Date: Wed, 30 Aug 2006 16:36:45 -0700 From: "David Christensen" <davidch@broadcom.com> To: "Stefan Bethke" <stb@lassitu.de> Cc: freebsd-current@freebsd.org Subject: RE: Simplified Steps for Building a Loadable module on -CURRENT Message-ID: <09BFF2FA5EAB4A45B6655E151BBDD90301E2F2C1@NT-IRVA-0750.brcm.ad.broadcom.com> In-Reply-To: <989384AE-60BB-4A37-B240-02DE1CEE4E4C@lassitu.de>
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> > I've been able to successfully build drivers in the past as > > loadable modules but I'm getting some kernel panics with -CURRENT > > when installing a module using kldload now where things used to > > work before. >=20 > You did nuke /usr/obj, performed a full kernel build (cd /usr/src; =20 > make buildkernel installkernel), and the module in question that was =20 > installed alongside your new kernel is *not* panicking the system? Yes >=20 > Then what's the panic message, and how exactly are you building your =20 > module? >=20 The message wasn't readable on the serial console. The text was jumbled and I could only make out bits and pieces of it. > > Assume I'm a complete FreeBSD noob for a moment > > (which really isn't that far from the truth) and I want to build > > a driver as a loadable module for testing. After moving to > > the appropriate directory in the source tree (/usr/src/sys/dev/XXX), > > what steps do I need to follow to build the driver as a module? >=20 > That would be /usr/src/sys/modules/<modulename> >=20 > So far, just running make there has worked for me just fine. >=20 Ah, there's the simple piece I was missing! I had previously created my own Makefile and placed it in the /usr/src/sys/dev/XXX directory. > > Assume for the moment that I have already commented the driver out > > of my kernel configuration file > > (/usr/src/sys/<architecture>/conf/GENERIC) > > and rebuilt and installed that kernel. >=20 > If the driver has been compiled into the kernel, kldload will error =20 > out with EEXISTS. If the system panics, you should provide specifics. >=20 So I should do the following: 1) Comment out the driver I want to test in the kernel configuration file. For example, modify /usr/src/sys/amd64/conf/MYCONFIG. 2) Rebuild and install the kernel (cd /usr/src; make kernel KERNCONF=3DMYCONFIG) 3) Reboot the system to start using the new kernel 4) Edit the driver in /usr/src/sys/dev/XXX as necessary 5) Build the kernel module (cd /usr/src/sys/modules/XXX; make) 6) Load the kernel module (kldload ./if_XXX) and cross my fingers.
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