请教下正点原子修改后的uboot，LCD不显示，如何打开LCD

yufuxing

文档中说正点原子修改后的Ｕｂｏｏｔ　将ＬＣＤ关闭了，需要使用应该怎么打开呢？阿尔法的开发板，看到程序中对很多尺寸屏幕做了适配，目前编译下载完后ＬＣＤ　没有显示。请教下应该如何打开正点原子修改后的ＵＢＯＯＴ中的ＬＣＤ。谢谢！

茂茂2019

1. Date: Fri, 5 Nov 2021 17:43:52 +0800
   
2. Subject: [PATCH] ATK-IMX6ULL: disable lcd
   
3. 
   
4. ---
   
5. arch/arm/imx-common/video.c           | 2 +-
   
6. board/freescale/mx6ullevk/mx6ullevk.c | 8 ++++++++
   
7. include/configs/mx6ullevk.h           | 6 +++---
   
8. 3 files changed, 12 insertions(+), 4 deletions(-)
   
9. 
   
10. diff --git a/arch/arm/imx-common/video.c b/arch/arm/imx-common/video.c
    
11. index 505f683..6033110 100644
    
12. --- a/arch/arm/imx-common/video.c
    
13. +++ b/arch/arm/imx-common/video.c
    
14. @@ -17,7 +17,7 @@ int board_video_skip(void)
    
15.         char const *panel;
    
16. 
    
17.         /* Select LCD configuration based on current hardware ID */
    
18. -        select_display_dev();
    
19. +        /* select_display_dev(); */
    
20. 
    
21.         panel = getenv("panel");
    
22.         if (!panel) {
    
23. diff --git a/board/freescale/mx6ullevk/mx6ullevk.c b/board/freescale/mx6ullevk/mx6ullevk.c
    
24. index 251c2ee..24eff87 100644
    
25. --- a/board/freescale/mx6ullevk/mx6ullevk.c
    
26. +++ b/board/freescale/mx6ullevk/mx6ullevk.c
    
27. @@ -927,8 +927,14 @@ struct display_info_t const displays[] = {
    
28. size_t display_count = ARRAY_SIZE(displays);
    
29. #endif
    
30. 
    
31. +static iomux_v3_cfg_t const lcd_backlight_pads[] = {
    
32. +        MX6_PAD_GPIO1_IO08__GPIO1_IO08 | MUX_PAD_CTRL(NO_PAD_CTRL),
    
33. +};
    
34. +
    
35. int board_early_init_f(void)
    
36. {
    
37. +        imx_iomux_v3_setup_multiple_pads(lcd_backlight_pads, ARRAY_SIZE(lcd_backlight_pads));
    
38. +        gpio_direction_output(IMX_GPIO_NR(1, 8) , 0);
    
39.         setup_iomux_uart();
    
40. 
    
41.         return 0;
    
42. @@ -1166,6 +1172,8 @@ int board_late_init(void)
    
43. 
    
44.         set_wdog_reset((struct wdog_regs *)WDOG1_BASE_ADDR);
    
45. 
    
46. +        select_display_dev();
    
47. +
    
48.         return 0;
    
49. }
    
50. 
    
51. diff --git a/include/configs/mx6ullevk.h b/include/configs/mx6ullevk.h
    
52. index d44ea37..d52a985 100644
    
53. --- a/include/configs/mx6ullevk.h
    
54. +++ b/include/configs/mx6ullevk.h
    
55. @@ -358,8 +358,8 @@
    
56. 
    
57. #define CONFIG_IMX_THERMAL
    
58. 
    
59. -#ifndef CONFIG_SPL_BUILD
    
60. -#define CONFIG_VIDEO
    
61. +/*#ifndef CONFIG_SPL_BUILD
    
62. +#define CONFIG_VIDEO*/
    
63. #ifdef CONFIG_VIDEO
    
64. #define CONFIG_CFB_CONSOLE
    
65. #define CONFIG_VIDEO_MXS
    
66. @@ -374,7 +374,7 @@
    
67. #define CONFIG_VIDEO_BMP_RLE8
    
68. #define CONFIG_VIDEO_BMP_LOGO
    
69. #define CONFIG_IMX_VIDEO_SKIP
    
70. -#endif
    
71. +/*#endif*/
    
72. #endif
    
73. 
    
74. #define CONFIG_IOMUX_LPSR
    
75. --
    
76. 1.9.1
    

复制代码

上面是禁用lcd的步骤，你改回去就行了。同时还要打开uboot logo在include/configs/mx6ullevk.h头文件下开启define CONFIG_VIDEO_LOGO。