From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Subject: Re: [PATCH 1/8] pseries: phyp dump: Docmentation From: Michael Ellerman To: linasvepstas@gmail.com In-Reply-To: <3ae3aa420801092012m5e47cbd7lc7a5f91842074af7@mail.gmail.com> References: <4782B985.2090508@austin.ibm.com> <4782C026.8080302@austin.ibm.com> <20080109042911.GT14201@localdomain> <3ae3aa420801090731r2e25e42awcae385b448e20b16@mail.gmail.com> <20080109184437.GU14201@localdomain> <3ae3aa420801091833i6cf32616o2a060579be1f3191@mail.gmail.com> <20080110031723.GA22168@lixom.net> <3ae3aa420801092012m5e47cbd7lc7a5f91842074af7@mail.gmail.com> Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="=-4gEKaI/k4aiRac3zX06v" Date: Thu, 10 Jan 2008 15:52:31 +1100 Message-Id: <1199940751.7880.34.camel@concordia> Mime-Version: 1.0 Cc: linuxppc-dev@ozlabs.org, lkessler@us.ibm.com, mahuja@us.ibm.com, Nathan Lynch , Olof Johansson , strosake@us.ibm.com Reply-To: michael@ellerman.id.au List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , --=-4gEKaI/k4aiRac3zX06v Content-Type: text/plain Content-Transfer-Encoding: quoted-printable On Wed, 2008-01-09 at 22:12 -0600, Linas Vepstas wrote: > On 09/01/2008, Olof Johansson wrote: > > On Wed, Jan 09, 2008 at 08:33:53PM -0600, Linas Vepstas wrote: > > > > > Heh. That's the elbow-grease of this thing. The easy part is to get > > > the core function working. The hard part is to test these various con= figs, > > > and when they don't work, figure out what went wrong. That will take > > > perseverence and brains. > > > > This just sounds like a whole lot of extra work to get a feature that > > already exists. >=20 > Well, no. kexec is horribly ill-behaved with respect to PCI. The > kexec kernel starts running with PCI devices in some random > state; maybe they're DMA'ing or who knows what. kexec tries > real hard to whack a few needed pci devices into submission > but it has been hit-n-miss, and the source of 90% of the kexec > headaches and debugging effort. Its not pretty. Isn't that what EEH and the IOMMU are for? :) cheers --=20 Michael Ellerman OzLabs, IBM Australia Development Lab wwweb: http://michael.ellerman.id.au phone: +61 2 6212 1183 (tie line 70 21183) We do not inherit the earth from our ancestors, we borrow it from our children. - S.M.A.R.T Person --=-4gEKaI/k4aiRac3zX06v Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) iD8DBQBHhaSPdSjSd0sB4dIRAowrAJ9qGc+rVNzzemi8zRITbVnb2Zn9mwCgvatJ oG8jjuCplQ5GZ6tMSzIftI0= =qqpY -----END PGP SIGNATURE----- --=-4gEKaI/k4aiRac3zX06v--