Re: Kexec couldn't reboot capture kernel on pandaboard ES with OMAP4460
On 04/12/2013 04:45 AM, Will Deacon wrote: ... > Back to the SMP point: Stephen, did you ever get anywhere with that > disable_nonboot_cpus thread from a few months back? I'm still keen to get > that working, and I *thought* we had a potential solution... No, I've been side-tracked on too many other things to follow up on that:-( -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: Kexec couldn't reboot capture kernel on pandaboard ES with OMAP4460
On Thu, Apr 11, 2013 at 05:19:21PM +0100, Stephen Warren wrote: > On 04/10/2013 10:46 PM, Li Haifeng wrote: > > 2013/4/10 Stephen Warren : > >> On 04/10/2013 03:35 AM, Li Haifeng wrote: > >>> Hi, everyone. > >>> > >>> Recently, I try to run kdump on pandaboard ES with omap4460. After > >>> load capture kernel by "kexec -l" and execute "kexec -e", the serial > >>> port output "Starting new kernel" and "Bye", then the system hangs up. > >>> > >>> I have tried the upstream Linux Kernel v3.4 and v3.8. All are with this > >>> issue. > >> > >> This is a shot in the dark. I assume you have SMP enabled. Can you use > >> hotplug to remove all CPUs other than CPU0, so that the kexec happens on > >> the boot CPU? That is certainly necessary for kexec to work correctly on > >> Tegra. > > > > Thanks for your attention. > > > > I do disable SMP feature. And the .config file for v3.8 could be found here: > > http://pastehtml.com/view/cylyrfejt.txt > ... > > The output: > > [ 57.373687] Starting new kernel > > [ 57.377044] Bye! > > > > Then system hangs. > > Oh well, you've exhausted my knowledge I'm afraid! I can only suggesting > trying to enable earlyprintk and/or uncompressor debug in the kernel > you're kexec'ing and see if that yields any clue. Either that, or JTAG! Also worth using the bleeding edge kexec-tools (i.e. build from source), especially if you want to anything device-tree related. Back to the SMP point: Stephen, did you ever get anywhere with that disable_nonboot_cpus thread from a few months back? I'm still keen to get that working, and I *thought* we had a potential solution... Will -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: Kexec couldn't reboot capture kernel on pandaboard ES with OMAP4460
On 04/10/2013 10:46 PM, Li Haifeng wrote: > 2013/4/10 Stephen Warren : >> On 04/10/2013 03:35 AM, Li Haifeng wrote: >>> Hi, everyone. >>> >>> Recently, I try to run kdump on pandaboard ES with omap4460. After >>> load capture kernel by "kexec -l" and execute "kexec -e", the serial >>> port output "Starting new kernel" and "Bye", then the system hangs up. >>> >>> I have tried the upstream Linux Kernel v3.4 and v3.8. All are with this >>> issue. >> >> This is a shot in the dark. I assume you have SMP enabled. Can you use >> hotplug to remove all CPUs other than CPU0, so that the kexec happens on >> the boot CPU? That is certainly necessary for kexec to work correctly on >> Tegra. > > Thanks for your attention. > > I do disable SMP feature. And the .config file for v3.8 could be found here: > http://pastehtml.com/view/cylyrfejt.txt ... > The output: > [ 57.373687] Starting new kernel > [ 57.377044] Bye! > > Then system hangs. Oh well, you've exhausted my knowledge I'm afraid! I can only suggesting trying to enable earlyprintk and/or uncompressor debug in the kernel you're kexec'ing and see if that yields any clue. Either that, or JTAG! -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: Kexec couldn't reboot capture kernel on pandaboard ES with OMAP4460
2013/4/10 Stephen Warren : > On 04/10/2013 03:35 AM, Li Haifeng wrote: >> Hi, everyone. >> >> Recently, I try to run kdump on pandaboard ES with omap4460. After >> load capture kernel by "kexec -l" and execute "kexec -e", the serial >> port output "Starting new kernel" and "Bye", then the system hangs up. >> >> I have tried the upstream Linux Kernel v3.4 and v3.8. All are with this >> issue. > > This is a shot in the dark. I assume you have SMP enabled. Can you use > hotplug to remove all CPUs other than CPU0, so that the kexec happens on > the boot CPU? That is certainly necessary for kexec to work correctly on > Tegra. Thanks for your attention. I do disable SMP feature. And the .config file for v3.8 could be found here: http://pastehtml.com/view/cylyrfejt.txt The log and operation could be found here: http://pastehtml.com/view/cylyfrb3a.txt Some key setting list below. bootargs: rw vram=32M fixrtc mem=1G@0x8000 root=/dev/mmcblk0p2 console=ttyO2,115200n8 rootwait crashkernel=64M@0x8200 operation: / # ./kexec -l --append="rw vram=32M fixrtc root=/dev/mmcblk0p2 console=ttyO2, 115200n8 rootwait" uImage / # ./kexec -d -e The output: [ 57.373687] Starting new kernel [ 57.377044] Bye! Then system hangs. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
