uboot启动时如何默认选择LCD屏幕显示

最新推荐文章于 2025-04-28 10:12:16 发布

电鱼电子

最新推荐文章于 2025-04-28 10:12:16 发布

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本文链接：https://blog.youkuaiyun.com/weixin_45152565/article/details/102836897

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本文介绍如何在UBoot启动时默认选择LCD屏幕显示，具体操作涉及修改board/freescale/mx6sabresd/mx6sabresd.c文件，通过调整displays数组的内容和display_count变量，以适应SAIL-IMX6Q平台。

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   有时候启动了uboot却不能默认选择LCD屏幕显示真的是太烦人了啊，所以给大家编出一套代码让大家方便学习会uboot启动时如何默认选择LCD屏幕显示！！！下面这些是我是我用电鱼电子SAIL-AM335X实现的步骤。

修改/uboot/board/freescale/mx6sabresd/mx6sabresd.c文件，如图所示：
修改如下部分：

struct display_info_t const displays[] = {{

   .bus = -1,

   .addr      = 0,

   .pixfmt    = IPU_PIX_FMT_RGB24,

   .detect    = NULL,

   .enable   = enable_lvds,

   .mode     = {

          .name           = "Hannstar-XGA",

          .refresh        = 60,

          .xres           = 1920,

          .yres           = 1080,

          .pixclock       = 6734,

          .left_margin    = 90,

          .right_margin   = 50,

          .upper_margin   = 30,

          .lower_margin   = 6,

          .hsync_len      = 24,

          .vsync_len      = 3,

          .sync           = FB_SYNC_EXT,

          .vmode          = FB_VMODE_NONINTERLACED

} }, {

   .bus = -1,

   .addr      = 0,

   .pixfmt    = IPU_PIX_FMT_RGB24,

   .detect    = NULL,

   .enable   = do_enable_hdmi,

   .mode     = {

          .name           = "HDMI",

          .refresh        = 60,

          .xres           = 640,

          .yres           = 480,

          .pixclock       = 39721,

          .left_margin    = 48,

          .right_margin   = 16,

          .upper_margin   = 33,

          .lower_margin   = 10,

          .hsync_len      = 96,

          .vsync_len      = 2,

          .sync           = 0,

          .vmode          = FB_VMODE_NONINTERLACED

} }, {

   .bus = 0,

   .addr      = 0,

   .pixfmt    = IPU_PIX_FMT_RGB24,

   .detect    = NULL,

   .enable   = enable_rgb,

   .mode     = {

          .name           = "SEIKO-WVGA",

          .refresh        = 60,

          .xres           = 800,

          .yres           = 480,

          .pixclock       = 29850,

          .left_margin    = 89,

          .right_margin   = 164,

          .upper_margin   = 23,

          .lower_margin   = 10,

          .hsync_len      = 10,

          .vsync_len      = 10,

          .sync           = 0,

          .vmode          = FB_VMODE_NONINTERLACED

} } };

size_t display_count =
ARRAY_SIZE(displays);

修改完成后如下所示：

struct display_info_t const displays[] = {{

   .bus = 0,

   .addr      = 0,

   .pixfmt    = IPU_PIX_FMT_RGB24,

   .detect    = NULL,

   .enable   = enable_rgb,

   .mode     = {

          .name           = "CLAA-WVGA",

          .refresh        = 57,

          .xres           = 800,

          .yres           = 480,

          .pixclock       = 37037,

          .left_margin    = 40,

          .right_margin   = 60,

          .upper_margin   = 10,

          .lower_margin   = 10,

          .hsync_len      = 20,

          .vsync_len      = 10,

          .sync           = 0,

          .vmode          = FB_VMODE_NONINTERLACED

} },{

   .bus = -1,

   .addr      = 0,

   .pixfmt    = IPU_PIX_FMT_RGB666,

   .detect    = NULL,

   .enable   = enable_lvds,

   .mode     = {

          .name           = "Hannstar-XGA",

          .refresh        = 60,

          .xres           = 1024,

          .yres           = 768,

          .pixclock       = 15385,

          .left_margin    = 220,

          .right_margin   = 40,

          .upper_margin   = 21,

          .lower_margin   = 7,

          .hsync_len      = 60,

          .vsync_len      = 10,

          .sync           = FB_SYNC_EXT,

          .vmode          = FB_VMODE_NONINTERLACED

} }, {

   .bus = -1,

   .addr      = 0,

   .pixfmt    = IPU_PIX_FMT_RGB24,

   .detect    = NULL,

   .enable   = do_enable_hdmi,

   .mode     = {

          .name           = "HDMI",

          .refresh        = 60,

          .xres           = 640,

          .yres           = 480,

          .pixclock       = 39721,

          .left_margin    = 48,

          .right_margin   = 16,

          .upper_margin   = 33,

          .lower_margin   = 10,

          .hsync_len      = 96,

          .vsync_len      = 2,

          .sync           = 0,

          .vmode          = FB_VMODE_NONINTERLACED

} } };

size_t display_count =
ARRAY_SIZE(displays);
以上的这些都是基于SAIL-IMX6Q所完成的。