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On 12/21/06, Magnus Damm <magnus.damm at gmail.com> wrote: > On 12/22/06, Larry Brigman <larry.brigman at gmail.com> wrote: > > Trying to debug a problem and my understanding is dim. > > > > Is the entry that is presented to the kernel equal to > > the entry that one would get from readelf -h on a vmlinux compiled with > > a physical offset? > > On a vmlinux (2.6.19 to be more exact): > > So you have the startup_32 symbol in the kernel that you want to boot. > It should be in arch/i386/kernel/head.S. > > Then you have the linker script in arch/i386/kernel.vmlinux.lds.S > which sets ENTRY() to phys_startup_32 which is startup_32 - > PAGE_OFFSET ie the physical address of startup_32. > > Linux-2.6.19 is known to work to boot into on i386. Use that as a > secondary kernel to begin with and when you have that working you can > try booting older kernels. I have a small working serial console > config if you are interested. > > The kernel entry point is not everything though. You have purgatory > which is a glue layer in between the kernels. It is contained in the > kexec-tool and loaded and linked during runtime. > > So the entry point you will see in kexec (in your first kernel) will > most likely be the entry point of purgatory. It took me a while to > figure that out and now I have mixed feelings about purgatory... =) > > / magnus > What should the i386 entry value be on the kexec_load call on i386 if the CONFIG_PHY_START = 0x1000000 for the crash dump kernel Without debug on I get 0x1498 with caused the kernel to reject the load. I think I am finding a silent failure in the kexec code. I turned on debug in the kexec code and get a different error. unable to open /sys/devices/system/cpu/cpu0/crash_notes I think that this is one of two things. I don't have crash dump turned on in the first kernel or I missed the section in the sysfs that adds thje crash_notes section. Have to wait until tomorrow to figure it out.
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