[RK3288][Android6.0] 關於uboot中logo相關知識點小結【轉】

標籤：and   載入失敗   process   name   kernel   char   小結   for   android   

本文轉載自：http://blog.csdn.net/kris_fei/article/details/76256224

Platform: Rockchip 
OS: Android 6.0 
Kernel: 3.10.92

遇到不少網友找不到uboot logo在哪裡，其實一開始我也潛意識地去u-boot目錄下去找，但是後來發現是在kernel目錄下 

載入順序： 
1.uboot開機的時候會先去logo分區載入 
2.載入失敗則嘗試從resource分區載入 
3.載入失敗則嘗試從boot分區載入

限制： 
1. 只能顯示偶數解析度 
2. 只能顯示位深為8bit的bmp圖片 
3. 輸入是24bit圖片

製作： 
#convert -compress rle -colors 256 src.bmp logo.bmp

編譯： 
替換編譯後是在resource.img或者boot.img(包含Resource.img的情況)中

代碼調用：

int rk_bitmap_from_resource(unsigned short* fb) {    const char* file_path = "logo.bmp";    return show_resource_image(file_path) ? 0 : -1;}bool show_resource_image(const char* image_path) {    bool ret = false;#ifdef CONFIG_LCD    bmp_image_t *bmp = NULL;    const disk_partition_t* ptn = get_disk_partition(LOGO_NAME);    resource_content image;    memset(&image, 0, sizeof(image));    snprintf(image.path, sizeof(image.path), "%s", image_path);    if (ptn) {        printf("Find logo from partition %s\n", LOGO_NAME);#ifdef CONFIG_DIRECT_LOGO        bmp = lcd_get_buffer();#else        bmp = (void *)gd->arch.rk_boot_buf_addr;#endif        read_storage(ptn->start, bmp, CONFIG_MAX_BMP_BLOCKS);        debug("bmp image at 0x%p, sign:%c%c\n", bmp, bmp->header.signature[0], bmp->header.signature[1]);    }    if (ptn && bmp && bmp->header.signature[0] == ‘B‘ && bmp->header.signature[1] == ‘M‘) {        debug("%s:show logo.bmp from logo partition\n", __func__);        lcd_display_bitmap_center((uint32_t)(unsigned long)bmp);        ret = true;    } else {        if (get_content(0, &image)) {            debug("%s:show logo from resource or boot partition\n", __func__);            int blocks = (image.content_size + BLOCK_SIZE - 1) / BLOCK_SIZE;            if (image.content_size > CONFIG_RK_BOOT_BUFFER_SIZE) {                FBTERR("Failed to bmp image too large, %d\n",                       image.content_size);                return false;            }#ifdef CONFIG_DIRECT_LOGO            image.load_addr = lcd_get_buffer();#else            image.load_addr = (void *)gd->arch.rk_boot_buf_addr;#endif            if (!load_content_data(&image, 0, image.load_addr, blocks)) {                return false;            }            FBTDBG("Try to show:%s\n", image_path);            lcd_display_bitmap_center((uint32_t)(unsigned long)image.load_addr);            ret = true;        } else {            FBTERR("Failed to load image:%s\n", image_path);        }    }#endif    return ret;}

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參考： 
Rockchip uboot開發指南_V3.7

[RK3288][Android6.0] 關於uboot中logo相關知識點小結【轉】