The event fired when the end user clicks a node in the tree view. You will have to suppress the typical right-click context menu from being displayed and replace it with your functionality. These are the most common events you will need to intercept to prevent the intrinsic server-side events or post-backs from happening. The following examples are going to display the intercepted event, how to get the meta-data from the tree node's NodeData property on the client and how to parse the key valued pair information from the NodeData property.
This information was previously hard coded in source code. Device Tree data can be represented in several different formats. It is derived from the device tree format used by Open Firmware to encapsulate platform information.
The device tree data is typically created and maintained in a human readable format in. The Linux build system pre-processes the source with cpp. The device tree source is compiled into a binary format contained in a. The format of the data in the.
The Linux operating system uses the device tree data to find and register the devices in the system. The FDT is accessed in the raw form during the very early phases of boot, but is expanded into a kernel internal data structure known as the Expanded Device Tree EDT for more efficient access for later phases of the boot and after the system has completed booting.
There is interest in extending support for device trees to other platforms, to unify the handling of platform description across kernel architectures.
The Flattened Device Tree is It describes a machine hardware configuration. It is derived from the device tree format used by Open Firmware. The format is expressive and able to describe most board design aspects including: The Flattened Device Tree is not See "Competing Solutions" below is not intended to be a universal interface.
It is a useful data structure which solves several problems, but whether or not to use it is still up to the board port author. No requirement to convert existing board ports No requirement to modify existing firmware Advantages for distributions potentially fewer kernel images needed on an installer image ie.
Becomes feasible for current installer image to boot on future hardware platforms using same chipset. FDT is only part of the solution here. Some boot software is still required to select and pass in the correct FDT image.
Focus on device driver development instead. SoC vendor supplied reference design binaries may also be bootable on custom machine. No need to allocate a new global ARM machine id for each new board variant.
Since the hardware description is constrained to the device tree source, FPGA engineers can test design changes without getting involved with kernel code. Alternately, kernel coders don't need to manually extract design changes from the FPGA design files.
If initial release gets the board description wrong, then it is easily updated without a risky reflash of firmware. Xilinx FPGA tools do device tree source generation U-Boot firmware can inspect and modify an FDT image before booting Competing Solutions board specific data structures Some platforms use board-specific C data structures for passing data from the bootloader to the kernel.
Experience with PowerPC demonstrated that using a custom C data structure is certainly an expedient solution for small amounts of data, but it causes maintainability issues in the long term and it doesn't make any attempt to solve the problem of describing the board configuration as a whole.
Special cases tend to grow and there is no way for the kernel to determine what specific version of the data structure is passed to it. PowerPCs board info structure ended up being a mess of ifdefs and ugly hacks, and it still only passed a handful of data like memory size and Ethernet MAC addresses.
ATAGs have the elegance of providing an well defined namespace for passing individual data items memory regions, initrd address, etc and the operating system can reliably decode them. However, only a dozen or so ATAGs are defined and is not expressive enough to describe the board design.Topping Techniques Can Be Bad for Trees, Homeowners.
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