1920x720支持mxc_edid.c，嵌入式Linux
我正在使用带有Apalis Imx6的嵌入式Linux板，使用分辨率为1920x720p的屏幕。
我的设备支持其他决议，但没有提到一个，我要求支持，下面是我得到的答案。
您需要编辑"fb_videomode mxc_cea_mode64“构造函数。您可能需要引用Monitor数据表将刷新速率、分辨率等输入到文件中。
4.9-2.3.x-imx
我有监视器数据表和所有东西，我的监视器也支持所需的分辨率。
我只需要知道如何编辑和保存mxc_edid.c，然后重新编译内核以使屏幕正常工作。
任何帮助都很感激。
谢谢..
回答 1
Stack Overflow用户
发布于 2019-09-25 20:30:40
在Toradex模块上重新编译Linux内核的一般指导原则在Toradex 开发者网站：从源代码构建U和Linux内核的以下文章中进行了描述
首先，必须安装交叉编译工具链，如从源代码-工具链构建U-Boot和Linux内核中所述。
具体到用例，您必须从iMX6克隆表中提供的正确的从源代码-源代码-基于i.MX 6的模块构建U和Linux内核(Apalis/Colibri iMX6)内核分支。从您在问题中提供的链接来看，它似乎是toradex_4.9-2.3.x-imx。然后，要获得内核源代码，请遵循从源代码-内核源构建U和Linux内核
之后，您必须使用iMX6配置Apalis apalis_imx6_defconfig的内核，如从源代码-内核配置构建U-Boot和Linux内核-基于i.MX 6的模块中所述
现在是对源代码文件驱动程序/视频/fbdev/mxc/mxc_edid.c进行更改的时候了。
在您完成之后，是时候对内核进行比较了，这在从源代码-内核编译构建U和Linux内核-基于i.MX 6的内核(Apalis/Colibri iMX6)中有描述。您还可能需要重新编译从源代码构建U和Linux内核-内核模块编译，所有模块中描述的内核模块。
最后，按照从源代码-内核更新构建U-Boot和Linux内核中的描述，将内核更新到板上。
迭代edit source code的过程--> re-build the kernel --> re-deploy the kernel --> test changes，直到你把它钉牢为止。
或者，也可能更容易，您可以编辑设备树，而不是添加显示配置。
它的主要参考资料是设备树定制。基本上，设备树源与内核源代码一起提供，从源代码构建U和Linux内核还提供了如何编译设备树的信息。
下面是突出显示相关更改的代码片段：
timing_wide: 1920x720 {
+ clock-frequency = <104600000>;
+ hactive = <1920>;
+ vactive = <720>;
+ hback-porch = <24>;
+ hfront-porch = <24>;
+ vback-porch = <8>;
+ vfront-porch = <57>;
+ hsync-len = <32>;
+ vsync-len = <5>;
+ hsync-active = <0>;
+ vsync-active = <0>;
+ pixelclk-active = <0>;
+ };一旦您调整它以适应您的显示，构建并部署到设备上，如从源代码构建U和Linux内核中所记录的。
一旦将设备树部署到模块，您只需在U中设置正确的vidargs：
env set vidargs video=mxcfb0:dev=ldb,1920x720M@60,if=RGB666 ldb=sin0 fbmem=32M
env save
reset注意，不需要来重建U。您必须可以通过以下方式访问模块终端：
1)调试UART，即串行控制台；2)连接到模块上的监视器和USB键盘。
在重新启动或动力循环时，您必须按任意键(如果使用1来自计算机中的串行终端仿真器应用程序)，如果使用2则直接按在模块上)以访问reboot环境，在其中执行上述命令。
有关设备树自定义的参考，下面是支持自定义LVDS显示的相关设备树文件的差异(这不是您的显示，但可以用作示例)：
diff --git a/arch/arm/boot/dts/imx6qdl-apalis.dtsi b/arch/arm/boot/dts/imx6qdl-apalis.dtsi
index cfaaa571c158..b3c92314367b 100644
--- a/arch/arm/boot/dts/imx6qdl-apalis.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-apalis.dtsi
@@ -89,8 +89,8 @@
mxcfb1: fb@0 {
compatible = "fsl,mxc_sdc_fb";
disp_dev = "ldb";
- interface_pix_fmt = "RGB666";
- default_bpp = <16>;
+ interface_pix_fmt = "RGB24";
+ default_bpp = <24>;
int_clk = <0>;
late_init = <0>;
status = "disabled";
@@ -507,123 +507,135 @@
};
&ldb {
- status = "okay";
-// split-mode;
-// dual-mode;
-
- lvds-channel@0 {
- reg = <0>;
- fsl,data-mapping = "spwg"; /* "jeida"; */
- fsl,data-width = <18>;
- crtc = "ipu2-di1";
- primary;
- status = "okay";
-
- display-timings {
- native-mode = <&timing_xga>;
- /* LDB-AM-800600LTNQW-A0H */
- timing_svga: 800x600 {
- clock-frequency = <55000000>;
- hactive = <800>;
- vactive = <600>;
- hback-porch = <112>;
- hfront-porch = <32>;
- vback-porch = <3>;
- vfront-porch = <17>;
- hsync-len = <80>;
- vsync-len = <4>;
- hsync-active = <0>;
- vsync-active = <0>;
- pixelclk-active = <0>;
- };
- /* Standard XGA timing */
- timing_xga: 1024x768 {
- clock-frequency = <65000000>;
- hactive = <1024>;
- vactive = <768>;
- hback-porch = <160>;
- hfront-porch = <24>;
- vback-porch = <29>;
- vfront-porch = <3>;
- hsync-len = <136>;
- vsync-len = <6>;
- hsync-active = <0>;
- vsync-active = <0>;
- pixelclk-active = <0>;
- };
- timing_wxga: 1280x800 {
- clock-frequency = <68930000>;
- hactive = <1280>;
- vactive = <800>;
- hback-porch = <64>;
- hfront-porch = <64>;
- vback-porch = <5>;
- vfront-porch = <5>;
- hsync-len = <40>;
- vsync-len = <6>;
- hsync-active = <0>;
- vsync-active = <0>;
- pixelclk-active = <0>;
- };
- /* LTTD1280800101-L4WH-CT1, note that it needs
- fsl,data-mapping = "spwg"; fsl,data-width = <24>; */
- timing_wxga1: 1280x800-1 {
- clock-frequency = <71100000>;
- hactive = <1280>;
- vactive = <800>;
- hback-porch = <60>;
- hfront-porch = <60>;
- vback-porch = <7>;
- vfront-porch = <7>;
- hsync-len = <40>;
- vsync-len = <9>;
- hsync-active = <0>;
- vsync-active = <0>;
- pixelclk-active = <0>;
- };
- timing_fullhd: 1920x1080 {
- clock-frequency = <138500000>;
- hactive = <1920>;
- vactive = <1080>;
- hback-porch = <80>;
- hfront-porch = <48>;
- vback-porch = <23>;
- vfront-porch = <3>;
- hsync-len = <32>;
- vsync-len = <5>;
- hsync-active = <0>;
- vsync-active = <0>;
- pixelclk-active = <0>;
- };
- };
- };
-
- lvds-channel@1 {
- reg = <1>;
- fsl,data-mapping = "spwg";
- fsl,data-width = <18>;
- crtc = "ipu1-di0";
- status = "okay";
-
- display-timings {
-/* native-mode = <&timing_svga_ch2>;*/
- /* LDB-AM-800600LTNQW-A0H */
- timing_svga_ch2: 800x600 {
- clock-frequency = <55000000>;
- hactive = <800>;
- vactive = <600>;
- hback-porch = <112>;
- hfront-porch = <32>;
- vback-porch = <3>;
- vfront-porch = <17>;
- hsync-len = <80>;
- vsync-len = <4>;
- hsync-active = <0>;
- vsync-active = <0>;
- pixelclk-active = <0>;
- };
- };
- };
+ status = "okay";
+ split-mode; // split mode on
+// dual-mode;
+
+ lvds-channel@0 {
+ reg = <0>;
+ fsl,data-mapping = "spwg"; /* "jeida"; */
+ fsl,data-width = <24>;
+ crtc = "ipu2-di1";
+ primary;
+ status = "okay";
+
+ display-timings {
+ native-mode = <&timing_wide>;
+ /* LDB-AM-800600LTNQW-A0H */
+ timing_svga: 800x600 {
+ clock-frequency = <55000000>;
+ hactive = <800>;
+ vactive = <600>;
+ hback-porch = <112>;
+ hfront-porch = <32>;
+ vback-porch = <3>;
+ vfront-porch = <17>;
+ hsync-len = <80>;
+ vsync-len = <4>;
+ hsync-active = <0>;
+ vsync-active = <0>;
+ pixelclk-active = <0>;
+ };
+ /* Standard XGA timing */
+ timing_xga: 1024x768 {
+ clock-frequency = <65000000>;
+ hactive = <1024>;
+ vactive = <768>;
+ hback-porch = <160>;
+ hfront-porch = <24>;
+ vback-porch = <29>;
+ vfront-porch = <3>;
+ hsync-len = <136>;
+ vsync-len = <6>;
+ hsync-active = <0>;
+ vsync-active = <0>;
+ pixelclk-active = <0>;
+ };
+ timing_wxga: 1280x800 {
+ clock-frequency = <68930000>;
+ hactive = <1280>;
+ vactive = <800>;
+ hback-porch = <64>;
+ hfront-porch = <64>;
+ vback-porch = <5>;
+ vfront-porch = <5>;
+ hsync-len = <40>;
+ vsync-len = <6>;
+ hsync-active = <0>;
+ vsync-active = <0>;
+ pixelclk-active = <0>;
+ };
+ timing_fullhd: 1920x1080 {
+ clock-frequency = <138500000>;
+ hactive = <1920>;
+ vactive = <1080>;
+ hback-porch = <80>;
+ hfront-porch = <48>;
+ vback-porch = <23>;
+ vfront-porch = <3>;
+ hsync-len = <32>;
+ vsync-len = <5>;
+ hsync-active = <0>;
+ vsync-active = <0>;
+ pixelclk-active = <0>;
+ };
+ timing_wide: 1920x720 {
+ clock-frequency = <104600000>;
+ hactive = <1920>;
+ vactive = <720>;
+ hback-porch = <24>;
+ hfront-porch = <24>;
+ vback-porch = <8>;
+ vfront-porch = <57>;
+ hsync-len = <32>;
+ vsync-len = <5>;
+ hsync-active = <0>;
+ vsync-active = <0>;
+ pixelclk-active = <0>;
+ };
+ };
+ };
+
+ lvds-channel@1 {
+ reg = <1>;
+ fsl,data-mapping = "spwg";
+ fsl,data-width = <18>;
+ crtc = "ipu1-di0";
+ status = "okay";
+
+ display-timings {
+ native-mode = <&timing_wide_ch2>;
+ /* LDB-AM-800600LTNQW-A0H */
+ timing_svga_ch2: 800x600 {
+ clock-frequency = <55000000>;
+ hactive = <800>;
+ vactive = <600>;
+ hback-porch = <112>;
+ hfront-porch = <32>;
+ vback-porch = <3>;
+ vfront-porch = <17>;
+ hsync-len = <80>;
+ vsync-len = <4>;
+ hsync-active = <0>;
+ vsync-active = <0>;
+ pixelclk-active = <0>;
+ };
+ timing_wide_ch2: 1920x720 {
+ clock-frequency = <104600000>;
+ hactive = <1920>;
+ vactive = <720>;
+ hback-porch = <24>;
+ hfront-porch = <24>;
+ vback-porch = <8>;
+ vfront-porch = <57>;
+ hsync-len = <32>;
+ vsync-len = <5>;
+ hsync-active = <0>;
+ vsync-active = <0>;
+ pixelclk-active = <0>;
+ };
+ };
+ };
};https://stackoverflow.com/questions/58105481
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