你好，
我准备移植最新版本的u-boot,现在u-boot已经可以跑起来了，如log所示：
U-Boot 2015.04-14469-gd3ef2ab-dirty (Apr 21 2016 - 01:50:53)
CPU: Freescale i.MX6Q rev1.5 at 792 MHz
CPU: Temperature 24 C
Reset cause: POR
Board: MX6-SabreSD
I2C: ready
DRAM: 3.8 GiB
MMC: FSL_SDHC: 0, FSL_SDHC: 1, FSL_SDHC: 2, FSL_SDHC: 3
No panel detected: default to Hannstar-XGA
Display: Hannstar-XGA (1024x768)
In: serial
Out: serial
Err: serial
switch to partitions #0, OK
mmc0(part 0) is current device
Net: Phy 1 not found
PHY reset timed out
FEC [PRIME]
Normal Boot
Hit any key to stop autoboot: 0
=>
我现在想实现u-boot启动logo，我们的board使用的是samsung的LTM230HL08屏，这是屏的资料：【三星液晶屏LTM230HL08概况】-全球液晶屏交易中心-屏库
下面这个是借口的电路图：
现在我做的工作是在include/configs/mx6sabresd.h文件中：
94 #define CONFIG_SPLASH_SCREEN
95 #define CONFIG_CMD_BMP
96 #define CONFIG_LCD
97 /* #define CONFIG_MXC_EPDC */
98
99 /*
100 * SPLASH SCREEN Configs
101 */
102 #if defined(CONFIG_SPLASH_SCREEN) && defined(CONFIG_MXC_EPDC)
103 /*
104 * Framebuffer and LCD
105 */
106 #define CONFIG_CMD_BMP
107 #define CONFIG_LCD
108 #define CONFIG_SYS_CONSOLE_IS_IN_ENV
109 #undef LCD_TEST_PATTERN
110 /* #define CONFIG_SPLASH_IS_IN_MMC 1 */
111 #define LCD_BPP LCD_MONOCHROME
112 /* #define CONFIG_SPLASH_SCREEN_ALIGN 1 */
113
114 #define CONFIG_WAVEFORM_BUF_SIZE 0x200000
115 #endif /* CONFIG_SPLASH_SCREEN && CONFIG_MXC_EPDC */
116
117 #endif /* __MX6QSABRESD_CONFIG_H */
打开了上面红色部分的宏，我是不是我是不是要打开CONFIG_MXC_EPDC宏呢，这个宏是干什么的。是不是只用打开CONFIG_SPLASH_SCREEN宏就可以了呢？因为在board/freescale/mx6sabresd/mx6sabresd.c文件中发现有好的定义了这个：
#if defined(CONFIG_MX6DL) && defined(CONFIG_MXC_EPDC)
vidinfo_t panel_info = {
.....
....
#endif
等于说要同事定义CONFIG_MX6DL宏才能用panel_info。如果我定义了上面的：
94 #define CONFIG_SPLASH_SCREEN
95 #define CONFIG_CMD_BMP
96 #define CONFIG_LCD
在编译的时候又会出现错误：
LDS u-boot.lds
LD u-boot
common/built-in.o: In function `lcd_get_size':
/home/fulinux/uboot-imx/common/lcd.c:138: undefined reference to `panel_info'
common/built-in.o: In function `lcd_clear':
/home/fulinux/uboot-imx/common/lcd.c:175: undefined reference to `lcd_setcolreg'
/home/fulinux/uboot-imx/common/lcd.c:176: undefined reference to `lcd_setcolreg'
/home/fulinux/uboot-imx/common/lcd.c:177: undefined reference to `lcd_setcolreg'
/home/fulinux/uboot-imx/common/lcd.c:178: undefined reference to `lcd_setcolreg'
/home/fulinux/uboot-imx/common/lcd.c:179: undefined reference to `lcd_setcolreg'
common/built-in.o:/home/fulinux/uboot-imx/common/lcd.c:180: more undefined references to `lcd_setcolreg' follow
common/built-in.o: In function `lcd_clear':
/home/fulinux/uboot-imx/common/lcd.c:227: undefined reference to `panel_info'
common/built-in.o: In function `lcd_init':
/home/fulinux/uboot-imx/common/lcd.c:252: undefined reference to `lcd_ctrl_init'
/home/fulinux/uboot-imx/common/lcd.c:268: undefined reference to `lcd_enable'
common/built-in.o: In function `lcd_set_cmap':
/home/fulinux/uboot-imx/common/lcd.c:566: undefined reference to `panel_info'
common/built-in.o: In function `lcd_display_bitmap':
/home/fulinux/uboot-imx/common/lcd.c:717: undefined reference to `panel_info'
我很好奇，在
struct display_info_t const displays[] = {{
762 .bus = -1,
763 .addr = 0,
764 .pixfmt = IPU_PIX_FMT_RGB666,
765 .detect = NULL,
766 .enable = enable_lvds,
767 .mode = {
768 .name = "Hannstar-XGA",
769 .refresh = 60,
770 .xres = 1024,
771 .yres = 768,
772 .pixclock = 15385,
773 .left_margin = 220,
774 .right_margin = 40,
775 .upper_margin = 21,
776 .lower_margin = 7,
777 .hsync_len = 60,
778 .vsync_len = 10,
779 .sync = FB_SYNC_EXT,
780 .vmode = FB_VMODE_NONINTERLACED
781 } }, {
结构体中定义了这些项，还需要panel_info，以及lcd的初始化吗？
目前displays结构体我还没有修改，在内核中这个设置是不是可以参考一下：
linux/drivers/video/mxc/ldb.c：
static struct fb_videomode ldb_modedb[] = {
107 { "WXGA", 60, 1680, 1048, 6848,//6848
108 280, 104, //280, 104
109 30, 3, //30, 3
110 176, 6,//176,6
111 FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
112 FB_VMODE_NONINTERLACED,
113 FB_MODE_IS_DETAILED,},
114 {
115 "LDB-WXGA", 60, 1280, 800, 14065,
116 40, 40,
117 10, 3,
118 80, 10,
119 0,
120 FB_VMODE_NONINTERLACED,
121 FB_MODE_IS_DETAILED,},
122 {
123 "LDB-XGA", 60, 1024, 768, 15385,
。。。
我在board/freescale/mx6sabresd/mx6sabresd.c文件中发现了好的epdc关键字的函数，这个是什么，和我这个lvds屏有关系吗？
说的内容很乱，现在大脑也是很纠结。希望你们能提供一点指导下的建议和帮助，有没有什么参考下的文档呢。
期待你的回复。
