Date: Fri, 5 Aug 2016 20:20:11 -0700 From: Adrian Chadd <adrian.chadd@gmail.com> To: ticso@cicely.de Cc: "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org>, Bernd Walter <ticso@cicely7.cicely.de> Subject: Re: out of tree kernel modules (was: compiling modules and FDT define) Message-ID: <CAJ-VmonNG1XycPWUH%2BrrpcKBUKH8R6u_aD=odmbPB17r8UyM0A@mail.gmail.com> In-Reply-To: <20160805134358.GN18406@cicely7.cicely.de> References: <20160805005433.GL18406@cicely7.cicely.de> <20160805134358.GN18406@cicely7.cicely.de>
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Hi,
Try adding opt_platform.h to SRCS in the module makefile?
You don't need to add it to the tree. You just have to setup your path
to point things /at/ a kernel build tree withall the opt_xxx.h in
them.
here's what I do:
#!/bin/sh
X_SRCDIR=${X_SRCDIR:="/home/adrian/work/freebsd/head/src/"}
X_KERNDIR=${X_KERNDIR:="/home/adrian/work/freebsd/head/obj/usr/home/adrian/work/freebsd/head/src/sys/GERTRUDE/"}
X_KMODOWN=${X_KMODOWN:="adrian"}
X_KMODGRP=${X_KMODGRP:="adrian"}
# This allows for -HEAD includes for net80211 ..
env CFLAGS="-I../../../sys/" \
make \
MODULES_OVERRIDE="" \
DEBUG_FLAGS="-g" \
DEBUG_FLAGS="-g" \
KMODDIR="/home/adrian/git/github/erikarn/athp/otus/freebsd/modules/" \
KMODOWN="${X_KMODOWN}" \
KMODGRP="${X_KMODGRP}" \
MAKESYSPATH="${X_SRCDIR}/share/mk" \
SYSDIR="${X_SRCDIR}/sys/" \
KERNBUILDDIR="${X_KERNDIR}" \
KERN_DEBUGDIR="" \
$@
That gets me all the bits I need to be able to run make in module
directories and get the correct includes/links setup.
-a
On 5 August 2016 at 06:43, Bernd Walter <ticso@cicely7.cicely.de> wrote:
> On Fri, Aug 05, 2016 at 02:54:34AM +0200, Bernd Walter wrote:
>> I compile a driver as module and it seems that FDT isn't defined
>> on a rpi.
>
> When compiling kernel with modules you get an opt_platform.h containing
> #define FDT 1
>
> For my out of tree module all I get is an empty file.
> I assume that also happens when you just manually compile anything in
> sys/modules.
>
> Do I really need to integrate the driver into the kernel source tree
> and always compile everything?
>
> The symptoms of missing FDT support is subtile, because everything
> may seem to work, the device probing just accepts more devices than
> it is supposed to handle.
>
> On a side note, the ofw_bus_is_compatible and ofw_bus_search_compatible
> functions are undocumented.
> At least they don't have a manpage.
> My only option was to blindly copy from another driver, without really
> understanding the differences between those two functions.
>
> --
> B.Walter <bernd@bwct.de> http://www.bwct.de
> Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.
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