uboot启动时如何默认选择LCD屏幕显示

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。