[PATCH] board: unmatched: Workaround failure to find .dtb file.

[Vagrant Cascadian]

On 2026-01-19, Tom Rini wrote:
> On Mon, Jan 19, 2026 at 07:42:59AM +0100, Marek Vasut wrote:
>> On 1/19/26 1:09 AM, Vagrant Cascadian wrote:
>> > The fdtdfile variable contains quotes:
>> > 
>> >    printenv fdtfile
>> >    fdtfile="sifive/hifive-unmatched-a00.dtb"
>> > 
>> > But this leads to issues which booting with an extlinux.conf format
>> > file failing to find the .dtb file:
>> > 
>> >    Retrieving file: /usr/lib/linux-image-6.12.63+deb13-riscv64/"sifive/hifive-unmatched-a00.dtb"
>> >    Skipping fdtdir /usr/lib/linux-image-6.12.63+deb13-riscv64/ for failure retrieving dts
>> > 
>> > Other platforms (e.g. rockpro64-rk3399) do not contain quotes in the
>> > fdtfile variable, and work properly out of the box.
>> > 
>> > The workaround suggested by marex is to hard-code the correct .dtb
>> > value, which works for me.
>> > 
>> > This has been present at least since version 2025.01, also present in
>> > 2026.01. I have not yet tested against git master branch.
>> > 
>> > This could probably be properly fixed by stripping the quotes in
>> > whatever processes the .env file. There are numerous other boards that
>> > have the same way of setting the fdtfile variable, which might
>> > similarly be effected by this issue.
>> > 
>> > Signed-off-by: Vagrant Cascadian <vagrant at debian.org>
>> > 
>> > Not sure who all to CC on this, please feel free to forward
>> > appropriately!
>> 
>> ./scripts/get_maintainer.pl -f board/sifive/unmatched/
>> 
>> produces a few names, added
>> 
>> > ---
>> >   board/sifive/unmatched/unmatched.env | 2 +-
>> >   1 file changed, 1 insertion(+), 1 deletion(-)
>> > 
>> > diff --git a/board/sifive/unmatched/unmatched.env b/board/sifive/unmatched/unmatched.env
>> > index 34425dc9efa..cdba2c8ae0e 100644
>> > --- a/board/sifive/unmatched/unmatched.env
>> > +++ b/board/sifive/unmatched/unmatched.env
>> > @@ -16,4 +16,4 @@ partitions=
>> >       name=loader1,start=17K,size=1M,type=${type_guid_gpt_loader1};
>> >       name=loader2,size=4MB,type=${type_guid_gpt_loader2};
>> >       name=system,size=-,bootable,type=${type_guid_gpt_system}; 
>> > -fdtfile=CONFIG_DEFAULT_FDT_FILE
>> > +fdtfile=sifive/hifive-unmatched-a00.dtb
>> 
>> Also +CC Peng because iMX is also affected.
>
> I'm setting aside the question of why we have both DEFAULT_FDT_FILE and
> DEFAULT_DEVICE_TREE and pointing to:
> commit d085e692c98d0d7b57cc577ed9befda159cd4a40
> Author: Simon Glass <sjg at chromium.org>
> Date:   Wed Nov 13 08:09:37 2024 -0700
>
>     env: Provide a work-around for unquoting fdtfile
>     
>     Some boards use a CONFIG option to specify the value of this variable.
>     This is normally handled by efi_get_distro_fdt_name() but in the case
>     of sunxi this does not work, since 'soc' is sunxi, but the files are
>     in the allwinner directory.
>     
>     Provide a work-around for this particular case.
>     
>     Signed-off-by: Simon Glass <sjg at chromium.org>
>     Reviewed-by: Tom Rini <trini at konsulko.com>
>
> As how to address this issue as well, unless someone discovers something
> still more clever to deal with quoting.

Thanks for the hint! So a quick and dirty stab at getting this to work:

diff --git a/Makefile b/Makefile
index 50737f93850..2e3280bb87b 100644
--- a/Makefile
+++ b/Makefile
@@ -2137,7 +2137,7 @@ quiet_cmd_gen_envp = ENVP    $@
                $(CPP) -P $(cpp_flags) -x assembler-with-cpp -undef \
                        -D__ASSEMBLY__ \
                        -D__UBOOT_CONFIG__ \
-                       -DDEFAULT_DEVICE_TREE=$(subst ",,$(CONFIG_DEFAULT_DEVICE_TREE)) \
+                       -DDEFAULT_FDT_FILE=$(subst ",,$(CONFIG_DEFAULT_FDT_FILE)) \
                        -I . -I include -I $(srctree)/include \
                        -include linux/kconfig.h -include include/config.h \
                        -I$(srctree)/arch/$(ARCH)/include \
diff --git a/board/sifive/unmatched/unmatched.env b/board/sifive/unmatched/unmatched.env
index 34425dc9efa..f309229481b 100644
--- a/board/sifive/unmatched/unmatched.env
+++ b/board/sifive/unmatched/unmatched.env
@@ -16,4 +16,4 @@ partitions=
     name=loader1,start=17K,size=1M,type=${type_guid_gpt_loader1};
     name=loader2,size=4MB,type=${type_guid_gpt_loader2};
     name=system,size=-,bootable,type=${type_guid_gpt_system};
-fdtfile=CONFIG_DEFAULT_FDT_FILE
+fdtfile=DEFAULT_FDT_FILE

Though obviously any boards relying on DEFAULT_DEVICE_TREE would need
adapting with my quick patch above...

I did not successfully just add -DDEFAULT_FDT_FILE without removing
-DDEFAULT_DEVICE_TREE ... probably just need to cut-and-paste more lines
in the Makefile... or try to do something even more clever. :)

That would also require the other handfull of boards using
CONFIG_DEFAULT_FDT_FILE to switch to DEFAULT_FDT_FILE, presumably.


I also tried switching the unmatched board to use DEFAULT_DEVICE_TREE
instead, but that does not contain the vendor prefix
(e.g. hifive-unmatched-a00 vs. sifive/hifive-unmatched-a00.dtb) and so
the file was still not found. Should CONFIG_DEFAULT_DEVICE_TREE and
CONFIG_DEFAULT_FDT_FILE both contain the vendor dir?


live well,
  vagrant
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