[U-Boot] [PATCH 2/2] libfdt: return correct value if #size-cells property is not present

Matthias Brugger mbrugger at suse.de
Wed Sep 4 16:29:27 UTC 2019

Hi all,

On 13/08/2019 11:34, Simon Glass wrote:
> +Stephen Warren
> Hi Matthias,
> On Thu, 1 Aug 2019 at 05:42, Matthias Brugger <matthias.bgg at gmail.com> wrote:
>> Hi all,
>> On 26/07/2019 11:13, matthias.bgg at kernel.org wrote:
>>> From: Matthias Brugger <mbrugger at suse.com>
>>> According to the device tree specification, the default value for
>>> was not present.
>>> This patch also makes fdt_address_cells() and fdt_size_cells() conform
>>> to the behaviour documented in libfdt.h. The defaults are only returned
>>> if fdt_getprop() returns -FDT_ERR_NOTFOUND, otherwise the actual error
>>> is returned.
>>> This is based on upstream commit:
>>> aa7254d ("libfdt: return correct value if #size-cells property is not present")
>>> but misses the test case part, as we don't implement them in u-boot.
>>> Signed-off-by: Matthias Brugger <mbrugger at suse.com>
>> After running these two patches through the CI [1] I realized that three test
>> are failing:
>> test/py sandbox
>> test/py sandbox with clang
>> test/py sandbox_flattree
>> All three fail dm_test_fdt_translation() in the case "No translation for busses
>> with #size-cells == 0" [2].
>> Can anybody with more insight in the test infrastructure and the sandbox
>> architecture help me to identify if this is
>> a) a bug in the sandbox
>> b) a bug in our test
>> c) a bug in my patch
>> I write this because I'm pretty sure that it is not option c), as we just stick
>> to the specs here.
> Can you check the test and see? It might well be that the test is wrong.
> I hope we don't have tet code relying on this.

I think I found the error. I missed a commit in libftd which fixes the issue.
I'll send a v2 soon.


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