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2018-06-26libfdt: Add helpers for accessing unaligned wordsDavid Gibson1-1/+1
This adds some helpers to load (32 or 64 bit) words from an fdt blob, even if they're unaligned and we're on a platform that doesn't like plain unaligned loads and stores. We then use the helpers in a number of places. There are two purposes for this: 1) This makes libfdt more robust against a blob loaded at an unaligned address. It's usually good practice to load a blob at a 64-bit alignment, but it's nice to work even then. 2) Users can use these helpers to load integer values from within property values. These can often be unaligned, even if the blob as a whole is aligned, since some property encodings have integers and strings mixed together without any alignment gaps. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
2018-06-07Consolidate utilfdt_read_len() variantsDavid Gibson1-1/+1
There are no less than _four_ variants on utilfdt_read() which is a bit excessive. The _len() variants are particularly pointless, since we can achieve the same thing with very little extra verbosity by using the usual convention of ignoring return parameters if they're NULL. So, get rid of them (we keep the shorter names without _len, but add now-optional len parameters). Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Reviewed-by: Simon Glass <sjg@chromium.org> Tested-by: Alexey Kardashevskiy <aik@ozlabs.ru> Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>
2018-01-27Add limited read-only support for older (V2 and V3) device tree to libfdt.Nathan Whitehorn1-3/+1
This can be useful in particular in the kernel when booting on systems with FDT-emitting firmware that is out of date. Releases of kexec-tools on ppc64 prior to the end of 2014 are notable examples of such. Signed-off-by: Nathan Whitehorn <nwhitehorn@freebsd.org> [dwg: Some whitespace cleanups] Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
2017-08-21fdtget: Split out cell list display into a new functionSimon Glass1-15/+34
The show_data() function is quite long. Split out the part that loops through the values. This makes it easier to add new features. Signed-off-by: Simon Glass <sjg@chromium.org> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
2017-03-06fdtget: Use @return to document the return valueNicolas Iooss1-1/+1
Signed-off-by: Nicolas Iooss <nicolas.iooss_linux@m4x.org> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
2017-03-06Fix assorted sparse warningsDavid Gibson1-1/+1
This fixes a great many sparse warnings on the fdt and libfdt sources. These are mostly due to incorrect mixing of endian annotated and native integer types. This includes fixing a couple of quasi-bugs where we had endian conversions the wrong way around (this will have the right effect in practice, but is certainly conceptually incorrect). This doesn't make the whole tree sparse clean: there are many warnings in bison and lex generated code, and there are a handful of other remaining warnings that are (for now) more trouble than they're worth to fix (and are not genuine bugs). Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
2016-07-24fdtget.c: Fix memory leakJean-Christophe Dubois1-1/+7
CID 132823 (#1 of 1): Resource leak (RESOURCE_LEAK) 5. leaked_storage: Variable blob going out of scope leaks the storage it points to. Signed-off-by: Jean-Christophe Dubois <jcd@tribudubois.net> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
2013-05-24util: drop "long" from usage helpersMike Frysinger1-3/+3
Now that all utils have converted to the new usage framework, we can rename to just plain "usage()" and avoid naming conflicts. Signed-off-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
2013-05-24dtc/fdt{get, put}/convert-dtsv0-lexer: convert to new usage helpersMike Frysinger1-33/+27
This helps standardize the flag processing and the usage screens. Only lightly tested; would be great if someone who uses these utils could double check. Signed-off-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
2013-04-22Revert "utilfdt_read: pass back up the length of data read"Jon Loeliger1-1/+1
This reverts commit cc2c178727cdeca4eb9756637c2e09e50e0856e7. It was the wrong version of the patch.
2013-04-21utilfdt_read: pass back up the length of data readMike Frysinger1-1/+1
For a follow up commit, we want to be able to scan the buffer that was returned to us. In order to do that safely, we need to know how big the buffer actually is, so pass that back if requested. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2012-03-07fdtget: Add -d to provide a default valueSimon Glass1-3/+17
Sometimes the requested node or property is not present in the device tree. This option provides a way of reporting a default value in this case, rather than halting with an error. Signed-off-by: Simon Glass <sjg@chromium.org> Acked-by: David Gibson <david@gibson.dropbear.id.au>
2012-03-07fdtget: Add -l to list the subnodes of a nodeSimon Glass1-12/+84
This option lists the subnodes of each node given as a parameter, one subnode per line. Signed-off-by: Simon Glass <sjg@chromium.org> Acked-by: David Gibson <david@gibson.dropbear.id.au>
2012-03-07fdtget: Add -p to list the properties of a nodeSimon Glass1-6/+60
This option lists the properties of each node given as a parameter, one property per line. Signed-off-by: Simon Glass <sjg@chromium.org> Acked-by: David Gibson <david@gibson.dropbear.id.au>
2012-03-07fdtget: Fix multiple arg bug and add test for itSimon Glass1-3/+3
There is a rather unfortunate bug in fdtget in that if multiple argument sets are provided, it just repeats displaying the first set ones for each set. Fix this bug and add a test for it. Signed-off-by: Simon Glass <sjg@chromium.org> Acked-by: David Gibson <david@gibson.dropbear.id.au>
2012-02-03Trivial style fixupDavid Gibson1-2/+2
Having braces on an if branch but not the else branch, or vice versa is ugly and can trick you when reading the code. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
2012-01-21Add fdtget utility to read property values from a device treeSimon Glass1-0/+226
This simply utility makes it easy for scripts to read values from the device tree. It is written in C and uses the same libfdt as the rest of the dtc package. What is it for: - Reading fdt values from scripts - Extracting fdt information within build systems - Looking at particular values without having to dump the entire tree To use it, specify the fdt binary file on command line followed by a list of node, property pairs. The utility then looks up each node, finds the property and displays the value. Each value is printed on a new line. fdtget tries to guess the type of each property based on its contents. This is not always reliable, so you can use the -t option to force fdtget to decode the value as a string, or byte, etc. To read from stdin, use - as the file. Usage: fdtget <options> <dt file> [<node> <property>]... Options: -t <type> Type of data -h Print this help <type> s=string, i=int, u=unsigned, x=hex Optional modifier prefix: hh or b=byte, h=2 byte, l=4 byte (default) Signed-off-by: Simon Glass <sjg@chromium.org>