From owner-freebsd-bugs@freebsd.org Thu Jan 19 13:51:59 2017 Return-Path: Delivered-To: freebsd-bugs@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 95E38CB7D8D for ; Thu, 19 Jan 2017 13:51:59 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2001:1900:2254:206a::16:76]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 859661389 for ; Thu, 19 Jan 2017 13:51:59 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from bugs.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id v0JDpxB3023078 for ; Thu, 19 Jan 2017 13:51:59 GMT (envelope-from bugzilla-noreply@freebsd.org) From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 216123] ofwfb: r269278 broke booting on Power Mac G4 Date: Thu, 19 Jan 2017 13:51:59 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: CURRENT X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Some People X-Bugzilla-Who: tgl@sss.pgh.pa.us X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: freebsd-bugs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: attachments.created Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 19 Jan 2017 13:51:59 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D216123 --- Comment #8 from Tom Lane --- Created attachment 179069 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D179069&action= =3Dedit Minimum part of reverting r269278 to get CURRENT to boot I've not had any luck bringing a kernel debugger to bear, but I've experime= nted with the r269278 patch some more, and I can report that the portions attach= ed to this comment are the minimum needed to make it work. Without the seemingly-superfluous OF_open call in ofwfb_initialize, it freezes during b= oot in the way previously described. If the set-depth method call isn't removed from ofwfb_init, it boots but the screen display is completely messed up --- looks like it has the wrong idea about the framebuffer stride. I'm not sure what to make of this. I do not understand the division of lab= or between ofwfb_initialize and ofwfb_init, nor what the intended call sequence is, but I sort of suspect that the actual call sequence is different from w= hat the code's author expected. Obviously, this is still not a committable patch; the "extra" OF_open call might be safe enough, but removing the set-depth call would presumably represent a loss on better hardware. But perhaps this will give somebody an idea of what to pursue. --=20 You are receiving this mail because: You are the assignee for the bug.=