At present, the fdt_subnode_offset() and fdt_path_offset() functions
in libfdt require the exact name of the nodes in question be passed,
including unit address.
This is contrary to traditional OF-like finddevice() behaviour, which
allows the unit address to be omitted (which is useful when the device
name is unambiguous without the address).
This patch introduces similar behaviour to
fdt_subnode_offset_namelen(), and hence to fdt_subnode_offset() and
fdt_path_offset() which are implemented in terms of the former. The
unit address can be omitted from the given node name. If this is
ambiguous, the first such node in the flattened tree will be selected
(this behaviour is consistent with IEEE1275 which specifies only that
an arbitrary node matching the given information be selected).
This very small change is then followed by many more diffs which
change the test examples and testcases to exercise this behaviour.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
At present, the testcases for read/write functions (setprop,
del_property and del_node) are only invoked on the single
asm-generated tree, not on any of the other tree images which should
be equivalent. The functions in question will (correctly) not work on
the "unfinished" tree output from sw_tree1, but should work on most of
the others.
This patch extends the run_tests script to invoke the r/w testcases on
more example trees. The testsuite still passes clean with this
addition.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
In the dtc tree, both flat_dt.h and libfdt/fdt.h have structures and
constants relating to the flattened device tree format derived from
asm-powerpc/prom.h in the kernel. The former is used in dtc, the
latter in libfdt.
libfdt/fdt.h is the more recent, revised version, so use that
throughout, removing flat_dt.h.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This large patch removes all trailing whitespace from dtc (including
libfdt, the testsuite and documentation). It also removes a handful
of redundant blank lines (at the end of functions, or when there are
two blank lines together for no particular reason).
As well as anything else, this means that quilt won't whinge when I go
to convert the whole of libfdt into a patch to apply to the kernel.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This patch adds a handful of simple testcases for dtc. It adds a dts
file which should generate the same sample tree as is used for the
libfdt testcases, and tests invoking dtc on this dts, plus the
standard batch of libfdt cases on the resulting dtb, which effectively
checks that the dtb is correct.
Because the test framework assumes each testcase is an executable with
the right output conventions, we use a little shell script, dtc.sh, as
a wrapper around dtc itself. It simply invokes dtc and returns a PASS
or FAIL depending on whether dtc returned an error.
It's not much, but it's a start.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
run_tests.sh from the dtc testsuite currently has a facility ro run
just "functional" or just "stress" tests. This distinction is carried
over from libhugetlbfs where the test framework originated, and where
it made sense.
In dtc, we have no stress tests, so running these subsections isn't
particularly interesting. This patch removes these test subsets,
instead defining a single "libfdt" test subset for testcases related
to libfdt (and not dtc proper only. Currently that's all of the
testcases, but with any luck we'll have some dtc testcases in the
future.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Flat device trees always have integers in their structure stored as
big-endian. From this point of view, property values are
bags-of-bytes and any endianness is up to users of the device tree to
determine.
The libfdt testcases which use properties with integer values,
currently use native endian format for the architecture on which the
testcases are run. This works ok for now, since both the creation and
checking of the example device trees happen in the same endianness.
This will become a problem, however, for tests of dtc which we want to
add in the nearish future. dtc always uses big-endian format for
'cell' format data in properties; as it needs to in order to produce
powerpc-usable device trees when hosted on a little-endian
architecture.
This patch, therefore, changes the libfdt testsuite to use big-endian
format always for integer format data, in order to interoperate sanely
with future dtc testcases. This also means that the example trees
created by the testsuite should now be byte-for-byte identical
regardless of dtc and libfdt's host platform, which is arguably an
advantage.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This patch adds a function to libfdt to locate nodes containing a
property with a specific value.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
With kernel commit eff2ebd207af9f501af0ef667a7d14befcb36c1b, we
clarified that in the flattened tree format, a particular nodes
properties are required to precede its subdnodes.
At present however, both dtc and libfdt will process trees which don't
meet this condition. This patch simplifies the code for
fdt_get_property() based on assuming that constraint. dtc continues
to be able to handle such an invalid tree - on the grounds that it's
useful for dtc to be able to correct such a broken tree - but this
patch adds a warning when this condition is not met while reading a
flattened tree.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This patch turns on optimisation in the Makefile by default. With the
optimizer on, some uninitialized variable warnings (one real, two
bogus) are now generated. This patch also squashes those again.
Currently, dtc relies on make's implicit rule to build the testcases.
This means that when not making verbosely (V=0, the default) there is
no message at all while relinking the testsuites. This can be very
confusing when updating libfdt.a (upon which the testcases depend) and
make appears to do nothing.
This patch corrects the situation, borrowing the rule used to link dtc
itself to link all the testcases as well.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
My recent implemenetation of fdt_get_path() had a bug - the while loop
tested offset which was unitialized on the first iteration. Depending
on code surrounding the call, this could cause fdt_get_path() to
return incorrect results.
This patch corrects the problem by applying some more correct thinking
to the loop condition.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
The bookkeeping for producing the testsuite summary (total number of
tests passed, failed and so forth) is broken. It uses $? across
several tests, but for checks after the first, the value of $? will no
longer contain the original return code, but just that from the
previous test. This patch fixes the problem.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This patch adds an fdt_parent_offset() function which returns an
offset to the parent node of a given node. It also adds two helper
functions which are used to implement fdt_parent_offset() but are also
exported: fdt_supernode_atdepth_offset() which returns the ancestor of
a given node at a specified depth from the root of the tree, and
fdt_node_depth() which returns the depth of a given node.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This patch adds an fdt_get_path() function to libfdt, which returns
the full path of a given node in a caller supplied buffer.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This patch adds a new fdt_get_name() function to libfdt which will
return a node's name string (including unit address, if any).
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Currently, fdt_path_offset() returns FDL_ERR_BADOFFSET if given a path
with a trailing '/'. In particular this means that
fdt_path_offset("/") returns FDT_ERR_BADOFFSET rather than 0 as one
would expect.
This patch fixes the function to accept and ignore trailing '/'
characters. As well as allowing fdt_path_offset("/") this means that
fdt_path_offset("/foo/") will return the same as
fdt_path_offset("/foo") which seems in keeping with the principle of
least surprise.
This also adds a testcase to ensure that fdt_path_offset("/") returns
0 as it should.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This is the new location for technical descriptions of the DTC.
Derived from the kernel's Documentation/powerpc/booting-without-of.txt.
The booting-without-of.txt that was here was very old and out of date.
Signed-off-by: Jon Loeliger <jdl@freescale.com>
This patch makes various improvements to dtc's make install target:
- libfdt is also installed. Specifically, libfdt.a and the
two export relevant header files, fdt.h and libfdt.h are installed.
- ftdump is no longer installed. It was only ever a
development debugging tool and may well go away at some point.
- In keeping with normal conventions, there is now a PREFIX
variable, allowing control of where things are installed (in /usr,
/usr/local, /opt, etc.).
- By default, installed into the user's home directory,
instead of /usr. This is friendlier for self-installers, package
builders can easily override PREFIX to restore the old behaviour.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
When writing the memory reserve table in assembly output,
emit both halves of each 64 bit number on a single .long
statement. This results in two lines per memory reserve
slot instead of four, each line contains one field (start
or size).
Signed-off-by: Milton Miller <miltonm@bga.com>
When adding a label, walk to the end of the list since the
label reflects the end of the data.
Since merging data buffers already preserved the order, this
will cause the labels to be emitted in order when writing
assembly output.
It should also aid emiting labels when writing dts output
should that be added in the future (data formatting would
need to break at each label).
Signed-off-by: Milton Miller <miltonm@bga.com>
Extend the parser grammer to allow labels before or after any
property data (string, cell list, or byte list), and any
byte or cell within the property data.
Store the labels using the same linked list structure as node
references, but using a parallel list.
When writing assembly output emit global labels as offsets from
the start of the definition of the data.
Note that the alignment for a cell list is done as part of the
opening < delimiter, not the = or , before it. To label a cell
after a string or byte list put the label inside the cell list.
For example,
prop = zero: [ aa bb ], two: < four: 1234 > eight: ;
will produce labels with offsets 0, 2, 4, and 8 bytes from
the beginning of the data for property prop.
Signed-off-by: Milton Miller <miltonm@bga.com>
Change the lexer to recognise a label in any context. Place
before other celldata and bytestrings to avoid the initial
characters being stolen by other matches.
A label is a character sequence starting with an alphabetic
or underscore optinally followed by the same plus digits and
terminating in a colon.
The included terminating colon will prevent matching hex numbers.
Signed-off-by: Milton Miller <miltonm@bga.com>
Change the grow_data_for function to copy struct data and
modifiy the fields it is updating instead of storing all
fields individually to a stack allocated struct.
This reduces maintence for future enhancements as now all
instances of struct data are created by modifying a copy
of an existing struct data or directly copying empty_data.
Signed-off-by: Milton Miller <miltonm@bga.com>
Allow a label to be placed on a memory reserve entry.
Change the parser to recognize and store them. Emit
them when writing assembly output.
Signed-off-by: Milton Miller <miltonm@bga.com>
Check that strtoul() parsed the complete string.
As with the number overflow case, write a non-fatal error
message to stdout.
Signed-off-by: Milton Miller <miltonm@bga.com>
The version 17 flat device tree format added struct size. When
writing version 17 assembly output the field must be emitted.
Signed-off-by: Milton Miller <miltonm@bga.com>
Commit 0738774fcc introduced some
incorrect indentation / bracketing in unflatten_tree(). By luck, the
extra break statement intended to be within an if block, but actually
afterwards has no semantic effect. Still, this patch gets rid of it
for cleanliness.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This patch substantially revamps the dtc Makefiles, in particular
better integrating the Makefile for dtc proper with the Makefiles
imported from libfdt for libfdt and the shared testsuite. Notable
changes:
- No recursive make calls. Instead subsidiary Makefiles are
included into the top-level Makefile so we get a complete dependency
information.
- Common pattern rules, CFLAGS etc. shared between dtc, libfdt
and testsuite, rather than separate copies.
- Vaguely Kbuild-like non-verbose mode used by default, which
makes warnings more prominent.
- libfdt Makefile consists only of variable definitions and
helper rules, to make it more easily embeddable into other Makefile
systems.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
The dtc tree currently includes two copies of the GPL - one which was
there originally, and one imported from the libfdt tree. This patch
gets rid of the extra copy in the libfdt tree.
In addition it renames the file containing the remaining copy from
COPYING to GPL. Since libfdt is dual-licensed, this seems clearer.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
There are quite a lot of testcases in the dtc testsuite (recently
imported from libfdt). It can be easy to miss a stray FAIL result in
the midst of all the rest. To improve this, this patch adds a summary
to the end of the testsuite results giving the total number of tests
along with the number of PASSes FAILs and other results.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Since Milton's patch, dtc will accept (and, correctly, ignore) NOP
tags when given dtb input v16 or later. However, although NOPs
weren't defined in earlier versions, they're not ambiguous, so should
be accepted there as well. This patch does so, printing a mere
warning when finding NOPs in a too-early dtb version.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
As a read-only functions, which take a const pointer to the fdt, treat
fdt_get_property() and fdt_getprop() as returning const pointers to
within the blob. fdt_get_property_w() and fdt_getprop_w() versions
are supplied which take a non-const fdt pointer and return a non-const
pointer for the benefit of callers wishing to alter the device tree
contents.
Likewise the lower-level fdt_offset_ptr() and _fdt_offset_ptr()
functions are changed to return const pointers, with *_w() versions
supplied.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Version 16 and later of the flat device tree format allow NOPs
to be placed in the tree. When processing dtb input, dtc must
recognise them.
Previously it would produce the error message
FATAL ERROR: Invalid opcode word 00000004 in device tree blob
Signed-off-by: Milton Miller <miltonm@bga.com>
At present, the lexer in dtc recognizes only space, tab and newline as
whitespace characters. This is broken; in particular this means that
dtc will get syntax errors on files with DOS-style (CR-LF) newlines.
This patch fixes the problem, using flex's built-int [:space:]
character class.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
With the last improvement to pad out the blob, I broke the blob
header totalsize adjustment. The adjustment was moved up in the
code before the memory image of the blob is created.
Signed-off-by: Gerald Van Baren <vanbaren@cideas.com>
David Gibson