- Docker run image status 一直是 up 4 minutes drivers#
- Docker run image status 一直是 up 4 minutes driver#
- Docker run image status 一直是 up 4 minutes full#
- Docker run image status 一直是 up 4 minutes software#
- Docker run image status 一直是 up 4 minutes series#
Docker run image status 一直是 up 4 minutes driver#
These values are used to bind a device with the driver (simply put, to indicate the kernel which driver will handle this hw). The other one has 2 strings: "xlnx, axi-gpio-2.0" and "xlnx, xps-gpio-1.00.a". Going back to the pl.dtsi, some of the lines are self explanatory, others are less important to our journey, and the most interesting ones are these:Ĭompatible is used twice here, one with a "simple-bus" value, which means a simple memory-mapped bus with no specific handling or driver (driver like I2C, SPI, etc.). This means if we add some properties to the system-user.dtsi, which are already exist in the pl.dtsi, the ones in the pl.dtsi will be ran over. All the dtsi files are parsed by a specific order, and the system-user.dtsi is the last one. I will not go over all the fields here, but there are some lines worth paying attention to.īefore doing so, I will go to the created file: system-user.dtsi, which is an empty one, used as a place-holder, This file allows one to overwrite properties in the Xilinx-generated device-tree pl.dtsi. Specifically for the simple project I've designed for this tutorial, except the Zynq, system reset and AXI IC (which no interaction is needed), the AXI GPIO is the only one exists, and this is shown on the left. It should be located at: "/project-spec/meta-user/recipes-bsp/device-tree/files". Since both files are buried deep inside the Petalinux folder, the best advice I could give you is using the 'locate' command in Linux for searching a file in a specific folder (there are other methods as well). Let's look at 'system-user.dtsi' and 'pl.dtsi', both are created during the build process of Petalinux image. There can be many device tree files, all are read and parsed during Petalinux image compilation (order does matter. The bootloader loads 2 files at power up: the DTB and the kernel image. It is located at a different file called: Device Tree Blob (a compiled device tree file). The kernel no longer contains any hardware description. So this is how the device tree method was born. At the end, a unique kernel for each type of hardware was a necessity. There were many components, many boards, many header files for each configuration (even though the compilers were the same). This caused quite a headache for the ARM community (nice article about the evaluation of the device tree is here). I'll try not to repeat what all of them have covered.īefore the device tree methodology was used, all hardware description used to reside inside the kernel.
Docker run image status 一直是 up 4 minutes full#
So, you have here enough reading material for a full weekend. Adam Taylor wrote a nice one here, the "guide for dummies" is here and a really extensive one by NXP which covers everything one can think of is here. There are many tutorials online regarding device trees. This will output all build log to the screen and can help figuring out what went wrong. If it'll fail, you can run it again using the '-v' (for Verbose output): petalinux-build -v petalinux-buildĪnd now, it'll take a few minutes, time to drink some coffee. Next we'll build our image to create the necessary device tree file, in order to change them, accordingly to our hardware components. (Enable will automatically add our helloWorld app to the rootfs) We can also do it in a shorter way: Petalinux-create -t apps -template c++ -name helloWorld -enable
Docker run image status 一直是 up 4 minutes software#
In general we'll need to design the Vivado project only once during the project lifetime, since the rest of our work will be in the software or Linux side. Believe me, the owls are not what they seem. Yet, things will get more interesting as I'll go forward with the UIO debugging phase. It will probably seems like a really simple one for the common user. So, to get things going, I'll start with a very easy project in Vivado.
Eventually, I came to the conclusion that the most recommended way of doing that is with the UIO driver. Other are more complex, or less recommended, or both (like kernel driver).
Docker run image status 一直是 up 4 minutes drivers#
Some of these drivers cannot do this task since they lack support of interrupts. I've explained the various drivers for that. For that I dove deep into the GPIO drivers world of Embedded Linux. As I wrote in part 1, my goal was to toggle an IO and hit an interrupt.
Docker run image status 一直是 up 4 minutes series#
This is part 2 of the GPIO and Petalinux series of tutorials, aiming at hobbyists and/or professionals, working with Embedded Linux.