do_basic_setup

"do_basic_setup" 是 Linux 内核启动过程中的另一个函数，它是 "kernel_init_freeable" 函数的一部分，也是整个启动过程中的重要一环。在 "kernel_init_freeable" 函数完成了内核子系统和模块的初始化之后，"do_basic_setup" 函数会进一步对系统进行基本的配置和设置，以保证系统能够正常运行。具体来说，它会设置系统时钟、初始化进程管理、挂载文件系统、启动系统日志服务等等。这个函数的完成标志着内核启动过程的正式结束，此时操作系统已经可以接受用户的命令并开始工作。

相关问题

how to write a driver about am5728 use timer to capture pwm

To write a driver about AM5728 using timer to capture PWM, you can follow these steps:

1. Configure the timer module to capture the PWM signal.
2. Enable the timer module and set it to capture mode.
3. Configure the pinmux for the PWM input pin to select the timer as the input source.
4. Set up an interrupt to handle the timer capture event.
5. In the interrupt handler, read the timer value to get the PWM duty cycle.

Here is a sample code snippet to illustrate the basic structure of the driver:

void pwm_capture_init(void) {
    // Configure the timer module
    timer_config(timer_base_addr, TIMER_CAPTURE_MODE);

    // Configure the pinmux for the PWM input pin
    pinmux_config(pwm_input_pin, PINMUX_TIMER_INPUT);

    // Set up an interrupt to handle the timer capture event
    irq_setup(irq_num, pwm_capture_handler);
}

void pwm_capture_handler(void) {
    // Read the timer value to get the PWM duty cycle
    uint32_t timer_value = timer_read(timer_base_addr);
    uint32_t pwm_duty_cycle = calculate_pwm_duty_cycle(timer_value);

    // Do something with the PWM duty cycle value
    do_something(pwm_duty_cycle);
}

Note that you will need to fill in the details for the `timer_config`, `pinmux_config`, `irq_setup`, `timer_read`, `calculate_pwm_duty_cycle`, and `do_something` functions based on the specific implementation details of your system.

yocto编译wayland-egl

To compile Wayland-EGL in Yocto, you can follow these steps:

1. Add the necessary layers to your Yocto build. This may include the meta-openembedded layer, which contains the recipes for Wayland and other related packages.

2. Configure your build to include the Wayland-EGL packages. You can do this by adding the following lines to your local.conf file:

IMAGE_INSTALL_append = " wayland-protocols"
IMAGE_INSTALL_append = " wayland-egl"

This will ensure that the Wayland-Protocols and Wayland-EGL packages are included in your Yocto image.

3. Build your Yocto image. You can do this by running the `bitbake` command with the name of your image, such as:

bitbake core-image-minimal

This will compile the necessary packages and dependencies, and generate a Yocto image that includes Wayland-EGL.

4. Configure your system to use Wayland-EGL as the default display server. You can do this by modifying the `weston.ini` file in your image's root filesystem. Add the following lines to the file:

[core]
modules=eglbackend.so,desktop-shell.so

[shell]
background-image=/usr/share/backgrounds/gnome/Aqua.jpg
panel-location=none

This will configure the Weston compositor to use EGL as the backend for rendering graphics.

5. Boot your Yocto image and test Wayland-EGL. You can do this by running a Wayland client application, such as `weston-terminal` or `weston-flower`. If everything is configured correctly, you should see the application window rendered using EGL.

These are the basic steps for compiling Wayland-EGL in Yocto. However, the exact steps may vary depending on your specific Yocto setup and hardware platform. It's recommended to consult the Yocto documentation and community resources for more detailed instructions and troubleshooting tips.