本文转载自:http://blog.csdn.net/kris_fei/article/details/76256224
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 %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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参考:
Rockchip uboot开发指南_V3.7