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* fdtgrep: Improve error handling with invalid device treeSimon Glass2016-03-14-4/+10
| | | | | | | | | | This tool requires that the aliases node be the first node in the tree. But when it is not, it does not handle things gracefully. In fact it crashes. Fix this, and add a more helpful error message. Signed-off-by: Simon Glass <sjg@chromium.org> Reported-by: Masahiro Yamada <yamada.masahiro@socionext.com>
* fdtgrep: Simplify the alias generation codeSimon Glass2015-11-04-22/+10
| | | | | | | | We don't need to allocate a new region list when we run out of space. The outer function can take care of this for us. Signed-off-by: Simon Glass <sjg@chromium.org> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
* fdt: Add fdtgrep toolSimon Glass2015-07-21-0/+1234
This tool allows us to extract subsets of a device tree file. It is used by the SPL vuild, which needs to cut down the device tree size for use in limited memory. This tool was originally written for libfdt but it has not been accepted upstream, so for now, include it in U-Boot. Several utilfdt library functions been included inline here. If fdtgrep is eventually accepted in libfdt then we can bring that version of libfdt in here, and drop fdtgrep (requiring that fdtgrep is provided by the user). If it is not accepted then another approach would be to write a special tool for chopping down device tree files for SPL. While it would use the same libfdt support, it would be less code than fdtgrep.c because it would not have general-purpose functions. Another approach (which was used with v1 of this series) is to sprinkler all the device tree files with #ifdef. I don't like that idea. Signed-off-by: Simon Glass <sjg@chromium.org>