在u-boot (i.MX8M Mini)中集成sitronix-st7701 MIPI-DSI，无法从u-boot看到任何显示的原因？

优盘：优盘 2020.04-5.4.47-2.2.0
内核：5.4.47（NXP i.MX Release Distro 5.4-zeus）

我正在使用带有上述内核的 i.MX8M Mini 和带有 Yocto 的 u-boot 版本。我的 LCD（带有 ST7701S 控制器）在内核中按预期工作。
现在，我想从 u-boot 中使用它。为此，我按照以下步骤操作：

• 修改u-boot中的“​​raydium-rm67191.c”文件（更改命令顺序，显示时间根据我的显示）
• 添加启动徽标添加到 Env 文件
• 在dts文件中启用显示
  

我的驱动程序探测成功。但是，我无法从 u-boot 看到任何显示。日志如下。
-Video Link 0DEBUG : drivers/video/raydium-rm67191.c, rm67191_panel_probe, 534
DEBUG : drivers/video/raydium-rm67191.c, rm67191_panel_probe, success, 587
DEBUG : drivers/video/raydium-rm67191.c, rm67191_panel_get_display_timing, Entry, 511
DEBUG : drivers/video/raydium-rm67191.c, rm67191_panel_get_display_timing, Exit, 525
DEBUG : drivers/video/raydium-rm67191.c, rm67191_panel_get_display_timing, Entry, 511
DEBUG : drivers/video/raydium-rm67191.c, rm67191_panel_get_display_timing, Exit, 525
DEBUG : drivers/video/raydium-rm67191.c, rm67191_panel_enable_backlight, 499
DEBUG : drivers/video/raydium-rm67191.c, rm67191_panel_enable_backlight, 504
DEBUG : drivers/video/raydium-rm67191.c, rm67191_enable, 404
DEBUG : drivers/video/raydium-rm67191.c, rad_panel_push_cmd_list, 371
DEBUG : drivers/video/raydium-rm67191.c, rad_panel_push_cmd_list, 390
DEBUG : drivers/video/raydium-rm67191.c, rm67191_enable, 489
(480 x 480)
        [0] lcdif@32e00000, video
        [1] mipi_dsi@32e10000, video_bridge
        [2] rm67191_panel, panel
DEBUG : common/splash.c, splash_display, 168
DEBUG : common/splash.c, splash_display, 173, Screen add : 0x50000000
DEBUG : common/splash.c, splash_screen_prepare, 88
DEBUG : common/splash.c, splash_screen_prepare, 93
DEBUG : common/splash.c, splash_video_logo_load, 64
DEBUG : common/splash.c, splash_video_logo_load, 69, Splashimage : 0x50000000
DEBUG : common/splash.c, splash_video_logo_load, 76
DEBUG : common/splash.c, splash_display, 181
DEBUG : cmd/bmp.c, bmp_display, 245
DEBUG : cmd/bmp.c, bmp_display, 285, Ret : 0
DEBUG : common/splash.c, splash_display, 189
DEBUG : common/splash.c, splash_display_banner, 135
DEBUG : common/splash.c, splash_display_banner, 148
DEBUG : lib/display_options.c, display_options_get_banner_priv, 19
DEBUG : lib/display_options.c, display_options_get_banner_priv, 25, len : 70
DEBUG : lib/display_options.c, display_options_get_banner_priv, 32
In:    serial