    {0x310, RES_MODE_640x480, 15},
    {0x311, RES_MODE_640x480, 16},
    {0x312, RES_MODE_640x480, 24},
    {0x303, RES_MODE_800x600, 8},
    {0x313, RES_MODE_800x600, 15},
    {0x314, RES_MODE_800x600, 16},
    {0x315, RES_MODE_800x600, 24},
    {0x305, RES_MODE_1024x768, 8},
    {0x316, RES_MODE_1024x768, 15},
    {0x317, RES_MODE_1024x768, 16},
    {0x318, RES_MODE_1024x768, 24},
    {0x161, RES_MODE_1152x864, 8},
    {0x162, RES_MODE_1152x864, 15},
    {0x163, RES_MODE_1152x864, 16},
    {0x307, RES_MODE_1280x1024, 8},
    {0x319, RES_MODE_1280x1024, 15},
    {0x31A, RES_MODE_1280x1024, 16},
    {0x31B, RES_MODE_1280x1024, 24},
    {0x211, RES_MODE_480x272, 16},
};

const struct ctfb_res_modes res_mode_init[RES_MODES_COUNT] = {
    /* x     y pixclk le    ri up    lo hs vs s vmode */
    {640, 480, 39721, 40, 24, 32, 11, 96, 2, 0, FB_VMODE_NONINTERLACED},
    {800, 600, 27778, 64, 24, 22, 1, 72, 2, 0, FB_VMODE_NONINTERLACED},
    {1024, 768, 15384, 168, 8, 29, 3, 144, 4, 0, FB_VMODE_NONINTERLACED},
    {960, 720, 13100, 160, 40, 32, 8, 80, 4, 0, FB_VMODE_NONINTERLACED},
    {1152, 864, 12004, 200, 64, 32, 16, 80, 4, 0, FB_VMODE_NONINTERLACED},
    {1280, 1024, 9090, 200, 48, 26, 1, 184, 3, 0, FB_VMODE_NONINTERLACED},
    {480, 272, 40000, 8, 43, 2, 4, 12, 10, 0, FB_VMODE_NONINTERLACED},
};

    在videomodes.h中修改和增加的代码如下：

#ifndef CONFIG_SYS_DEFAULT_VIDEO_MODE
#define CONFIG_SYS_DEFAULT_VIDEO_MODE    0x211
#endif

 #define RES_MODE_640x480 0

 #define RES_MODE_800x600 1

 #define RES_MODE_1024x768 2

 #define RES_MODE_960_720 3

 #define RES_MODE_1152x864 4

 #define RES_MODE_1280x1024 5

 #define RES_MODE_480x272 6  

 #define RES_MODES_COUNT 7  

#define VESA_MODES_COUNT        20    

    修改drivers/video/目录下的Makefile文件，增加smdk2440_lcd.c的编译选项，修改的代码如下：

COBJS-$(CONFIG_VIDEO_SMI_LYNXEM) += smiLynxEM.o
COBJS-$(CONFIG_VIDEO_VCXK) += bus_vcxk.o
COBJS-y += videomodes.o
COBJS-y += smdk2440_lcd.o

    

    显示LOGO的函数调用流程如下：

    在lib_arm/board.c中的start_armboot函数中调用common/stdio.c中的stdio_init

，如果定义了CONFIG_VIDEO或者CONFIG_CFB_CONSOLE，调用drivers/video/cfb_console.c中的drv_video_init函数，该函数中的video_init函数先调用smdk2440_lcd.c中的video_hw_init函数，接着video_logo调用logo_plot显示logo。

    现在在smdk2440.h文件中定义和LCD LOGO相关的宏，增加的代码如下：

#define CONFIG_CMD_BMP
#define CONFIG_CFB_CONSOLE
#define LCD_VIDEO_ADDR 0x33d00000
#define CONFIG_VIDEO
#define CONFIG_VIDEO_S3C2440  //定义了这个宏就可以编译smdk2440_lcd.c
#define CONFIG_VIDEO_LOGO

#define VIDEO_KBD_INIT_FCT 0
#define VIDEO_TSTC_FCT serial_tstc
#define VIDEO_GETC_FCT serial_getc

#define CONFIG_SYS_CONSOLE_IS_IN_ENV
#define VIDEO_FB_16BPP_WORD_SWAP //控制字体的显示模式，不然字体显示模糊

    重新编译u-boot，下载到NandFlash中运行，启动的过程中就会在屏幕左上角显示logo，是一个小企鹅图片。

显示自定义的图片logo

    如果又定义了宏VIDEO_BMP_LOGO，编译时会执行tools目录下的bmp_logo程序，读取"tools/logos/denx.bmp"文件，在include下生成bmp_logo.h文件，该文件的内容如下：

#define BMP_LOGO_WIDTH        160
#define BMP_LOGO_HEIGHT        96
#define BMP_LOGO_COLORS        31
#define BMP_LOGO_OFFSET        16

unsigned short bmp_logo_palette[] = {
....................................
}

 unsigned short bmp_logo_bitmap[] = {

....................................
}

   显示logo函数就会调用这个数组中的数据，显示到屏上。在cfb_console.c中定义了LOGO的属性，代码如下：

#ifdef    CONFIG_VIDEO_LOGO
#ifdef    CONFIG_VIDEO_BMP_LOGO
#include
#define VIDEO_LOGO_WIDTH    BMP_LOGO_WIDTH
#define VIDEO_LOGO_HEIGHT    BMP_LOGO_HEIGHT
#define VIDEO_LOGO_LUT_OFFSET    BMP_LOGO_OFFSET
#define VIDEO_LOGO_COLORS    BMP_LOGO_COLORS

    三星平台默认使用denx.bmp图片(在tools/logos/目录下）作为自定义的BMP logo，把自己的logo图片改成这个文件名，再编译就行了。这个bmp文件是有要求的，位深度必须为8位，大小也有限制（全屏图片肯定是不行的，读取文件的后半部数据都是0）。

   在smdk2440.h中增加宏VIDEO_BMP_LOGO，修改的代码如下：

#define CONFIG_VIDEO_S3C2440
#define CONFIG_VIDEO_LOGO
#define CONFIG_VIDEO_BMP_LOGO

   

   重新编译u-boot，下载到NandFlash中运行，启动的过程中就会在屏幕左上角显示自定义的logo。