Date: Mon, 21 Dec 2020 23:05:53 -0600 From: "Brandon Bergren" <bdragon@FreeBSD.org> To: "FreeBSD PowerPC ML" <freebsd-ppc@freebsd.org> Subject: =?UTF-8?Q?Re:_Old_PowerMac_G5_2-socket/2-cores-each:_head_-r368820_kerne?= =?UTF-8?Q?l_reports:_bus=5Fdmamem=5Falloc_failed_to_align_memory_proper?= =?UTF-8?Q?ly?= Message-ID: <4b846361-8c15-46a1-8932-8769ca82f49b@www.fastmail.com> In-Reply-To: <c7cdeed2-57a7-4d48-91bd-4e0eb26c5313@www.fastmail.com> References: <FE22D733-35A2-4FB4-83D7-1E953A53AC34.ref@yahoo.com> <FE22D733-35A2-4FB4-83D7-1E953A53AC34@yahoo.com> <40dead6f-2a69-cf74-0a23-cde56dd90510@blastwave.org> <53f15d43-62c3-e12c-f8db-ede6a30e4e95@blastwave.org> <46726BE0-00FF-4DE7-835B-C7B04F3B0693@yahoo.com> <04727338-1ecb-4a94-c8e9-dcef7abd1513@blastwave.org> <c7cdeed2-57a7-4d48-91bd-4e0eb26c5313@www.fastmail.com>
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On Mon, Dec 21, 2020, at 11:02 PM, Brandon Bergren wrote: > > > On Mon, Dec 21, 2020, at 10:25 PM, Dennis Clarke via freebsd-ppc wrote: > > > > Well, I had to give it a try : > > > > https://beta.genunix.com/freebsd/ppc64/power_mac_quad_freebsd_13_current_17_dec_2020_fail.png > > > > Try the following in openfirmware before booting: > > dev /memory@0 100000 1000 do-unmap > > There are certain versions of OpenFirmware that leave a page mapped > with the wrong protections erroneously and this smells like that bug to > me. In fact, given the srr0 value in the fault, I am *certain* this is your problem. You can use nvedit to make this bugfix permanent for a given machine (We don't have our own guide, but the NetBSD guide @ https://www.netbsd.org/ports/macppc/nvedit.html is usable to apply this patch.) -- Brandon Bergren bdragon@FreeBSD.org
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