AM5728: uboot使用HDMI显示logo问题请教

移植Kernel上的HDMI驱动，目前已可以点亮屏幕，但是只能显示背景，无法显示图片信息，请问这个可能是什么问题呢？谢谢

移植中参考的代码：

\\ kernel
drivers\gpu\drm\omapdrm\displays
drivers\gpu\drm\omapdrm\dss
\\ uboot
uboot\drivers\video\am57xx-fb.c
uboot\drivers\video\omap3_dss.c
uboot\cmd\bmp.c
uboot\common\lcd.c

使用VIDEO1时屏幕显示：背景颜色

配置信息：

#define FB_BASE_ADDR			0x85000000 // 显存地址
// 使用通道
OMAP_DSS_VIDEO1
OMAP_DSS_CHANNEL_DIGIT

使用GFX时，屏幕显示：花屏

bmp部分代码：

int video_display_bitmap(ulong bmp_image, int x, int y)
{
	int lcd_line_length;
	ushort *cmap_base = NULL;
	ushort i, j;
	uchar *fb;
	struct bmp_image *bmp = (struct bmp_image *)map_sysmem(bmp_image, 0);
	uchar *bmap;
	ushort padded_width;
	unsigned long width, height, byte_width;
	unsigned long pwidth = VIDEO_COLS;
	unsigned colors, bpix, bmp_bpix;
	int hdr_size;
	struct bmp_color_table_entry *palette = bmp->color_table;

	if (!bmp || !(bmp->header.signature[0] == 'B' &&
		bmp->header.signature[1] == 'M')) {
		printf("Error: no valid bmp image at %lx\n", bmp_image);

		return 1;
	}

	lcd_get_size(&lcd_line_length);

	width = get_unaligned_le32(&bmp->header.width);
	height = get_unaligned_le32(&bmp->header.height);
	bmp_bpix = get_unaligned_le16(&bmp->header.bit_count);
	hdr_size = get_unaligned_le16(&bmp->header.size);
	zDebug2("hdr_size=%d, bmp_bpix=%d\n", hdr_size, bmp_bpix);

	colors = 1 << bmp_bpix;

	bpix = NBITS(VIDEO_PIXEL_SIZE);

	if (bpix != 1 && bpix != 8 && bpix != 16 && bpix != 32) 
	{
		printf ("Error: %d bit/pixel mode, but BMP has %d bit/pixel\n",
			bpix, bmp_bpix);

		return 1;
	}

	/*
	 * We support displaying 8bpp BMPs on 16bpp LCDs
	 * and displaying 24bpp BMPs on 32bpp LCDs
	 * */
	if (bpix != bmp_bpix &&
	    !(bmp_bpix == 8 && bpix == 16) &&
	    !(bmp_bpix == 24 && bpix == 32)) 
	{
		printf ("Error: %d bit/pixel mode, but BMP has %d bit/pixel\n",
			bpix, get_unaligned_le16(&bmp->header.bit_count));
		return 1;
	}

	printf("Display-bmp: %d x %d  with %d colors, display %d\n",
	      (int)width, (int)height, (int)colors, 1 << bpix);

	// if (bmp_bpix == 8)
	// 	lcd_set_cmap(bmp, colors);

	padded_width = (width & 0x3 ? (width & ~0x3) + 4 : width);

	if ((x + width) > pwidth)
		width = pwidth - x;
	if ((y + height) > VIDEO_ROWS)
		height = VIDEO_ROWS - y;

	bmap = (uchar *)bmp + get_unaligned_le32(&bmp->header.data_offset);
	fb   = (uchar *)(video_fb_address +
		(y + height - 1) * VIDEO_LINE_LEN + x * bpix / 8);

	switch (bmp_bpix) {
	case 1:
	case 8:
		printf("bmp 8 bit is not support\n");
		break;
#if defined(CONFIG_BMP_16BPP)
	case 16:
		for (i = 0; i < height; ++i) {
			WATCHDOG_RESET();
			for (j = 0; j < width; j++)
				fb_put_word(&fb, &bmap);

			bmap += (padded_width - width) * 2;
			fb -= width * 2 + lcd_line_length;
		}
		break;
#endif /* CONFIG_BMP_16BPP */
#if defined(CONFIG_BMP_24BMP)
	case 24:
		for (i = 0; i < height; ++i) {
			for (j = 0; j < width; j++) {
				*(fb++) = *(bmap++);
				*(fb++) = *(bmap++);
				*(fb++) = *(bmap++);
				*(fb++) = 0;
			}
			fb -= lcd_line_length + width * (bpix / 8);
		}
		break;
#endif /* CONFIG_BMP_24BMP */
#if defined(CONFIG_BMP_32BPP)
	case 32:
		for (i = 0; i < height; ++i) {
			for (j = 0; j < width; j++) {
				*(fb++) = *(bmap++);
				*(fb++) = *(bmap++);
				*(fb++) = *(bmap++);
				*(fb++) = *(bmap++);
			}
			fb -= lcd_line_length + width * (bpix / 8);
		}
		break;
#endif /* CONFIG_BMP_32BPP */
	default:
		break;
	};

	flush_dcache_range(VIDEO_FB_ADRS, VIDEO_SIZE);
	
	return 0;
}