本文转载自：http://blog.csdn.net/u010865783/article/details/54953315
在lcd为竖屏，hdmi显示横屏的情况下，如果按照默认的uboot显示框架来看，只能保证lcd或者hdmi上面显示出来的图片一个是正的，另外一个是旋转了90度的样子。
为了能是lcd和hdmi同时支持显示图片都是正的，需要对uboot的框架做修改。如果硬件支持旋转功能的话，就可直接使用硬件旋转，不需要软件来调整。
由于项目原因，折腾了一把这个流程，具体实现记录下：
1：由于硬件不支持rotation功能，在软件上采用的方法是准备两份logo资源，解析后将两份数据送到不同的显示设备上面做显示。
在解析logo的时候需要解析两份资源：
static int splash_image_load(void)
{
int ret;
char *filename,*filename_hdmi;
void *splash_image_addr,*splash_image_hdmi_addr;
char splash_image_char[16], splash_image_hdmi_char[16];
//分配给lcd资源的地址
splash_image_addr = memalign(128, CONFIG_SYS_VIDEO_LOGO_MAX_SIZE);
if(splash_image_addr == NULL) {
printk("Malloc size for splash image failed!
");
return -1;
}
//分配给hdmi资源logo的地址
splash_image_hdmi_addr = memalign(128, CONFIG_SYS_VIDEO_LOGO_MAX_SIZE);
if(splash_image_hdmi_addr == NULL) {
printk("Malloc size for splash image hdmi failed!
");
return -1;
}
filename = splash_image_select();
filename_hdmi = CONFIG_SYS_VIDEO_LOGO_HDMI_NAME;
if (!filename) {
printk("No splash image loaded
");
return -1;
}
//拿到lcd的logo
ret = file_fat_read(filename, splash_image_addr, CONFIG_SYS_VIDEO_LOGO_MAX_SIZE);
if(ret < 0) {
printk("Fail to load splash image
");
free(splash_image_addr);
return -1;
}
//拿到hdmi的logo
ret = file_fat_read(filename_hdmi, splash_image_hdmi_addr, CONFIG_SYS_VIDEO_LOGO_MAX_SIZE);
if(ret < 0) {
printk("Fail to load splash hdmi image
");
free(splash_image_hdmi_addr);
return -1;
}
sprintf(splash_image_char, "%x", (unsigned int) splash_image_addr);
sprintf(splash_image_hdmi_char, "%x", (unsigned int) splash_image_hdmi_addr);
//将解析到的地址保存到env中，后续需要再读取出来
setenv("splashimage", splash_image_char);
setenv("splashimagehdmi", splash_image_hdmi_char);
return 0;
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2：添加对hdmi驱动中的支持和在cfb_console.c中添加解析图片的支持
static int video_init(void)
{
unsigned char color8;
pGD = video_hw_init();
if (pGD == NULL)
return -1;
//获取驱动中的hdmi的fb的信息video_hw_hdmi_init在fb的驱动中实现
pGD_HDMI = video_hw_hdmi_init();
if (pGD_HDMI == NULL)
return -1;
...
}
static void *video_logo(void)
{
char info[128];
int space, len;
__maybe_unused int y_off = 0;
__maybe_unused ulong addr;
__maybe_unused char *s,*s_hdmi;
splash_get_pos(&video_logo_xpos, &video_logo_ypos);
//splash_get_pos(&video_logo_xpos, &video_logo_ypos);
video_hdmi_logo_xpos = BMP_ALIGN_CENTER; //init xpos and ypos
video_hdmi_logo_ypos = BMP_ALIGN_CENTER;
#ifdef CONFIG_SPLASH_SCREEN
//从env中拿到lcd和hdmi图片的地址
s = getenv("splashimage");
s_hdmi = getenv("splashimagehdmi");
if (s != NULL) {
splash_screen_prepare();
addr = simple_strtoul(s, NULL, 16);
//解析lcd的logo资源成送显的数据
if (video_display_bitmap(addr,
video_logo_xpos,
video_logo_ypos) == 0) {
video_logo_height = 0;
//return ((void *) (video_fb_address));
}
}
if (s_hdmi != NULL) {
//printf("xieshsh debug video display
");
splash_screen_prepare();
addr = simple_strtoul(s_hdmi, NULL, 16);
//解析lcd的hdmi资源成送显的数据
if (video_display_hdmi_bitmap(addr,
video_hdmi_logo_xpos,
video_hdmi_logo_ypos) == 0) {
video_hdmi_logo_ypos = 0;
return ((void *) (video_fb_address));
}
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3：接下来需要对添加对hdmi logo的解析成fb的数据
int video_display_hdmi_bitmap(ulong bmp_image, int x, int y)
{
ushort xcount, ycount;
uchar *fb;
bmp_image_t *bmp = (bmp_image_t *) bmp_image;
uchar *bmap;
ushort padded_line;
unsigned long width, height, bpp;
unsigned colors;
unsigned long compression;
bmp_color_table_entry_t cte;
#ifdef CONFIG_VIDEO_BMP_GZIP
unsigned char *dst = NULL;
ulong len;
#endif
WATCHDOG_RESET();
if (!((bmp->header.signature[0] == 'B') &&
(bmp->header.signature[1] == 'M'))) {
#ifdef CONFIG_VIDEO_BMP_GZIP
/*
* Could be a gzipped bmp image, try to decrompress...
*/
len = CONFIG_SYS_VIDEO_LOGO_MAX_SIZE;
dst = malloc(CONFIG_SYS_VIDEO_LOGO_MAX_SIZE);
if (dst == NULL) {
printf("Error: malloc in gunzip failed!
");
return 1;
}
/*
* NB: we need to force offset of +2
* See doc/README.displaying-bmps
*/
if (gunzip(dst+2, CONFIG_SYS_VIDEO_LOGO_MAX_SIZE-2,
(uchar *) bmp_image,
&len) != 0) {
printf("Error: no valid bmp or bmp.gz image at %lx
",
bmp_image);
free(dst);
return 1;
}
if (len == CONFIG_SYS_VIDEO_LOGO_MAX_SIZE) {
printf("Image could be truncated "
"(increase CONFIG_SYS_VIDEO_LOGO_MAX_SIZE)!
");
}
/*
* Set addr to decompressed image
*/
bmp = (bmp_image_t *)(dst+2);
if (!((bmp->header.signature[0] == 'B') &&
(bmp->header.signature[1] == 'M'))) {
printf("Error: no valid bmp.gz image at %lx
",
bmp_image);
free(dst);
return 1;
}
#else
printf("Error: no valid bmp image at %lx
", bmp_image);
return 1;
#endif /* CONFIG_VIDEO_BMP_GZIP */
}
width = le32_to_cpu(bmp->header.width);
height = le32_to_cpu(bmp->header.height);
bpp = le16_to_cpu(bmp->header.bit_count);
colors = le32_to_cpu(bmp->header.colors_used);
compression = le32_to_cpu(bmp->header.compression);
debug("Display-bmp: %ld x %ld with %d colors
",
width, height, colors);
if (compression != BMP_BI_RGB
#ifdef CONFIG_VIDEO_BMP_RLE8
&& compression != BMP_BI_RLE8
#endif
) {
printf("Error: compression type %ld not supported
",
compression);
#ifdef CONFIG_VIDEO_BMP_GZIP
if (dst)
free(dst);
#endif
return 1;
}
padded_line = (((width * bpp + 7) / 8) + 3) & ~0x3;
#ifdef CONFIG_SPLASH_SCREEN_ALIGN
if (x == BMP_ALIGN_CENTER){
x = max(0, (int)(VIDEO_HDMI_VISIBLE_COLS - width) / 2);
printf("VVVVVVVVx=%d",x);
}
else if (x < 0)
x = max(0, (int)(VIDEO_HDMI_VISIBLE_COLS - width + x + 1));
if (y == BMP_ALIGN_CENTER)
y = max(0, (int)(VIDEO_HDMI_VISIBLE_ROWS - height) / 2);
else if (y < 0)
y = max(0, (int)(VIDEO_HDMI_VISIBLE_ROWS - height + y + 1));
#endif /* CONFIG_SPLASH_SCREEN_ALIGN */
/*
* Just ignore elements which are completely beyond screen
* dimensions.
*/
if ((x >= VIDEO_HDMI_VISIBLE_COLS) || (y >= VIDEO_HDMI_VISIBLE_ROWS))
return 0;
if ((x + width) > VIDEO_HDMI_VISIBLE_COLS)
width = VIDEO_HDMI_VISIBLE_COLS - x;
if ((y + height) > VIDEO_HDMI_VISIBLE_ROWS)
height = VIDEO_HDMI_VISIBLE_ROWS - y;
bmap = (uchar *) bmp + le32_to_cpu(bmp->header.data_offset);
fb = (uchar *) (video_hdmi_fb_address +
((y + height - 1) * VIDEO_HDMI_VISIBLE_COLS * VIDEO_HDMI_PIXEL_SIZE) +
x * VIDEO_HDMI_PIXEL_SIZE);
/* We handle only 4, 8, or 24 bpp bitmaps */
switch (le16_to_cpu(bmp->header.bit_count)) {
case 24:
padded_line -= 3 * width;
ycount = height;
//printf("xiessh----VIDEO_DATA_FORMAT = %d
",VIDEO_HDMI_DATA_FORMAT);
switch (VIDEO_HDMI_DATA_FORMAT) {
case GDF_32BIT_X888RGB:
while (ycount--) {
WATCHDOG_RESET();
xcount = width;
while (xcount--) {
FILL_32BIT_X888RGB(bmap[2], bmap[1],
bmap[0]);
bmap += 3;
}
bmap += padded_line;
fb -= (VIDEO_HDMI_VISIBLE_COLS + width) *
VIDEO_PIXEL_SIZE;
}
break;
default:
printf("Error: 24 bits/pixel bitmap incompatible "
"with current video mode
");
break;
}
break;
default:
printf("Error: %d bit/pixel bitmaps not supported by U-Boot
",
le16_to_cpu(bmp->header.bit_count));
break;
}
#ifdef CONFIG_VIDEO_BMP_GZIP
if (dst) {
free(dst);
}
#endif
if (cfb_do_flush_cache)
flush_cache(VIDEO_FB_ADRS, VIDEO_SIZE);
return (0);
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实现了上面的内容之后，接下来需要在uboot的fb中做好映射，主要是将fb0对应的logo的资源送到lcd、fb1对应的logo资源送到hdmi显示，具体的代码和平台相关。
这样造成的影响是会使uboot阶段显示的内存增加一倍，之前只用了一个图片，现在用到了两个图片，所以内存会增加一倍。
当android系统起来的时候，因为lcd是竖屏，lcd上面的内容旋转了90度当成了横屏模式在使用，hdmi是横屏，会造成android动画的前半段在hdmi上面显示的android字样变成了垂直显示，知道android的display的java服务启动之后，android的显示系统识别到了hdmi设备，系统才显示正常。
对于这种情况，hdmi的前半段的异常显示，由于硬件无法rotation，只能采取一个规避的方式解决，将开机启动的logo一直保存到android上层的显示系统识别到hdmi后，才释放boot logo的资源，在这个之前，一直都显示logo的图片。具体的实现方式和平台相关，代码就不贴了。