linux-device-driver

来源： https://stackoverflow.com/questions/10696863/any-example-of-copy-from-user-kernel-and-userspace

来源： https://stackoverflow.com/questions/10696863/any-example-of-copy-from-user-kernel-and-userspace

来源： https://stackoverflow.com/questions/10696863/any-example-of-copy-from-user-kernel-and-userspace

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 5 days ago . Improve this question What's the best way to simulate the same thing as a user doing an "echo a > /proc/file" But doing it from the KERNEL (2.6 in my case) even when the ROOT partition is unreachable. As far as I know the /proc file system is created by the kernel and resides in memory so it should

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 5 days ago . Improve this question What's the best way to simulate the same thing as a user doing an "echo a > /proc/file" But doing it from the KERNEL (2.6 in my case) even when the ROOT partition is unreachable. As far as I know the /proc file system is created by the kernel and resides in memory so it should

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 5 days ago . Improve this question What's the best way to simulate the same thing as a user doing an "echo a > /proc/file" But doing it from the KERNEL (2.6 in my case) even when the ROOT partition is unreachable. As far as I know the /proc file system is created by the kernel and resides in memory so it should

问题 Hello I have beagleboneblack board and have kernel source code I want to make my i2c work as a module so for that, I have done some changes in .config file # # I2C support # CONFIG_I2C=m and cross compile kernel make dtbs zImage -j8 CROSS_COMPILE=arm-linux-gnueabihf- But after compile successfully, CONFIG_I2C change from 'm' to 'y' how to solve this problem? 来源： https://stackoverflow.com/questions/62752609/how-to-make-i2c-core-as-module

问题 How to notify the user space application whenever an event occurs in the kernel space? A hardware generates an interrupt when the data arrives at some GPIO. This data is copied to the kernel buffer. At this point, I want the driver to notify the application that it can call read function to copy the data form kernel buffer to user space buffer. I thought of using epoll method, but epoll indicates whether the device is ready to be read from. What I want is that, epoll to indicate whenever

问题 I am in the process of collecting some sort of Linux Kernel activities. I have placed multiple printk statements with in the kernel source code and would like to monitor those during regular kernel activities. Unfortunately, I have realized that the Kernel Log Buffer size ( CONFIG_LOG_BUF_SHIFT ) cannot be more that 2^21 which is essentially equal to 2M entries. Is there any other way to record more than 2M Kernel messages ? 回答1: You can set the kernel log buffer to log_buf_len=4M in your

问题 I am in the process of collecting some sort of Linux Kernel activities. I have placed multiple printk statements with in the kernel source code and would like to monitor those during regular kernel activities. Unfortunately, I have realized that the Kernel Log Buffer size ( CONFIG_LOG_BUF_SHIFT ) cannot be more that 2^21 which is essentially equal to 2M entries. Is there any other way to record more than 2M Kernel messages ? 回答1: You can set the kernel log buffer to log_buf_len=4M in your