Date: Wed, 25 Jan 2012 11:44:21 +0200 From: Dirk Kotze <dk@Nanoteq.com> To: "'freebsd-questions@freebsd.org'" <freebsd-questions@freebsd.org> Subject: RE: Makeopts DEBUG=-g kernel option Message-ID: <F46C10D2F60F034BB106EAB4CD7E833C7A463EFBCD@ntq-ex.nanoteq.co.za> In-Reply-To: <F46C10D2F60F034BB106EAB4CD7E833C7A463EFBBF@ntq-ex.nanoteq.co.za> References: <F46C10D2F60F034BB106EAB4CD7E833C7A463EFBBF@ntq-ex.nanoteq.co.za>
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--_002_F46C10D2F60F034BB106EAB4CD7E833C7A463EFBCDntqexnanoteqc_ Content-Type: text/plain; charset="iso-8859-1" content-transfer-encoding: quoted-printable Hi again Just some feedback - it seems that I have isolated the problem below with th= e help of a 2005 post by John Nielsen to freebsd-questions (http://lists.fre= ebsd.org/pipermail/freebsd-sparc64/2005-August/003423.html). I have isolated the problem as being caused by the compiler optimization fla= gs, specifically the "-O2 -pipe" flags (the default flags used when "makeopt= ions DEBUG=3D-g" is not specified in the kernel configuration). I have pro= ved that the DEBUG flag per se has nothing to do with it by removing it, and= then adding makeoptions COPTFLAGS=3D"-O -pipe" to the kernel config. This= boots fine. Funny though, the exact original kernel used (without DEBUG and compiled wit= h -O2) works fine on other hardware (e.g. the Tyan Tank G20 B5211 motherboar= d with an Intel Core2Duo CPU). It only fails on the WADE-8020 board. It mus= t be some specific hardware driver used on the WADE-8020 motherboard that br= eaks when compiled with -O2. If anyone has suggestions as to how I can trace the problem further (so that= I can log a bug with the BSD community), this will be appreciated. Hopeful= ly I can ensure that a future user does not struggle with the same problem I= did. As always, thanks for the help. Regards, Dirk Kotze Developer > From: Dirk Kotze > Sent: Monday, January 23, 2012 4:27 PM > To: 'freebsd-questions@freebsd.org' > Subject: Makeopts DEBUG=3D-g kernel option > > Hi there > > I'm experiencing the following problem: All is well when I boot the standa= rd FreeBSD 8.2 GENERIC kernel.=A0 The moment > however when I comment out the line the line below, the kernel hangs upon= boot after detecting the em0 device (the > motherboard has 2 Intel 8257x dual Gigabit Ethernet cards). > makeopts=A0=A0 DEBUG=3D-g > > I'm using FreeBSD 8.2 on a WADE-8020 motherboard with an Intel QM57 chipse= t and Intel Core i5 CPU.=A0 > > The reason I'm trying to remove debugging options from the kernel is that= I am trying to make the kernel footprint > smaller. > > This leaves me with a few questions: > 1) What are the risks/drawbacks/advantages of leaving debugging symbols in= the kernel? > 2) Why would debug symbols (of all things!) make the difference between a= working and non-working kernel? > 3) Does this point in the direction of some other (more serious problem pe= rhaps?) with the hardware and/or other > kernel drivers? > > Thanks so much for any assistance. > > Regards, > Dirk Kotze > Developer > > >=A0=A0=A0=A0=A0=A0=A0 =A0Tel: +27 12 672 7281 > Fax: +27 12 665 1343 > Postal: P.O. Box 7991, Centurion, 0046 > Physical: 1 Pieter street, Highveld Park, Centurion > Important Notice:=0A= =0A= This e-mail and its contents are subject to the Nanoteq (Pty) Ltd e-mail leg= al notice available at:=0A= http://www.nanoteq.com/corp_profile/disclaimer.asp Important Notice: This e-mail and its contents are subject to the Nanoteq (Pty) Ltd e-mail legal notice available at: http://www.nanoteq.com/corp_profile/disclaimer.asp --_002_F46C10D2F60F034BB106EAB4CD7E833C7A463EFBCDntqexnanoteqc_ Content-Type: text/plain; name="AVG Certification.txt" Content-Description: AVG Certification.txt Content-Disposition: attachment; filename="AVG Certification.txt"; size=92; creation-date="Wed, 25 Jan 2012 09:44:22 GMT"; modification-date="Wed, 25 Jan 2012 09:44:22 GMT" Content-Transfer-Encoding: base64 VGhlIG1lc3NhZ2UgZG9lcyBub3QgY29udGFpbiBhbnkgdGhyZWF0cw0KQVZHIGZvciBNUyBFeGNo YW5nZSBTZXJ2ZXIgKDEwLjAuMTQxNiAtIDIxMDkvNDc1Nik= --_002_F46C10D2F60F034BB106EAB4CD7E833C7A463EFBCDntqexnanoteqc_--
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