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

本文转载自：http://blog.csdn.net/kris_fei/article/details/76256224?locationNum=2&fps=1

版权声明：本文为博主原创文章，未经博主允许不得转载。

Platform: Rockchip 
OS: Android 6.0 
Kernel: 3.10.92

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 

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 %sn", 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%cn", 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 partitionn", __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 partitionn", __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, %dn", 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:%sn", image_path); lcd_display_bitmap_center((uint32_t)(unsigned long)image.load_addr); ret = true; } else { FBTERR("Failed to load image:%sn", image_path); } } #endif return ret; }

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参考： 
Rockchip uboot开发指南_V3.7