[U-Boot] Riscv: CONFIG_DEFAULT_DEVICE_TREE failures

[Tom Rini <trini@konsulko.com>]

On Tue, Apr 02, 2019 at 03:16:10PM -0500, Troy Benjegerdes wrote:
> 
> > On Mar 31, 2019, at 5:02 PM, Tom Rini <trini@konsulko.com> wrote:
> > 
> > On Fri, Mar 29, 2019 at 11:15:48PM -0700, Troy Benjegerdes wrote:
> > 
> >> I attempted to merge in the latest master branch into
> >> https://github.com/sifive/u-boot/tree/sandbox and I got
> >> the following error, which seems somewhat broken..
> >> 
> >> 
> >> Device Tree Source is not correctly specified.
> >> Please define 'CONFIG_DEFAULT_DEVICE_TREE'
> >> or build with 'DEVICE_TREE=<device_tree>' argument
> >> 
> >> dts/Makefile:28: recipe for target 'arch/riscv/dts/fu540.dtb' failed
> >> 
> >> 
> >> Does anyone have any idea what would have caused that?
> >> 
> >> Also any feedback or pointers on why the serial_sifive.c 
> >> driver with CONFIG_DM_SERIAL would not work, but serial_hifive.c
> >> without CONFIG_DM_SERIAL does seem to work might be appreciated.
> > 
> > You'll need to do something like
> > 
> > commit 89c2b5c02049aea746b1edee0b4e1d8519dec2f4
> > Author: Masahiro Yamada <yamada.masahiro@socionext.com>
> > Date:   Thu Mar 14 14:58:33 2019 +0900
> > 
> >    ARM: fix arch/arm/dts/Makefile
> > 
> >    Since commit 27cb7300ffda ("Ensure device tree DTS is compiled"),
> >    build succeeds irrespective of the correctness of Makefile.
> > 
> >    In fact, you can compile any defconfig without adding any entry in
> >    arch/*/dts/Makefile.
> > 
> >    As a result, a lot of wrong code have been merged unnoticed.
> > 
> >    I am going to revert that commit, and lots of hidden issues have
> >    come to light:
> > 
> >    [1] Typos
> > 
> >      armada-3720-uDPU.dts, sun8i-a83t-tbs-a711.dts
> > 
> >      use the extension ".dts" instead of ".dtb"
> > 
> >    [2] DTB is associated to undefined CONFIG option
> > 
> >      For example, mx6sllevk_defconfig defines CONFIG_MX6SLL, but
> >      associates its device tree to CONFIG_MX6SL, which is undefined.
> > 
> >    [3] Lots of entries are missing
> > 
> >    Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
> >    Reviewed-by: Chris Packham <judge.packham@gmail.com>
> >    [trini: add imx6ul pico dtbs]
> >    Signed-off-by: Tom Rini <trini@konsulko.com>
> > 
> > But to arch/riscv/dts/Makefile
> 
> I ended up reverting that commit, and we now have
> https://github.com/sifive/u-boot/tree/sandbox booting to a prompt
> based on upstream master.

Note that you just need something like:
obj-y += first.dtb \
         second.dtb

-- 
Tom
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