On 9/3/20 10:40 AM, Dennis Gilmore wrote: > When testing builds provided in https://github.com/openwrt/openwrt/pull/3360 > I discovered that fdtfile was not set and as a result the firmware was not > functional. So I am documenting what is needed. > > Signed-off-by: Dennis Gilmore <den...@ausil.us> > > Cc: Atish Patra <atish.pa...@wdc.com> > Cc: Lukas Auer <lukas.a...@aisec.fraunhofer.de> > Cc: Tom Rini <tr...@konsulko.com> > Cc: Masahiro Yamada <yamada.masah...@socionext.com> > Cc: Vagrant Cascadian <vagr...@debian.org> > Cc: Stephen Warren <swar...@nvidia.com> > Cc: Karsten Merker <mer...@debian.org> > --- > doc/README.distro | 8 ++++++++ > 1 file changed, 8 insertions(+) > > diff --git a/doc/README.distro b/doc/README.distro > index 5076bebd18..3eb70aeb14 100644 > --- a/doc/README.distro > +++ b/doc/README.distro > @@ -224,6 +224,14 @@ fdt_addr_r: > > A size of 1MB for the FDT/DTB seems reasonable. > > +fdtfile: > + > + Mandatory. the name of the DTB file for the specific board for instance > + the espressobin v5 board the value is "marvell/armada-3720-espressobin.dtb" > + while on a clearfog pro it is "armada-388-clearfog-pro.dtb" in the case of > + a board providing its firmware based DTB this value can be used to override > + the DTB with a different DTB.
IIRC this variable isn't mandatory; if the DT filename follows expected ${soc}-${board}.dtb naming, then U-Boot has a default value that will work without the user or U-Boot author having to manually set this variable. So it's certainly mandatory that U-Boot know this value at runtime, but perhaps the text should be expanded to indicate that sometimes U-Boot can provide the value itself, but sometimes the variable needs to be set?