[RK3288][Android6.0] 关于uboot中logo相关知识点小结 _android6.0

青春须早为，岂能长少年。这篇文章主要讲述[RK3288][Android6.0] 关于uboot中logo相关知识点小结相关的知识，希望能为你提供帮助。
本文转载自：http://blog.csdn.net/kris_fei/article/details/76256224
Platform: Rockchip
OS: android 6.0
Kernel: 3.10.92
【[RK3288][Android6.0] 关于uboot中logo相关知识点小结】遇到不少网友找不到uboot logo在哪里，其实一开始我也潜意识地去u-boot目录下去找，但是后来发现是在kernel目录下

文章图片

加载顺序：
1.uboot开机的时候会先去logo分区加载
2.加载失败则尝试从resource分区加载
3.加载失败则尝试从boot分区加载
限制：
1. 只能显示偶数分辨率
2. 只能显示位深为8bit的bmp图片
3. 输入是24bit图片
制作：
#convert -compress rle -colors 256 src.bmp logo.bmp
编译：
替换编译后是在resource.img或者boot.img(包含Resource.img的情况)中
代码调用：

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; }