U-boot fdt file

U-Boot to configure itself according to what it finds there. If you have. An fdt can be specified in source format as a text file. To read about. You also might find this section of the Linux kernel documentation. In case you are wondering, OF stands for Open Firmware.

To use this feature you will need to get the device tree compiler here:. Then run the compiler your version will vary :. You will also find a useful ftdump utility for decoding a binary file. Where do I get an fdt file for my board? You may find that the Linux kernel has a suitable file. Look in the. If not you might find other boards with suitable files that you can. Look in the board directories for files with a. Failing that, you could write one from scratch yourself!

Then put your device tree. The name of this. A common approach is then to. You cannot use both of these options at the same time. Board peripherals - describe a chip on the board, in a similar way to an SOC peripheral Normally, these are linked to an SOC peripheral using a phandle. Aliases - assign a new name to a peripheral instance Some peripherals have multiple instances.

It is often useful to assign an order to the instances. This is done by numbering the nodes within the aliases section. We store the start address of U-Boot textbase and the type of verified boot we are using twostop.

U-Boot locates it at start-up. That approach may become partially useful in future, but we decided to drop it for upstream. There is a still an fdtdec library which helps a lot, but drivers must decode their own nodes.

Header Files U-Boot uses header files for configuration. Since the FDT change this has become very simple. It simply includes seaboard. It includes tegra2-common. Each variant is built into its own subdirectory in the temporary build directory: developer, recovery, etc. These are used by chromeos-bios see later. Since this ebuild inherits tegra-bct , these functions will be used for building. This consists of U-Boot, FDT settings, recovery-mode screens and the required keys for performing a verified boot.

If you look in the output of this command you should see the make command it is using. If you really want to, you can use this command, which takes the build time down to around 6s. This can reduce an incremental build to about 1s on a fast machine 16 core. If you are working in u-boot and constantly flashing U-Boot for different Tegra2 boards then you might find this script useful.

Run it within your U-Boot source tree. Beware this is not for beginners. Before you use this script, read it through and compare it with the U-Boot ebuild. You can select an FDT to use to change the board. Note: this script could be enhanced to output the resulting u-boot binary to a subdirectory with make Learn more.

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