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Subject: Re: Stand-alone DTB build fails
From: Warner Losh <imp@bsdimp.com>
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Date: Fri, 25 Apr 2014 10:30:45 -0600
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To: Ron Brown <ron.brown@arcserv.com>
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On Apr 25, 2014, at 8:56 AM, Ron Brown <ron.brown@arcserv.com> wrote:
> The FreeBSD Wiki at https://wiki.freebsd.org/FlattenedDeviceTree =
refers to
> building a dtb in the following manner:
>=20
> --
> On platforms capable of running loader(8) the default scenario is to =
use
> a stand-alone DTB file, which is handled by the loader and handed =
over to
> kernel at boot time. In this approach, a DTB should be created at =
kernel
> build time:
>=20
> If FDT_DTS_FILE is specified in the kernel config file, the DTB is
> compiled automatically as part of the buildkernel stage. The user =
does
> not have to perform any explicit steps.
>=20
> If the default DTS file is not specified in the kernel config file, =
the
> DTB needs to be created separately by the user with the builddtb =
target:
>=20
> $ make builddtb FDT_DTS_FILE=3Dmpc8572ds.dts
> --
>=20
> However, this fails with:
> ERROR: Specified DTS File (zedboard.dts) does not exist!
>=20
> This is because /usr/src/Makefile.inc1 uses the MACHINE environment
> variable to find FDT_DTS_FILE:
>=20
> Starting at line 1836:
> if [ ! -f ${.CURDIR}/sys/boot/fdt/dts/${MACHINE}/${FDT_DTS_FILE} ]; =
...
> echo "ERROR: Specified DTS file (${FDT_DTS_FILE}) does not \
> exist!"; \
>=20
> MACHINE refers to the currently running system, however most of the =
ARM
> development is cross-compiled and the zedboard .dts resides in the =
dts/arm
> directory while MACHINE points if to the dts/amd64 directory.
> Should Makefile.inc1 instead refer to TARGET or something similar?
>=20
> if [ ! -f ${.CURDIR}/sys/boot/fdt/dts/${TARGET}/${FDT_DTS_FILE} ]; =
...
I think this is a mistake, but the make_dtb script also makes a similar
mistake (because it expects to be called from a different context). I=92ll=
sort this out and post a patch.
Warner