ning

does your board booted with old version images? if not please check power supply.

or if display driver is using DRM, maybe /sys/class/drm/ could help you. if display driver is framebuffer, no much info from /sys/class/graphics/

try xrandr ? or if you know how to use libdrm, you can write your own cmd.

https://forum.armbian.com/topic/8933-warninglegacy-image-failed-to-start-sshd-after-system-upgrade/?tab=comments#comment-66872

due to systemd updates to a new version, maybe it's not compact with old kernel. after system upgrade, it fails to start sshd. after read code, insystemd-tmpfile chase_symlinks() return -EBADF from kernel, I guess legacy kernel not compact with newer systemd.

@tommy@guidol thank you.

done, power adapter is broken.

when system booting to userspace, we can see a voltage drop, about 1.5V. but when I add "rdinit=/bin/sh", system works fine. next setp I will find a DC power supply, and which GPIO pin is for power supply? pin4? pin2?

@guidol new armbian image from https://www.armbian.com/download/

[ 6.332071] Unable to handle kernel paging request at virtual address af034574 address lower than C0000000 is userspace virtual address, why kernel will request userspace address? I guess memory is broken. or power supply around memory chip is not stable. still need to check power. does anyone know how to check power supply for DDR?

[ 6.004762] random: systemd-udevd: uninitialized urandom read (16 bytes read) [ 6.011085] random: udevadm: uninitialized urandom read (16 bytes read) [ 6.012778] random: udevadm: uninitialized urandom read (16 bytes read) [ 6.332071] Unable to handle kernel paging request at virtual address af034574 [ 6.339293] pgd = c9c68000 [ 6.342013] [af034574] *pgd=00000000 [ 6.345592] Internal error: Oops: 5 [#1] SMP THUMB2 [ 6.350462] Modules linked in: [ 6.353518] CPU: 3 PID: 148 Comm: systemd-udevd Not tainted 4.14.78-sunxi #412 [ 6.360728] Hardware name: Allwinner sun8i Family [ 6.365426] task: ef162700 task.stack: c9c64000 [ 6.369959] PC is at lock_page_memcg+0x10/0x60 [ 6.374401] LR is at page_add_file_rmap+0xf/0x88 [ 6.379012] pc : [<c021ce1c>] lr : [<c0206863>] psr: 60060133 [ 6.385268] sp : c9c65db8 ip : 000105df fp : 0000000d [ 6.390484] r10: c9c65e54 r9 : 00000000 r8 : ee156000 [ 6.395702] r7 : 00000000 r6 : efff5d34 r5 : c9c65e54 r4 : af034400 [ 6.402218] r3 : efff5d34 r2 : 00000001 r1 : 00000000 r0 : efff5d34 [ 6.408737] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA Thumb Segment none [ 6.416035] Control: 50c5387d Table: 49c6806a DAC: 00000051 [ 6.421772] Process systemd-udevd (pid: 148, stack limit = 0xc9c64210) [ 6.428289] Stack: (0xc9c65db8 to 0xc9c66000) [ 6.432641] 5da0: efff5d34 c9c65e54 [ 6.440810] 5dc0: efff5d34 c0206863 7fe2559f c01fffa1 ffece28c 00000000 ee8d75a0 efff5d34 [ 6.448978] 5de0: c0d03f48 ee8d55f4 0000000b c9c65e54 0000000d c01d742d 0000000a ee0a40c0 [ 6.457147] 5e00: effde1cc 0000000b 00000040 00000040 ee8d7560 28de9f60 00000000 0000000d [ 6.465315] 5e20: b6e98000 c0d03f48 00000040 c01d71f9 b6e9e000 c9c65e54 00000000 c02007d3 [ 6.473484] 5e40: eec04770 c0a703ac 00080040 00080060 00000010 ee156000 00000054 014200c2 [ 6.481652] 5e60: 00000006 b6ea3000 c9c6adb8 c9c6adb8 00000000 00000000 00000000 00000000 [ 6.489821] 5e80: ffece28c effde1e8 00000000 28de9f60 b6e9e794 c9c65fb0 ef162700 ee0d5880 [ 6.497990] 5ea0: 80000007 b6e9e794 00000054 ee0d58bc ee156000 c0110b75 ee4eb2c0 00000010 [ 6.506158] 5ec0: 00000002 00000040 00000000 00000000 00000000 c9c65ed8 ef6d91f8 c0d03f48 [ 6.514327] 5ee0: c0d096f4 00000007 c0110a9d b6e9e794 c9c65fb0 beb7f878 00461110 c01012e9 [ 6.522495] 5f00: ffffffff 0137adc0 ee546000 00000000 c0d04578 00000002 ffffff9c 00000000 [ 6.530664] 5f20: c9c65f58 28de9f60 0137adc0 0137adc0 beb7fe48 00000000 00000000 c9c65f68 [ 6.538832] 5f40: c9c65f58 c023579f c9c65f68 c9c65f58 c0d03f48 00000000 00000000 00000000 [ 6.547001] 5f60: 00000000 28de9f60 013778a0 ffffe000 00000000 c9c65fb0 c9c65f90 28de9f60 [ 6.555169] 5f80: c9c64000 0137adc0 beb7fe48 28de9f60 0000000a b6e9e794 60060030 ffffffff [ 6.563338] 5fa0: 50c5387d 50c5387d 00000000 c010ac3b 0136e090 beb7fab6 beb7f878 0046195c [ 6.571506] 5fc0: beb7fab6 beb7fab6 0136fb88 beb7f8b4 00461110 00000000 beb7f878 00461110 [ 6.579674] 5fe0: 00460f98 beb7f850 0043c291 b6e9e794 60060030 ffffffff 00000000 00000000 [ 6.587856] [<c021ce1c>] (lock_page_memcg) from [<c0206863>] (page_add_file_rmap+0xf/0x88) [ 6.596115] [<c0206863>] (page_add_file_rmap) from [<c01fffa1>] (alloc_set_pte+0x99/0x248) [ 6.604375] [<c01fffa1>] (alloc_set_pte) from [<c01d742d>] (filemap_map_pages+0x235/0x258) [ 6.612633] [<c01d742d>] (filemap_map_pages) from [<c02007d3>] (handle_mm_fault+0x61f/0x8b4) [ 6.621063] [<c02007d3>] (handle_mm_fault) from [<c0110b75>] (do_page_fault+0xd9/0x230) [ 6.629061] [<c0110b75>] (do_page_fault) from [<c01012e9>] (do_PrefetchAbort+0x39/0x88) [ 6.637058] [<c01012e9>] (do_PrefetchAbort) from [<c010ac3b>] (__pabt_usr+0x5b/0x5c) [ 6.644788] Exception stack(0xc9c65fb0 to 0xc9c65ff8) [ 6.649834] 5fa0: 0136e090 beb7fab6 beb7f878 0046195c [ 6.658003] 5fc0: beb7fab6 beb7fab6 0136fb88 beb7f8b4 00461110 00000000 beb7f878 00461110 [ 6.666170] 5fe0: 00460f98 beb7f850 0043c291 b6e9e794 60060030 ffffffff [ 6.672779] Code: f3af 8000 6a04 b1cc (f8d4) 3174 [ 6.677579] ---[ end trace eb14348a8ad35870 ]---

finally, I can set loglevel to 7 and get detail error: [ 6.005126] random: systemd-udevd: uninitialized urandom read (16 bytes read) [ 6.011337] random: udevadm: uninitialized urandom read (16 bytes read) [ 6.013059] random: udevadm: uninitialized urandom read (16 bytes read) [ 6.329864] Bad mode in data abort handler detected [ 6.334753] Internal error: Oops - bad mode: 0 [#1] SMP THUMB2 [ 6.340577] Modules linked in: [ 6.343634] CPU: 2

I use this power adapter, if it is power supply issue, can I use 2 power supply at same time? power adapter + USB supply? I have tried 2 sdcards, legacy and next images. still can't more logs from console.

thanks @tommy I will try this way, but I use 5V power supply provided by Xunlong, the board maker. maybe it's broken. and how could I print more logs to console? I have already modified loglevel to 7, but nothing more, I think they are printed to some other console, right?

OK, I use wrong pins for console, after use right one, I get below info from console: switch to partitions #0, OK mmc0 is current device Scanning mmc 0:1... Found U-Boot script /boot/boot.scr 3708 bytes read in 13 ms (278.3 KiB/s) ## Executing script at 43100000 U-boot loaded from SD Boot script loaded from mmc 154 bytes read in 10 ms (14.6 KiB/s) 5218884 bytes read in 267 ms (18.6 MiB/s) 4654496 bytes read in 242 ms (18.3 MiB/s) Found legacy kernel configuration 34984 bytes read in 42 ms (812.5 KiB/s) ## Loading init Ramdisk from Legacy Image at 43300000 ... Image Name: uInitrd Image Type: ARM Linux RAMDisk Image (gzip compressed) Data Size: 5218820 Bytes = 5 MiB Load Address: 00000000 Entry Point: 00000000 Verifying Checksum ... OK Starting kernel ... [sun8i_fixup]: From boot, get meminfo: Start: 0x40000000 Size: 1024MB ion_carveout reserve: 160m@0 256m@0 130m@1 200m@1 ion_reserve_select: ion chipid [0x2c00081! ion_reserve_common: ion reserve: [0x50000000, 0x60000000]! Loading, please wait... starting version 229 <<== stopped... I will try new sdcard.