mixmid
commented
2 years ago armbian login: [ 234.915496] kvm: exiting hardware virtualization [ 234.952516] pwrseq_simple sdio-pwrseq: Turning off mmc [ 234.955323] kexec_core: Starting new kernel [ 234.971860] Bye!
This part was solved by increasing crashkernel=512M in the kernel command line. See it:
[ 347.695632] SMP: stopping secondary CPUs
[ 347.699559] Starting crashdump kernel...
[ 347.703390] Bye!
[ 0.000000] Booting Linux on physical CPU 0x0000000100 [0x411fd050]
[ 0.000000] Linux version 5.15.59-mxdbg (root@ed84223eb023) (clang version 14.0.0, LLD 14.0.0) #8 SMP PREEMPT Sun Aug 7 15:40:07 MSK 2022
[ 0.000000] random: crng init done
[ 0.000000] Machine model: AMedia X96 Max+
[ 0.000000] efi: UEFI not found.
[ 0.000000] Reserved memory: created CMA memory pool at 0x00000000d0400000, size 256 MiB
[ 0.000000] OF: reserved mem: initialized node linux,cma, compatible id shared-dma-pool
[ 0.000000] OF: fdt: elfcorehdr is overlapped
Look to kdumps:
root@armbian:/var/crash/202208301753# ls -l
total 45912
-rw------- 1 root root 40843 Aug 30 17:53 dmesg.202208301753
-rw-r--r-- 1 root root 46969389 Aug 30 17:53 dump.202208301753
Preface
A friend of mine brought this tv box "X96 Max+" complaining of kernel panics the device catches when runs in the pure Linux mode not Android. I successfully used kdump on my Raspberry Pi 4 to debug kernel panics. But i still cannot run kdump & kexec on this Amlogic device, but first things first.
Main part
The full name of the tv box is Droidlogic X96Max_Plus2_T and the ethernet chip is Realtek RTL8211F as it's seen on Android by Device Info HW app. Device is Amlogic s905x3, kernel 5.15.60 (compiled with debug info)
I used meson-sm1-x96-max-plus-100m.dtb after installation and the triple of:
meson-sm1-hk1box-vontar-x3.dtb meson-sm1-x96-max-plus-100m.dtb *meson-sm1-x96-max-plus.dtb
and
dd if=/tmp/hk1box-bootloader.img of=/dev/mmcblk0 bs=1 count=442 dd if=/tmp/hk1box-bootloader.img of=/dev/mmcblk0 bs=512 skip=1 seek=1
and after all meson-sm1-x96-max-plus.dtb from flippy's post at ->
https://forum.armbian.com/topic/15376-methods-to-fix-x96-max-pluss905x3-gigabit-ethernet-problem.
Now that the device enters kexec reboot only with the flag 'kexec -s'
kexec -l /var/lib/kdump/vmlinuz --initrd=/var/lib/kdump/initrd.img --dtb=/boot/dtb/amlogic/meson-sm1-x96-max-plus.dtb --reuse-cmdline -sEthernet part
The First issue is that after kexec reboot ethernet doesn't work, but wi-fi works good. The normal boot of ethernet:
After a kexec reboot:
The second issue is that the second kernel for kdump doesn't start, it just stops after these lines:
armbian login: [ 234.915496] kvm: exiting hardware virtualization [ 234.952516] pwrseq_simple sdio-pwrseq: Turning off mmc [ 234.955323] kexec_core: Starting new kernel [ 234.971860] Bye!
I think this post belongs to the topic of kernel debugging. Thanks in advance.