[SOLVED] IMX6UL Duplicate OPP Detected

[danielberhe]

Hi All,

I'm getting a number of 'duplicate OPPs detected' warning messages during Linux boot. I am working on a custom IMX6UL board and started seeing this issue after upgrading from mainline kernel 4.14 to 4.19 from https://github.com/Freescale/linux-fslc. I tried the new kernel on another custom board based on IMX6 Solo and don't see the issue on it. I did a bit of digging and it seems like the function imx6q_cpufreq_probe in imx6q-cpufreq.c is being called multiple times on the IMX6UL based board but I can't figure out why this is.

Below is the boot log - the sections I'm referring to are in bold:

Starting kernel ...

Booting Linux on physical CPU 0x0
Linux version 4.19.107 (gcc version 9.2.0 (Buildroot 2019.11)) #13 PREEMPT Wed Apr 15 09:56:37 BST 2020
CPU: ARMv7 Processor [410fc075] revision 5 (ARMv7), cr=10c53c7d
CPU: div instructions available: patching division code
CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
OF: fdt: Machine model:
bootconsole [earlycon0] enabled
Memory policy: Data cache writeback
cma: Failed to reserve 320 MiB
CPU: All CPU(s) started in SVC mode.
random: get_random_bytes called from start_kernel+0x7c/0x3e8 with crng_init=0
Built 1 zonelists, mobility grouping on. Total pages: 65024
Kernel command line: noinitrd console=ttymxc0,115200 earlyprintk boot_method=tftp boot_ve
Dentry cache hash table entries: 32768 (order: 5, 131072 bytes)
Inode-cache hash table entries: 16384 (order: 4, 65536 bytes)
Memory: 247716K/262144K available (4096K kernel code, 112K rwdata, 796K rodata, 1024K init, 120K bss, 14428K reserved, 0K cma-reserved)
Virtual kernel memory layout:
vector : 0xffff0000 - 0xffff1000 ( 4 kB)
fixmap : 0xffc00000 - 0xfff00000 (3072 kB)
vmalloc : 0xd0800000 - 0xff800000 ( 752 MB)
lowmem : 0xc0000000 - 0xd0000000 ( 256 MB)
modules : 0xbf000000 - 0xc0000000 ( 16 MB)
.text : 0x(ptrval) - 0x(ptrval) (5088 kB)
.init : 0x(ptrval) - 0x(ptrval) (1024 kB)
.data : 0x(ptrval) - 0x(ptrval) ( 113 kB)
.bss : 0x(ptrval) - 0x(ptrval) ( 121 kB)
rcu: Preemptible hierarchical RCU implementation.
Tasks RCU enabled.
NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16
Switching to timer-based delay loop, resolution 41ns
sched_clock: 32 bits at 24MHz, resolution 41ns, wraps every 89478484971ns
clocksource: mxc_timer1: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 79635851949 ns
Calibrating delay loop (skipped), value calculated using timer frequency.. 48.00 BogoMIPS (lpj=24000)
pid_max: default: 32768 minimum: 301
Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
CPU: Testing write buffer coherency: ok
Setting up static identity map for 0x80100000 - 0x80100060
rcu: Hierarchical SRCU implementation.
devtmpfs: initialized
VFP support v0.3: implementor 41 architecture 2 part 30 variant 7 rev 5
clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 1911260446275000 ns
futex hash table entries: 256 (order: -1, 3072 bytes)
pinctrl core: initialized pinctrl subsystem
NET: Registered protocol family 16
DMA: preallocated 256 KiB pool for atomic coherent allocations
vdd3p0: supplied by regulator-dummy
cpu: supplied by regulator-dummy
vddsoc: supplied by regulator-dummy
imx6ul-pinctrl 20e0000.iomuxc: initialized IMX pinctrl driver
mxs-dma 1804000.dma-apbh: initialized
imx-i2c 21a0000.i2c: can't get pinctrl, bus recovery not supported
i2c i2c-0: IMX I2C adapter registered
i2c i2c-0: can't use DMA, using PIO instead.
clocksource: Switched to clocksource mxc_timer1
random: fast init done
NET: Registered protocol family 2
tcp_listen_portaddr_hash hash table entries: 512 (order: 0, 4096 bytes)
TCP established hash table entries: 2048 (order: 1, 8192 bytes)
TCP bind hash table entries: 2048 (order: 1, 8192 bytes)
TCP: Hash tables configured (established 2048 bind 2048)
UDP hash table entries: 256 (order: 0, 4096 bytes)
UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
NET: Registered protocol family 1
Unpacking initramfs...
Freeing initrd memory: 5644K
workingset: timestamp_bits=30 max_order=16 bucket_order=0
io scheduler noop registered
io scheduler cfq registered (default)
imx-sdma 20ec000.sdma: failed to get firmware from device tree
console [ttymxc0] enabled
bootconsole [earlycon0] disabled
21e8000.serial: ttymxc1 at MMIO 0x21e8000 (irq = 51, base_baud = 5000000) is a IMX
fsl-quadspi 21e0000.qspi: n25q256a (32768 Kbytes)
5 fixed-partitions partitions found on MTD device 21e0000.qspi
Creating 5 MTD partitions on "21e0000.qspi":
0x000000000000-0x000000001000 : "QSPI Config Parameters"
0x000000001000-0x000000100000 : "U-boot"
0x000000100000-0x000000102000 : "U-boot Env"
0x000000108000-0x000000109000 : "Manu Settings"
0x000000200000-0x000001a00000 : "Linux"
spi_imx 2008000.ecspi: dma setup error -19, use pio
------------[ cut here ]------------
WARNING: CPU: 0 PID: 1 at drivers/spi/spidev.c:730 spidev_probe+0x38/0x164
/soc/aips-bus@2000000/spba-bus@2000000/ecspi@2008000/spi@0: buggy DT: spidev listed directly in DT
Modules linked in:
CPU: 0 PID: 1 Comm: swapper Not tainted 4.19.107 #13
Hardware name: Freescale i.MX6 Ultralite (Device Tree)
[<c010c820>] (unwind_backtrace) from [<c010a4b0>] (show_stack+0x10/0x14)
[<c010a4b0>] (show_stack) from [<c0116834>] (__warn+0xd4/0xec)
[<c0116834>] (__warn) from [<c011649c>] (warn_slowpath_fmt+0x44/0x70)
[<c011649c>] (warn_slowpath_fmt) from [<c031ee3c>] (spidev_probe+0x38/0x164)
[<c031ee3c>] (spidev_probe) from [<c031b22c>] (spi_drv_probe+0x88/0xa4)
[<c031b22c>] (spi_drv_probe) from [<c02ec928>] (really_probe+0x1d8/0x2a0)
[<c02ec928>] (really_probe) from [<c02ecc88>] (driver_probe_device+0x140/0x158)
[<c02ecc88>] (driver_probe_device) from [<c02eaf64>] (bus_for_each_drv+0xa0/0xb8)
[<c02eaf64>] (bus_for_each_drv) from [<c02ecaac>] (__device_attach+0xbc/0x134)
[<c02ecaac>] (__device_attach) from [<c02ebd00>] (bus_probe_device+0x28/0x80)
[<c02ebd00>] (bus_probe_device) from [<c02ea008>] (device_add+0x46c/0x564)
[<c02ea008>] (device_add) from [<c031be48>] (spi_add_device+0xe4/0x124)
[<c031be48>] (spi_add_device) from [<c031c948>] (spi_register_controller+0x7c8/0x8a0)
[<c031c948>] (spi_register_controller) from [<c0320064>] (spi_bitbang_start+0xe4/0x120)
[<c0320064>] (spi_bitbang_start) from [<c03215c0>] (spi_imx_probe+0x570/0x62c)
[<c03215c0>] (spi_imx_probe) from [<c02ee28c>] (platform_drv_probe+0x48/0x94)
[<c02ee28c>] (platform_drv_probe) from [<c02ec928>] (really_probe+0x1d8/0x2a0)
[<c02ec928>] (really_probe) from [<c02ecc88>] (driver_probe_device+0x140/0x158)
[<c02ecc88>] (driver_probe_device) from [<c02ecd3c>] (__driver_attach+0x9c/0xd8)
[<c02ecd3c>] (__driver_attach) from [<c02eae70>] (bus_for_each_dev+0x64/0xa4)
[<c02eae70>] (bus_for_each_dev) from [<c02ebf9c>] (bus_add_driver+0x168/0x1cc)
[<c02ebf9c>] (bus_add_driver) from [<c02ed478>] (driver_register+0xac/0xf0)
[<c02ed478>] (driver_register) from [<c0102604>] (do_one_initcall+0x74/0x17c)
[<c0102604>] (do_one_initcall) from [<c0600e28>] (kernel_init_freeable+0x17c/0x1bc)
[<c0600e28>] (kernel_init_freeable) from [<c0435bb0>] (kernel_init+0x8/0x10c)
[<c0435bb0>] (kernel_init) from [<c01010e8>] (ret_from_fork+0x14/0x2c)
Exception stack(0xcf83dfb0 to 0xcf83dff8)
dfa0: 00000000 00000000 00000000 00000000
dfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
dfe0: 00000000 00000000 00000000 00000000 00000013 00000000
---[ end trace b774167321f11a96 ]---
spi_imx 2008000.ecspi: probed
libphy: Fixed MDIO Bus: probed
fec 2188000.ethernet: 2188000.ethernet supply phy not found, using dummy regulator
fec 2188000.ethernet: Linked as a consumer to regulator.0
libphy: fec_enet_mii_bus: probed
input: gpio-decoder0 as /devices/soc0/gpio-decoder0/input/input0
snvs_rtc 20cc000.snvs:snvs-rtc-lp: registered as rtc0
i2c /dev entries driver
imx2-wdt 20bc000.wdog: timeout 60 sec (nowayout=1)
sdhci: Secure Digital Host Controller Interface driver
sdhci: Copyright(c) Pierre Ossman
sdhci-pltfm: SDHCI platform and OF driver helper
sdhci-esdhc-imx 2190000.usdhc: Linked as a consumer to regulator.4
mmc0: SDHCI controller on 2190000.usdhc [2190000.usdhc] using ADMA
NET: Registered protocol family 17
8021q: 802.1Q VLAN Support v1.8
cpu cpu0: Linked as a consumer to regulator.2
cpu cpu0: Linked as a consumer to regulator.3
cpu cpu0: _opp_is_duplicate: duplicate OPPs detected. Existing: freq: 696000000, volt: 1275000, enabled: 1. New: freq: 696000000, volt: 1275000, enabled: 1
cpu cpu0: _opp_is_duplicate: duplicate OPPs detected. Existing: freq: 528000000, volt: 1175000, enabled: 1. New: freq: 528000000, volt: 1175000, enabled: 1
cpu cpu0: _opp_is_duplicate: duplicate OPPs detected. Existing: freq: 396000000, volt: 1025000, enabled: 1. New: freq: 396000000, volt: 1025000, enabled: 1
cpu cpu0: _opp_is_duplicate: duplicate OPPs detected. Existing: freq: 198000000, volt: 950000, enabled: 1. New: freq: 198000000, volt: 950000, enabled: 1
mmc0: unrecognised SCR structure version 6
mmc0: error -22 whilst initialising SD card
cpu cpu0: _opp_is_duplicate: duplicate OPPs detected. Existing: freq: 696000000, volt: 1275000, enabled: 1. New: freq: 696000000, volt: 1275000, enabled: 1
cpu cpu0: _opp_is_duplicate: duplicate OPPs detected. Existing: freq: 528000000, volt: 1175000, enabled: 1. New: freq: 528000000, volt: 1175000, enabled: 1
cpu cpu0: _opp_is_duplicate: duplicate OPPs detected. Existing: freq: 396000000, volt: 1025000, enabled: 1. New: freq: 396000000, volt: 1025000, enabled: 1
cpu cpu0: _opp_is_duplicate: duplicate OPPs detected. Existing: freq: 198000000, volt: 950000, enabled: 1. New: freq: 198000000, volt: 950000, enabled: 1
snvs_rtc 20cc000.snvs:snvs-rtc-lp: setting system clock to 1970-03-24 21:50:49 UTC (7163449)
Freeing unused kernel memory: 1024K
Run /init as init process
mmc0: host does not support reading read-only switch, assuming write-enable
mmc0: new high speed SDHC card at address 59b4
mmcblk0: mmc0:59b4 USD 3.76 GiB
mmcblk0:
mount: mounting devpts on /dev/pts failed: No such device
cpu cpu0: _opp_is_duplicate: duplicate OPPs detected. Existing: freq: 696000000, volt: 1275000, enabled: 1. New: freq: 696000000, volt: 1275000, enabled: 1
cpu cpu0: _opp_is_duplicate: duplicate OPPs detected. Existing: freq: 528000000, volt: 1175000, enabled: 1. New: freq: 528000000, volt: 1175000, enabled: 1
cpu cpu0: _opp_is_duplicate: duplicate OPPs detected. Existing: freq: 396000000, volt: 1025000, enabled: 1. New: freq: 396000000, volt: 1025000, enabled: 1
cpu cpu0: _opp_is_duplicate: duplicate OPPs detected. Existing: freq: 198000000, volt: 950000, enabled: 1. New: freq: 198000000, volt: 950000, enabled: 1
Starting syslogd: OK
Starting klogd: OK
Running sysctl: OK
Saving random seed: random: dd: uninitialized urandom read (512 bytes read)
OK
Starting network: OK
Initialising GPIOs
/

Welcome to Buildroot

Any ideas would great.

Daniel

[danielberhe · Accepted solution]

Enabling CONFIG_NVMEM_IMX_OCOTP in the kernel fixed the issue.

Daniel

[danielberhe]

Hi Igor,

Thank you for your response.

I tried it with NXP official kernel L4.19.35.1.1.0 and I'm still seeing the same issue.

Starting kernel ...

Booting Linux on physical CPU 0x0
Linux version 4.19.35 (gcc version 9.2.0 (Buildroot 2019.11)) #1 PREEMPT Wed Apr 15 12:01:50 BST 2020
CPU: ARMv7 Processor [410fc075] revision 5 (ARMv7), cr=10c53c7d
CPU: div instructions available: patching division code
CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
OF: fdt: Machine model:
bootconsole [earlycon0] enabled
Memory policy: Data cache writeback
cma: Failed to reserve 320 MiB
CPU: All CPU(s) started in SVC mode.
random: get_random_bytes called from start_kernel+0x7c/0x3ec with crng_init=0
Built 1 zonelists, mobility grouping on. Total pages: 65024
Kernel command line: noinitrd console=ttymxc0,115200 earlyprintk boot_method=tftp boot_ve
Dentry cache hash table entries: 32768 (order: 5, 131072 bytes)
Inode-cache hash table entries: 16384 (order: 4, 65536 bytes)
Memory: 248452K/262144K available (4096K kernel code, 314K rwdata, 688K rodata, 1024K init, 122K bss, 13692K reserved, 0K cma-reserved)
Virtual kernel memory layout:
vector : 0xffff0000 - 0xffff1000 ( 4 kB)
fixmap : 0xffc00000 - 0xfff00000 (3072 kB)
vmalloc : 0xd0800000 - 0xff800000 ( 752 MB)
lowmem : 0xc0000000 - 0xd0000000 ( 256 MB)
.text : 0x(ptrval) - 0x(ptrval) (5088 kB)
.init : 0x(ptrval) - 0x(ptrval) (1024 kB)
.data : 0x(ptrval) - 0x(ptrval) ( 315 kB)
.bss : 0x(ptrval) - 0x(ptrval) ( 123 kB)
rcu: Preemptible hierarchical RCU implementation.
Tasks RCU enabled.
NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16
Switching to timer-based delay loop, resolution 333ns
sched_clock: 32 bits at 3000kHz, resolution 333ns, wraps every 715827882841ns
clocksource: mxc_timer1: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 637086815595 ns
Calibrating delay loop (skipped), value calculated using timer frequency.. 6.00 BogoMIPS (lpj=3000)
pid_max: default: 32768 minimum: 301
Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
CPU: Testing write buffer coherency: ok
Setting up static identity map for 0x80100000 - 0x80100060
rcu: Hierarchical SRCU implementation.
devtmpfs: initialized
VFP support v0.3: implementor 41 architecture 2 part 30 variant 7 rev 5
clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 1911260446275000 ns
futex hash table entries: 256 (order: -1, 3072 bytes)
pinctrl core: initialized pinctrl subsystem
NET: Registered protocol family 16
DMA: preallocated 256 KiB pool for atomic coherent allocations
vdd3p0: supplied by regulator-dummy
cpu: supplied by regulator-dummy
vddsoc: supplied by regulator-dummy
imx6ul-pinctrl 20e0000.iomuxc: initialized IMX pinctrl driver
random: fast init done
imx-i2c 21a0000.i2c: can't get pinctrl, bus recovery not supported
i2c i2c-0: IMX I2C adapter registered
i2c i2c-0: can't use DMA, using PIO instead.
clocksource: Switched to clocksource mxc_timer1
NET: Registered protocol family 2
tcp_listen_portaddr_hash hash table entries: 512 (order: 0, 4096 bytes)
TCP established hash table entries: 2048 (order: 1, 8192 bytes)
TCP bind hash table entries: 2048 (order: 1, 8192 bytes)
TCP: Hash tables configured (established 2048 bind 2048)
UDP hash table entries: 256 (order: 0, 4096 bytes)
UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
NET: Registered protocol family 1
Unpacking initramfs...
Freeing initrd memory: 4688K
Bus freq driver module loaded
workingset: timestamp_bits=30 max_order=16 bucket_order=0
io scheduler noop registered
io scheduler cfq registered (default)
imx-sdma 20ec000.sdma: failed to get firmware from device tree
mxs-dma 1804000.dma-apbh: initialized
console [ttymxc0] enabled
bootconsole [earlycon0] disabled
21e8000.serial: ttymxc1 at MMIO 0x21e8000 (irq = 53, base_baud = 5000000) is a IMX
fsl-quadspi 21e0000.qspi: n25q256a (32768 Kbytes)
5 fixed-partitions partitions found on MTD device 21e0000.qspi
Creating 5 MTD partitions on "21e0000.qspi":
0x000000000000-0x000000001000 : "QSPI Config Parameters"
0x000000001000-0x000000100000 : "U-boot"
0x000000100000-0x000000102000 : "U-boot Env"
0x000000108000-0x000000109000 : "Manu Settings"
0x000000200000-0x000001a00000 : "Linux"
spidev spi0.0: buggy DT: spidev listed directly in DT
------------[ cut here ]------------
WARNING: CPU: 0 PID: 1 at drivers/spi/spidev.c:729 spidev_probe+0x60/0x18c
CPU: 0 PID: 1 Comm: swapper Not tainted 4.19.35 #1
Hardware name: Freescale i.MX6 UltraLite (Device Tree)
[<c010ba60>] (unwind_backtrace) from [<c010a274>] (show_stack+0x10/0x14)
[<c010a274>] (show_stack) from [<c0119474>] (__warn+0xd0/0xe8)
[<c0119474>] (__warn) from [<c01194c4>] (warn_slowpath_null+0x38/0x44)
[<c01194c4>] (warn_slowpath_null) from [<c031d5f0>] (spidev_probe+0x60/0x18c)
[<c031d5f0>] (spidev_probe) from [<c0319920>] (spi_drv_probe+0x88/0xa4)
[<c0319920>] (spi_drv_probe) from [<c02eb108>] (really_probe+0x1d8/0x2a0)
[<c02eb108>] (really_probe) from [<c02eb564>] (driver_probe_device+0x140/0x15c)
[<c02eb564>] (driver_probe_device) from [<c02e9d28>] (bus_for_each_drv+0xa0/0xb8)
[<c02e9d28>] (bus_for_each_drv) from [<c02eb2d4>] (__device_attach+0xbc/0x134)
[<c02eb2d4>] (__device_attach) from [<c02e9e34>] (bus_probe_device+0x28/0x80)
[<c02e9e34>] (bus_probe_device) from [<c02e8688>] (device_add+0x46c/0x564)
[<c02e8688>] (device_add) from [<c031baa0>] (spi_add_device+0xe4/0x124)
[<c031baa0>] (spi_add_device) from [<c031c4e8>] (spi_register_controller+0x7c8/0x8a0)
[<c031c4e8>] (spi_register_controller) from [<c031e814>] (spi_bitbang_start+0xe0/0x120)
[<c031e814>] (spi_bitbang_start) from [<c03202a4>] (spi_imx_probe+0x4f0/0x624)
[<c03202a4>] (spi_imx_probe) from [<c02ec660>] (platform_drv_probe+0x48/0x94)
[<c02ec660>] (platform_drv_probe) from [<c02eb108>] (really_probe+0x1d8/0x2a0)
[<c02eb108>] (really_probe) from [<c02eb564>] (driver_probe_device+0x140/0x15c)
[<c02eb564>] (driver_probe_device) from [<c02eb60c>] (__driver_attach+0x8c/0xc8)
[<c02eb60c>] (__driver_attach) from [<c02e98c0>] (bus_for_each_dev+0x64/0xa4)
[<c02e98c0>] (bus_for_each_dev) from [<c02ea0c4>] (bus_add_driver+0x15c/0x1c0)
[<c02ea0c4>] (bus_add_driver) from [<c02ebdac>] (driver_register+0xac/0xf0)
[<c02ebdac>] (driver_register) from [<c0600de0>] (do_one_initcall+0x74/0x17c)
[<c0600de0>] (do_one_initcall) from [<c0601064>] (kernel_init_freeable+0x17c/0x1bc)
[<c0601064>] (kernel_init_freeable) from [<c046a16c>] (kernel_init+0x8/0x10c)
[<c046a16c>] (kernel_init) from [<c01010e8>] (ret_from_fork+0x14/0x2c)
Exception stack(0xcc03dfb0 to 0xcc03dff8)
dfa0: 00000000 00000000 00000000 00000000
dfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
dfe0: 00000000 00000000 00000000 00000000 00000013 00000000
---[ end trace f1eb9331888ec13a ]---
spi_imx 2008000.ecspi: probed
libphy: Fixed MDIO Bus: probed
fec 2188000.ethernet: 2188000.ethernet supply phy not found, using dummy regulator
fec 2188000.ethernet: Linked as a consumer to regulator.0
libphy: fec_enet_mii_bus: probed
input: gpio-decoder0 as /devices/soc0/gpio-decoder0/input/input0
snvs_rtc 20cc000.snvs:snvs-rtc-lp: rtc core: registered 20cc000.snvs:snvs-rtc-lp as rtc0
i2c /dev entries driver
imx2-wdt 20bc000.wdog: timeout 60 sec (nowayout=1)
sdhci: Secure Digital Host Controller Interface driver
sdhci: Copyright(c) Pierre Ossman
sdhci-pltfm: SDHCI platform and OF driver helper
sdhci-esdhc-imx 2190000.usdhc: Linked as a consumer to regulator.4
mmc0: SDHCI controller on 2190000.usdhc [2190000.usdhc] using ADMA
NET: Registered protocol family 17
8021q: 802.1Q VLAN Support v1.8
cpu cpu0: Linked as a consumer to regulator.2
cpu cpu0: Linked as a consumer to regulator.3
cpu cpu0: _opp_is_duplicate: duplicate OPPs detected. Existing: freq: 696000000, volt: 1275000, enabled: 1. New: freq: 696000000, volt: 1275000, enabled: 1
cpu cpu0: _opp_is_duplicate: duplicate OPPs detected. Existing: freq: 528000000, volt: 1175000, enabled: 1. New: freq: 528000000, volt: 1175000, enabled: 1
cpu cpu0: _opp_is_duplicate: duplicate OPPs detected. Existing: freq: 396000000, volt: 1025000, enabled: 1. New: freq: 396000000, volt: 1025000, enabled: 1
cpu cpu0: _opp_is_duplicate: duplicate OPPs detected. Existing: freq: 198000000, volt: 950000, enabled: 1. New: freq: 198000000, volt: 950000, enabled: 1
cpu cpu0: _opp_is_duplicate: duplicate OPPs detected. Existing: freq: 696000000, volt: 1275000, enabled: 1. New: freq: 696000000, volt: 1275000, enabled: 1
cpu cpu0: _opp_is_duplicate: duplicate OPPs detected. Existing: freq: 528000000, volt: 1175000, enabled: 1. New: freq: 528000000, volt: 1175000, enabled: 1
cpu cpu0: _opp_is_duplicate: duplicate OPPs detected. Existing: freq: 396000000, volt: 1025000, enabled: 1. New: freq: 396000000, volt: 1025000, enabled: 1
cpu cpu0: _opp_is_duplicate: duplicate OPPs detected. Existing: freq: 198000000, volt: 950000, enabled: 1. New: freq: 198000000, volt: 950000, enabled: 1
snvs_rtc 20cc000.snvs:snvs-rtc-lp: setting system clock to 1970-03-24 23:58:20 UTC (7171100)
Freeing unused kernel memory: 1024K

Regards,

Daniel

[igorpadykov]

Hi Daniel

could you try to reproduce issue on i.MX6UL EVK reference board

with Demo Image

Linux Binary Demo Files - i.MX 6UltraLite, i.MX 6ULL, i.MX 7Dual

Best regards
igor
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
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[danielberhe]

Unfortunately, I don't have an i.MX6UL EVK with me.

Daniel

[igorpadykov]

Hi Daniel

one can test with nxp offiical kernels from source.codeaurora.org/external/imx/linux-imx  repository
linux-imx - i.MX Linux kernel 
Linux  documentation

i.MX Software and Development Tools | NXP 

Difference between it and mainline and fslc kernels is described on

difference between Yocto Community BSP and Freescale BSP Release 

Since nxp does not support other kernels, issue may be posted on

meta-fsl-arm mailing list

meta-freescale@lists.yoctoproject.org | Home 

Best regards
igor
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------