When I am trying to execute python on crontab ,I jut run a dummy program and I found the following information I have given my crontab like this What will be the path for my corntab Answer Always use absolute paths when adding cronjobs:
Tag: linux-device-driver
Error initialization from incompatible pointer of IOCTL function in Linux kernel 4.8.0-53-generic Linux Mint 64 bit
I’ve got an error while writing a char device module, using Ioctl command. Note: please ignore all my print_k. Please, help me fix this. My thanks to all of you. Here is my code : Answer The third argument unsigned long arg[b] in the function prototype is dubious. It should be simply unsigned long arg e…
IRQCHIP_DECLARE: init function is not being run
I am trying to use the Xilinx interrupt controller driver in an embedded ARM FPGA system I am developing. (https://github.com/torvalds/linux/blob/master/drivers/irqchip/irq-xilinx-intc.c) At the end of this driver is the line: IRQCHIP_DECLARE(xilinx_intc_xps, “xlnx,xps-intc-1.00.a”, xilinx_intc_of…
tcpdump error message “That device doesn’t support monitor mode”
Running Linux on a Xilinx ZCU102 development board. When using a 1000BASE-X & Tri-Mode Ethernet Mac. I can send pings out of the Ethernet port, but when I run tcpdump to try and show that packets are coming into the system… I get a strange error from tcpdump. Curious if anyone has any insight on thi…
How to avoid double creating directories in /proc?
I’m writing a Linux kernel module, and I’d like to create a subdirectory, /proc/foo/, and then expose several artificial files inside it that will be generated on the fly by my module. I know I can use proc_mkdir to create the foo directory, but if it already exists dmesg will display a warning, a…
Kernel API to get Physical RAM Offset
I’m writing a device driver (for Linux kernel 2.6.x) that interacts directly with physical RAM using physical addresses. For my device’s memory layout (according to the output of cat /proc/iomem), System RAM begins at physical address 0x80000000; however, this code may run on other devices with di…
What is use of struct i2c_device_id if we are already using struct of_device_id?
I was trying to understand a codec driver code on Linux kernel 4.4. The codec is connected to sound card using i2c bus and the codec driver code is written as I2C client. Client’s struct i2c_driver contains both i2c_device_id information and of_device_id information. Now as per my understanding client&#…
Linux enable pca9685 in sysfs
I would like to enable a PCA9685 as a PWM in /sys/class/pwm/. The Platform is a Raspberry Pi 2 and the chip is connected to /dev/i2c-1. I find the chip with i2c-detect, but i don’t know how do I enable this driver: http://lxr.free-electrons.com/source/drivers/pwm/pwm-pca9685.c. I also found this but it …
Linux device tree (AD5628)
I am trying to use AD5628 Digital to analog converter on my raspberry Pi 3 board . I have enabled the driver for that (http://lxr.free-electrons.com/source/drivers/iio/dac/ad5064.c) in the Yocto kernel . But when i opened the path /sys/bus/iio/devices/ Mentioned in (https://wiki.analog.com/resources/tools-sof…
spidev Linux driver on Intel Atom board
I am working on bringing up SPI on Kontron’s Atom-based SMARC-sXBTi board under Linux. Kontron provided Yocto BSP but it does not include SPI driver. I rebuilt Linux with SPI support. I can see the SPI controller in lspci and in sysfs the SPI PCI device is bound to pca2xx_spi_pci driver. As I understand…