imx8mm evk stucks in boot loop

vaaa · ‎09-19-2020

I tried to boot imx8mm from sd card using u-boot and linux image.

At first everything looks fine, it seems that linux image is booting. But at some point booting process just stucks and then booting starts again. No error displayed.

Here is the logs from debug terminal:

Can anyone please give a clue why board stucks in boot loop?

CPU: Freescale i.MX8MMQ rev1.0 at 1200 MHz
Reset cause: POR
Model: FSL i.MX8MM EVK board
DRAM: 2 GiB
WDT: Started with servicing (60s timeout)
MMC: FSL_SDHC: 1, FSL_SDHC: 2
Loading Environment from MMC... *** Warning - bad CRC, using default environment

In: serial
Out: serial
Err: serial
Net: eth0: ethernet@30be0000
Hit any key to stop autoboot: 0
switch to partitions #0, OK
mmc1 is current device
Failed to load 'boot.scr'
20836864 bytes read in 893 ms (22.3 MiB/s)
Booting from mmc ...
41463 bytes read in 14 ms (2.8 MiB/s)
## Flattened Device Tree blob at 43000000
Booting using the fdt blob at 0x43000000
Loading Device Tree to 000000004fff2000, end 000000004ffff1f6 ... OK

Starting kernel ...

[ 0.000000] Booting Linux on physical CPU 0x0
[ 0.000000] Linux version 4.9.123-05524-g6a71cbc (vahag@ararat) (gcc version 5.4.0 20160609 (Ubuntu/Linaro 5.4.0-6u
buntu1~16.04.9) ) #1 SMP PREEMPT Wed Sep 16 19:08:51 +04 2020
[ 0.000000] Boot CPU: AArch64 Processor [410fd034]
[ 0.000000] efi: Getting EFI parameters from FDT:
[ 0.000000] efi: UEFI not found.
[ 0.000000] Reserved memory: created CMA memory pool at 0x0000000078000000, size 640 MiB
[ 0.000000] OF: reserved mem: initialized node linux,cma, compatible id shared-dma-pool
[ 0.000000] psci: probing for conduit method from DT.
[ 0.000000] psci: PSCIv1.1 detected in firmware.
[ 0.000000] psci: Using standard PSCI v0.2 function IDs
[ 0.000000] psci: MIGRATE_INFO_TYPE not supported.
[ 0.000000] psci: SMC Calling Convention v1.1
[ 0.000000] percpu: Embedded 22 pages/cpu @ffff80007ff65000 s50200 r8192 d31720 u90112
[ 0.000000] Detected VIPT I-cache on CPU0
[ 0.000000] CPU features: enabling workaround for ARM erratum 845719
[ 0.000000] Speculative Store Bypass Disable mitigation not required
[ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 515072
[ 0.000000] Kernel command line: console=ttymxc1,115200 root=/dev/mmcblk1p2 rootwait rw
[ 0.000000] log_buf_len individual max cpu contribution: 4096 bytes
[ 0.000000] log_buf_len total cpu_extra contributions: 12288 bytes
[ 0.000000] log_buf_len min size: 16384 bytes
[ 0.000000] log_buf_len: 32768 bytes
[ 0.000000] early log buf free: 14556(88%)
[ 0.000000] PID hash table entries: 4096 (order: 3, 32768 bytes)
[ 0.000000] Dentry cache hash table entries: 262144 (order: 9, 2097152 bytes)
[ 0.000000] Inode-cache hash table entries: 131072 (order: 8, 1048576 bytes)
[ 0.000000] Memory: 1380380K/2093056K available (12412K kernel code, 1404K rwdata, 5348K rodata, 1152K init, 378K bss, 57316K reserved, 655360K cma-reserved)
[ 0.000000] Virtual kernel memory layout:
[ 0.000000] modules : 0xffff000000000000 - 0xffff000008000000 ( 128 MB)
[ 0.000000] vmalloc : 0xffff000008000000 - 0xffff7dffbfff0000 (129022 GB)
[ 0.000000] .text : 0xffff000008080000 - 0xffff000008ca0000 ( 12416 KB)
[ 0.000000] .rodata : 0xffff000008ca0000 - 0xffff0000091e0000 ( 5376 KB)
[ 0.000000] .init : 0xffff0000091e0000 - 0xffff000009300000 ( 1152 KB)
[ 0.000000] .data : 0xffff000009300000 - 0xffff00000945f200 ( 1405 KB)
[ 0.000000] .bss : 0xffff00000945f200 - 0xffff0000094bdd6c ( 379 KB)
[ 0.000000] fixed : 0xffff7dfffe7fb000 - 0xffff7dfffec00000 ( 4116 KB)
[ 0.000000] PCI I/O : 0xffff7dfffee00000 - 0xffff7dffffe00000 ( 16 MB)
[ 0.000000] vmemmap : 0xffff7e0000000000 - 0xffff800000000000 ( 2048 GB maximum)
[ 0.000000] 0xffff7e0000000000 - 0xffff7e0002000000 ( 32 MB actual)
[ 0.000000] memory : 0xffff800000000000 - 0xffff800080000000 ( 2048 MB)
[ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
[ 0.000000] Preemptible hierarchical RCU implementation.
[ 0.000000] Build-time adjustment of leaf fanout to 64.
[ 0.000000] RCU restricting CPUs from NR_CPUS=64 to nr_cpu_ids=4.
[ 0.000000] RCU: Adjusting geometry for rcu_fanout_leaf=64, nr_cpu_ids=4
[ 0.000000] NR_IRQS:64 nr_irqs:64 0
[ 0.000000] GICv3: GIC: Using split EOI/Deactivate mode
[ 0.000000] ITS: No ITS available, not enabling LPIs
[ 0.000000] GICv3: CPU0: found redistributor 0 region 0:0x0000000038880000
[ 0.000000] i.MX8MM clock driver init done
[ 0.000000] arm_arch_timer: Architected cp15 timer(s) running at 8.00MHz (phys).
[ 0.000000] clocksource: arch_sys_counter: mask: 0xffffffffffffff max_cycles: 0x1d854df40, max_idle_ns: 440795202120 ns
[ 0.000003] sched_clock: 56 bits at 8MHz, resolution 125ns, wraps every 2199023255500ns
[ 0.000163] system counter timer init
[ 0.000206] sched_clock: 56 bits at 8MHz, resolution 125ns, wraps every 2199023255500ns
[ 0.000214] clocksource: imx sysctr: mask: 0xffffffffffffff max_cycles: 0x1d854df40, max_idle_ns: 440795202120 ns
[ 0.000565] Console: colour dummy device 80x25
[ 0.000585] Calibrating delay loop (skipped), value calculated u
[ 2.618927] mmcblk2: p1 p2
[ 2.624318] caam_jr 30901000.jr0: Instantiated RNG4 SH0.
[ 2.667098] mmc1: new ultra high speed SDR104 SDHC card at address aaaa
[ 2.674074] mmcblk1: mmc1:aaaa SB16G 14.8 GiB
[ 2.682620] mmcblk1: p1 p2
[ 2.691971] caam_jr 30901000.jr0: Instantiated RNG4 SH1.
[ 2.697375] Can't support > 32 bit dma.
[ 2.702229] Can't support > 32 bit dma.
[ 2.709578] caam algorithms registered in /proc/crypto
[ 2.717674] caam_jr 30901000.jr0: registering rng-caam
[ 2.722977] caam 30900000.caam: caam pkc algorithms registered in /proc/crypto
[ 2.731460] platform caam_sm: blkkey_ex: 2 keystore units available
[ 2.737847] platform caam_sm: 64-bit clear key:
[ 2.742391] platform caam_sm: [0000] 00 01 02 03 04 0f 06 07
[ 2.748059] platform caam_sm: 64-bit black key:
[ 2.752602] platform caam_sm: [0000] 9b b0 61 23 7b d1 43 00
[ 2.758269] platform caam_sm: [0008] c4 12 3a 74 d8 d9 df 2e
[ 2.763940] platform caam_sm: 128-bit clear key:
[ 2.768568] platform caam_sm: [0000] 00 01 02 03 04 0f 06 07
[ 2.774238] platform caam_sm: [0008] 08 09 0a 0b 0c 0d 0e 0f
[ 2.779902] platform caam_sm: 128-bit black key:
[ 2.784531] platform caam_sm: [0000] fe 48 7b 60 20 a5 37 84
[ 2.790200] platform caam_sm: [0008] 85 33 da 42 a5 6d dc 8e
[ 2.795870] platform caam_sm: 192-bit clear key:
[ 2.800495] platform caam_sm: [0000] 00 01 02 03 04 0f 06 07
[ 2.806164] platform caam_sm: [0008] 08 09 0a 0b 0c 0d 0e 0f
[ 2.811834] platform caam_sm: [0016] 10 11 12 13 14 15 16 17
[ 2.817519] platform caam_sm: 192-bit black key:
[ 2.822147] platform caam_sm: [0000] 8e 5f 5e dc bb 52 da 52
[ 2.827817] platform caam_sm: [0008] 12 c8 5f 89 ca 4e 8c 13
[ 2.833484] platform caam_sm: [0016] c2 cb 1b d8 88 88 76 98
[ 2.839153] platform caam_sm: [0024] ee 48 e3 60 54 15 c6 90
[ 2.844821] platform caam_sm: 256-bit clear key:
[ 2.849447] platform caam_sm: [0000] 00 01 02 03 04 0f 06 07
[ 2.855115] platform caam_sm: [0008] 08 09 0a 0b 0c 0d 0e 0f
[ 2.860784] platform caam_sm: [0016] 10 11 12 13 14 15 16 17
[ 2.866452] platform caam_sm: [0024] 18 19 1a 1b 1c 1d 1e 1f
[ 2.872118] platform caam_sm: 256-bit black key:
[ 2.876743] platform caam_sm: [0000] f4 e0 31 44 cd d1 5b 69
[ 2.882411] platform caam_sm: [0008] e2 ed fc c3 b5 a0 b6 50
[ 2.888081] platform caam_sm: [0016] 24 30 f9 5d 5e 37 a2 b9
[ 2.893748] platform caam_sm: [0024] e9 26 5f 35 b8 49 a8 5e
[ 2.899414] platform caam_sm: 64-bit unwritten blob:
[ 2.904392] platform caam_sm: [0000] 00 00 00 00 00 00 00 00
[ 2.910058] platform caam_sm: [0008] 00 00 00 00 00 00 00 00
[ 2.915727] platform caam_sm: [0016] 00 00 00 00 00 00 00 00
[ 2.921396] platform caam_sm: [0024] 00 00 00 00 00 00 00 00
[ 2.927063] platform caam_sm: [0032] 00 00 00 00 00 00 00 00

[ 2.927063] platform caam_sm: [0032] 00 00 00 00 00 00 00 00
[ 2.932731] platform caam_sm: [0040] 00 00 00 00 00 00 00 00
[ 2.938399] platform caam_sm: [0048] 00 00 00 00 00 00 00 00
[ 2.944067] platform caam_sm: [0056] 00 00 00 00 00 00 00 00
[ 2.949739] platform caam_sm: [0064] 00 00 00 00 00 00 00 00
[ 2.955408] platform caam_sm: [0072] 00 00 00 00 00 00 00 00
[ 2.961079] platform caam_sm: [0080] 00 00 00 00 00 00 00 00
[ 2.966745] platform caam_sm: [0088] 00 00 00 00 00 00 00 00
[ 2.972412] platform caam_sm: 128-bit unwritten blob:
[ 2.977471] platform caam_sm: [0000] 00 00 00 00 00 00 00 00
[ 2.983138] platform caam_sm: [0008] 00 00 00 00 00 00 00 00
[ 2.988806] platform caam_sm: [0016] 00 00 00 00 00 00 00 00
[ 2.994476] platform caam_sm: [0024] 00 00 00 00 00 00 00 00
[ 3.000142] platform caam_sm: [0032] 00 00 00 00 00 00 00 00
[ 3.005813] platform caam_sm: [0040] 00 00 00 00 00 00 00 00
[ 3.011483] platform caam_sm: [0048] 00 00 00 00 00 00 00 00
[ 3.017150] platform caam_sm: [0056] 00 00 00 00 00 00 00 00
[ 3.022820] platform caam_sm: [0064] 00 00 00 00 00 00 00 00
[ 3.028490] platform caam_sm: [0072] 00 00 00 00 00 00 00 00
[ 3.034156] platform caam_sm: [0080] 00 00 00 00 00 00 00 00
[ 3.039826] platform caam_sm: [0088] 00 00 00 00 00 00 00 00
[ 3.045494] platform caam_sm: 196-bit unwritten blob:
[ 3.050553] platform caam_sm: [0000] 00 00 00 00 00 00 00 00
[ 3.056221] platform caam_sm: [0008] 00 00 00 00 00 00 00 00
[ 3.061892] platform caam_sm: [0016] 00 00 00 00 00 00 00 00
[ 3.067559] platform caam_sm: [0024] 00 00 00 00 00 00 00 00
[ 3.073227] platform caam_sm: [0032] 00 00 00 00 00 00 00 00
[ 3.078898] platform caam_sm: [0040] 00 00 00 00 00 00 00 00
[ 3.084564] platform caam_sm: [0048] 00 00 00 00 00 00 00 00
[ 3.090233] platform caam_sm: [0056] 00 00 00 00 00 00 00 00
[ 3.095903] platform caam_sm: [0064] 00 00 00 00 00 00 00 00
[ 3.101570] platform caam_sm: [0072] 00 00 00 00 00 00 00 00
[ 3.107241] platform caam_sm: [0080] 00 00 00 00 00 00 00 00
[ 3.112907] platform caam_sm: [0088] 00 00 00 00 00 00 00 00
[ 3.118573] platform caam_sm: 256-bit unwritten blob:
[ 3.123634] platform caam_sm: [0000] 00 00 00 00 00 00 00 00
[ 3.129301] platform caam_sm: [0008] 00 00 00 00 00 00 00 00
[ 3.134970] platform caam_sm: [0016] 00 00 00 00 00 00 00 00
[ 3.140639] platform caam_sm: [0024] 00 00 00 00 00 00 00 00
[ 3.146308] platform caam_sm: [0032] 00 00 00 00 00 00 00 00
[ 3.151977] platform caam_sm: [0040] 00 00 00 00 00 00 00 00
[ 3.157645] platform caam_sm: [0048] 00 00 00 00 00 00 00 00
[ 3.163314] platform caam_sm: [0056] 00 00 00 00 00 00 00 00
[ 3.168985] platform caam_sm: [0064] 00 00 00 00 00 00 00 00
[ 3.174654] platform caam_sm: [0072] 00 00 00 00 00 00 00 00
[ 3.180322] platform caam_sm: [0080] 00 00 00 00 00 00 00 00
[ 3.185991] platform caam_sm: [0088] 00 00 00 00 00 00 00 00
[ 3.191760] platform caam_sm: 64-bit black key in blob:
[ 3.196998] platform caam_sm: [0000] 8c 86 ff c3 a4 b4 2c a6
[ 3.202671] platform caam_sm: [0008] b7 b6 5a 54 b4 b0 53 b5
[ 3.208341] platform caam_sm: [0016] 0b 6c 0c ee 91 2a 6c 25
[ 3.214011] platform caam_sm: [0024] 2c 5d ec 8d 7f 93 59 74
[ 3.219678] platform caam_sm: [0032] 79 ba 12 5e 82 8c ca a0
[ 3.225349] platform caam_sm: [0040] 3a 2e 3d ac d4 77 09 31
[ 3.231018] platform caam_sm: [0048] 90 fd 3a 78 6f f9 97 30
[ 3.236687] platform caam_sm: [0056] 00 00 00 00 00 00 00 00
[ 3.242356] platform caam_sm: [0064] 00 00 00 00 00 00 00 00
[ 3.248025] platform caam_sm: [0072] 00 00 00 00 00 00 00 00
[ 3.253692] platform caam_sm: [0080] 00 00 00 00 00 00 00 00
[ 3.259361] platform caam_sm: [0088] 00 00 00 00 00 00 00 00
[ 3.265025] platform caam_sm: 128-bit black key in blob:
[ 3.270349] platform caam_sm: [0000] f2 32 94 42 63 52 4f c9
[ 3.276018] platform caam_sm: [0008] f5 fb f4 64 f4 4a 60 4d
[ 3.281687] platform caam_sm: [0016] a1 28 d5 c2 2d 80 f8 9b
[ 3.287356] platform caam_sm: [0024] 1f f6 3f 57 71 1d c0 86
[ 3.293025] platform caam_sm: [0032] 08 1a 01 b0 2f ad 89 b0
[ 3.298694] platform caam_sm: [0040] 4f 12 9e ac 2c b6 31 df
[ 3.304362] platform caam_sm: [0048] cc bf b7 b0 47 dd c5 fe
[ 3.310031] platform caam_sm: [0056] ad ee ec 7b ab 13 40 91
[ 3.315700] platform caam_sm: [0064] 00 00 00 00 00 00 00 00
[ 3.321367] platform caam_sm: [0072] 00 00 00 00 00 00 00 00
[ 3.327037] platform caam_sm: [0080] 00 00 00 00 00 00 00 00
[ 3.332706] platform caam_sm: [0088] 00 00 00 00 00 00 00 00
[ 3.338373] platform caam_sm: 192-bit black key in blob:
[ 3.343696] platform caam_sm: [0000] 10 f4 d8 cf 1f 09 e8 3e
[ 3.349365] platform caam_sm: [0008] 25 70 32 ac a9 f2 a9 7f
[ 3.355034] platform caam_sm: [0016] a8 c0 bd 48 85 cb f7 4b
[ 3.360702] platform caam_sm: [0024] a1 cb a5 d3 14 a4 f1 66
[ 3.366372] platform caam_sm: [0032] bf 4b 3b 90 75 89 d5 4c
[ 3.372040] platform caam_sm: [0040] aa b3 3e 7d ce 3c 4b 47
[ 3.377709] platform caam_sm: [0048] 48 26 ac 2f 74 56 e3 8c
[ 3.383378] platform caam_sm: [0056] 51 73 ca 44 af 5e 65 43
[ 3.389048] platform caam_sm: [0064] 96 3c 37 d1 54 f5 3f 0f
[ 3.394717] platform caam_sm: [0072] 00 00 00 00 00 00 00 00
[ 3.400386] platform caam_sm: [0080] 00 00 00 00 00 00 00 00
[ 3.406055] platform caam_sm: [0088] 00 00 00 00 00 00 00 00
[ 3.411719] platform caam_sm: 256-bit black key in blob:
[ 3.417044] platform caam_sm: [0000] f7 01 6e 5a 5f 32 78 dd
[ 3.422713] platform caam_sm: [0008] fc b2 68 e8 7f 2a 7f 77
[ 3.428382] platform caam_sm: [0016] 96 9e 68 6c 46 03 ea 2b
[ 3.434051] platform caam_sm: [0024] 80 72 01 af 71 5e b6 c4
[ 3.439719] platform caam_sm: [0032] 11 41 09 30 24 53 d3 92
[ 3.445388] platform caam_sm: [0040] a3 fc 56 10 a9 db 95 01
[ 3.451057] platform caam_sm: [0048] 22 cd e1 0e e6 74 93 4a
3.451057] platform caam_sm: [0048] 22 cd e1 0e e6 74 93 4a
[ 3.456726] platform caam_sm: [0056] a0 5f 71 78 bc d7 eb c4
[ 3.462400] platform caam_sm: [0064] e3 02 ad b4 ae a0 a0 19
[ 3.468069] platform caam_sm: [0072] 34 d1 20 fe b8 d0 fb 73
[ 3.473738] platform caam_sm: [0080] 00 00 00 00 00 00 00 00
[ 3.479408] platform caam_sm: [0088] 00 00 00 00 00 00 00 00
[ 3.485515] platform caam_sm: restored 64-bit black key:
[ 3.490841] platform caam_sm: [0000] 20 c5 71 38 23 c1 26 49
[ 3.496510] platform caam_sm: [0008] c7 2d d6 ab b7 22 2c 7d
[ 3.502178] platform caam_sm: restored 128-bit black key:
[ 3.507587] platform caam_sm: [0000] fe 48 7b 60 20 a5 37 84
[ 3.513256] platform caam_sm: [0008] 85 33 da 42 a5 6d dc 8e
[ 3.518923] platform caam_sm: restored 192-bit black key:
[ 3.524329] platform caam_sm: [0000] 8e 5f 5e dc bb 52 da 52
[ 3.529999] platform caam_sm: [0008] 12 c8 5f 89 ca 4e 8c 13
[ 3.535667] platform caam_sm: [0016] d1 45 7a 9d ed 96 72 4d
[ 3.541336] platform caam_sm: [0024] 3d 6f fd 9d ce de 62 9c
[ 3.547002] platform caam_sm: restored 256-bit black key:
[ 3.552411] platform caam_sm: [0000] f4 e0 31 44 cd d1 5b 69
[ 3.558079] platform caam_sm: [0008] e2 ed fc c3 b5 a0 b6 50
[ 3.563745] platform caam_sm: [0016] 24 30 f9 5d 5e 37 a2 b9
[ 3.569415] platform caam_sm: [0024] e9 26 5f 35 b8 49 a8 5e
[ 3.575438] caam-snvs 30370000.caam-snvs: can't get snvs clock
[ 3.581315] caam-snvs 30370000.caam-snvs: violation handlers armed - non-secure state
[ 3.589768] usbcore: registered new interface driver usbhid
[ 3.595359] usbhid: USB HID core driver
[ 3.613711] ak4458 2-0010: Failed to get supply 'DVDD': -517
[ 3.619401] ak4458 2-0010: Failed to request supplies: -517
[ 3.625151] ak4458 2-0012: Failed to get supply 'DVDD': -517
[ 3.630840] ak4458 2-0012: Failed to request supplies: -517
[ 3.636604] ak4497 2-0011: Failed to get supply 'DVDD': -517
[ 3.642275] ak4497 2-0011: Failed to request supplies: -517
[ 3.649048] ak5558 2-0013: Failed to get supply 'DVDD': -517
[ 3.654728] ak5558 2-0013: Failed to request supplies: -517
3.678899] imx-wm8524 sound-wm8524: wm8524-hifi <-> 30030000.sai mapping ok
[ 3.685993] wm8524-codec wm8524: Supported sample rate: 192000Hz
[ 3.692015] wm8524-codec wm8524: Supported sample rate: 96000Hz
[ 3.697942] wm8524-codec wm8524: Supported sample rate: 48000Hz
[ 3.703877] wm8524-codec wm8524: Supported sample rate: 32000Hz
[ 3.711841] imx-spdif sound-spdif: snd-soc-dummy-dai <-> 30090000.spdif mapping ok
[ 3.720594] imx-micfil sound-micfil: snd-soc-dummy-dai <-> 30080000.micfil mapping ok
[ 3.735347] imx-ak4458 sound-ak4458: ASoC: CODEC DAI ak4458-aif not registered
[ 3.742618] imx-ak4458 sound-ak4458: snd_soc_register_card failed (-517)
[ 3.750094] NET: Registered protocol family 26
[ 3.754642] NET: Registered protocol family 17
[ 3.759108] can: controller area network core (rev 20120528 abi 9)
[ 3.765344] NET: Registered protocol family 29
[ 3.769799] can: raw protocol (rev 20120528)
[ 3.774078] can: broadcast manager protocol (rev 20161123 t)
[ 3.779749] can: netlink gateway (rev 20130117) max_hops=1
[ 3.785433] Bluetooth: RFCOMM TTY layer initialized
[ 3.790327] Bluetooth: RFCOMM socket layer initialized
[ 3.795485] Bluetooth: RFCOMM ver 1.11
[ 3.799246] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 3.804568] Bluetooth: BNEP filters: protocol multicast
[ 3.809804] Bluetooth: BNEP socket layer initialized
[ 3.814779] Bluetooth: HIDP (Human Interface Emulation) ver 1.2
[ 3.820708] Bluetooth: HIDP socket layer initialized
[ 3.825719] lib80211: common routines for IEEE802.11 drivers
[ 3.831420] 9pnet: Installing 9P2000 support
[ 3.835749] Key type dns_resolver registered
[ 3.840533] registered taskstats version 1
[ 3.856968] cpufreq: cpufreq_online: CPU0: Running at unlisted freq: 500000 KHz
[ 3.865968] cpufreq: cpufreq_online: CPU0: Unlisted initial frequency changed to: 1200000 KHz

igorpadykov · ‎09-20-2020

Hi vaa

what board used in the case : EVK or custom board. If EVK one can

flash new sd card with Demo Image found on below link:

https://www.nxp.com/design/software/embedded-software/i-mx-software/embedded-linux-for-i-mx-applicat...

Best regards
igor