实施自定义u-boot命令 [英] Implement custom u-boot command

问题描述

我想向u-boot添加自定义命令命令，因为它是一个简单的hello world命令.

I want to add custom command command to u-boot be it a simple hello world command.

搜索后，我发现此链接 Yocto u-boot自定义命令在其中显示以cmd/misc.c中的timer命令为起点.

After searching I found this link Yocto u-boot Custom Commands where it says to look at timer command in cmd/misc.c as starting point.

如何将此timer命令带到我的u-boot映像? 我假设我已经对makefile进行了更改，但是不确定我应该编辑哪个makefile.

How do I bring this timer command to my u-boot image? I assume I have make changes to the makefiles but not sure which makefile I should edit.

我正在使用qemu通过以下方法在Ubuntu 18.04中测试u-boot映像

I am using qemu to test the u-boot image in Ubuntu 18.04 using the following method

1. 克隆了github中的u-boot源.
2. 在系统中安装了所有构建依赖项.
3. 使用make qemu_arm_config ARCH=arm CROSS_COMPILE=arm-none-eabi-
准备的u-boot配置文件
4. 构建u-boot make all ARCH=arm CROSS_COMPILE=arm-none-eabi-
5. 使用u-boot映像qemu-system-arm -M virt -nographic -kernel u-boot
启动qemu

1. Cloned the u-boot source from github.
2. Installed all the build dependencies in the system.
3. Prepared u-boot config files using make qemu_arm_config ARCH=arm CROSS_COMPILE=arm-none-eabi-
4. Build u-boot make all ARCH=arm CROSS_COMPILE=arm-none-eabi-
5. Launch qemu with u-boot image qemu-system-arm -M virt -nographic -kernel u-boot

U引导日志

$ qemu-system-arm -M virt -nographic -kernel u-boot 


U-Boot 2020.01-dirty (Mar 29 2020 - 15:46:14 +0530)

DRAM:  128 MiB
WARNING: Caches not enabled
Flash: 128 MiB
*** Warning - bad CRC, using default environment

In:    pl011@9000000
Out:   pl011@9000000
Err:   pl011@9000000
Net:   No ethernet found.
Hit any key to stop autoboot:  0 
=> timer
Unknown command 'timer' - try 'help'
=> 

更多细节

U-boot:

Few more details

U-boot:

• repo: https://github.com/u-boot/u-boot .git
• 分支/标签:v2020.01

主机操作系统:

Distributor ID: Ubuntu
Description:    Ubuntu 18.04.4 LTS
Release:    18.04
Codename:   bionic

推荐答案

doc/README.commands描述了应如何实现命令.

doc/README.commands describes how commands should be implemented.

您的新C文件应该在目录cmd/中.在cmd/Makefile中，您将必须添加目标文件，例如

Your new C file should be in directory cmd/. In cmd/Makefile you will have to add your object file, e.g.

obj-$(CONFIG_CMD_TIMER) += timer.o

在cmd/Kconfig中为您的命令添加一个新的配置选项. Kconfig语法在 https://www.kernel.org/中进行了描述doc/Documentation/kbuild/kconfig-language.txt .

In cmd/Kconfig add a new configuration option for your command. The Kconfig syntax is described in https://www.kernel.org/doc/Documentation/kbuild/kconfig-language.txt.

运行

make menuconfig

启用您的配置选项.

这篇关于实施自定义u-boot命令的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！