Messages in this thread | | | From | Bart Van Assche <> | Subject | Re: Regression in 4.11 - PowerPC crashes on boot, bisected to commit 5657933dbb6e | Date | Mon, 6 Mar 2017 18:02:33 +0000 |
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On Thu, 2017-03-02 at 16:14 +1100, Benjamin Herrenschmidt wrote: > On Wed, 2017-03-01 at 21:26 -0600, Larry Finger wrote: > > My Powerbook G4 Aluminum generates a fatal splat early in the boot process, just > > after identifying the driver for the disk. Unfortunately, it turns off almost > > immediately, thus I cannot report the message. After this bug has been > > triggered, the system clock has been reset to Dec. 31, 1969. I assume this is a > > side effect of an uncontrolled DMA operation. > > > > This problem has been bisected to commit 5657933dbb6e ("treewide: Move dma_ops > > from struct dev_archdata into struct device"). > > Side effect of a crash during boot... the PMU gets upset when we crash while > there's a request in flight, that's probably what is happening. > > As to why that commit is broken, I don't have time to look into it right now, > maybe next week of nobody beats me to it.
The results of my attempts so far to create a PPC VM: * I have not found a CPU / architecture / CD bus type / combination for which the Gentoo installation CD was able to recognize the boot medium (http://distfiles.gentoo.org/releases/ppc/autobuilds/20140713/install-powerpc-minimal-20140713.iso). * Same problem with the openSUSE Leap CD: apparently that software does not recognize the qemu SCSI CD (http://mirror.datto.com/opensuse/ports/ppc/distribution/leap/42.2/iso/openSUSE-Leap-42.2-NET-ppc64le-Build0156-Media.iso). * openSUSE Tumbleweed recognizes the qemu SCSI CD. After it has loaded the installation software however it displays an message reporting that an error occurred during installation and displays a menu. Making a selection from that menu is not possible because the only key from the keyboard it recognizes is "Enter" (http://mirror.datto.com/opensuse/ports/ppc/tumbleweed/iso/openSUSE-Tumbleweed-DVD-ppc64-Snapshot20170303-Media.iso).
Does anyone have a suggestion for how to proceed?
Thanks,
Bart.
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