RE: [REGRESSION] mainline/master: Apalis iMX6 no longer boots

> -----Original Message-----
> From: Frank Li <[email protected]>
> Sent: Tuesday, June 30, 2026 4:19 AM
> To: Leonardo Costa <[email protected]>
> Cc: [email protected]; [email protected]; [email protected]; Frank Li
> <[email protected]>; [email protected]; [email protected];
> [email protected]; [email protected];
> [email protected]; [email protected]; linux-arm-
> [email protected]; [email protected];
> [email protected]
> Subject: Re: [REGRESSION] mainline/master: Apalis iMX6 no longer boots
> 
> On Mon, Jun 29, 2026 at 11:34:32AM -0300, Leonardo Costa wrote:
> > Hello,
> >
> > We are seeing a regression on Apalis iMX6 where the kernel doesn't
> > boot in the newest v7.2-rc1 (it was working before, in v7.1). The
> > device tree being used is the imx6q-apalis-eval.dtb. The kernel configuration
> used is the one shown below:
> >
> >
> > https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgist
> > .github.com%2Flcosta37%2F53efdb2fb6e6e0fc05437c7e53b47737&data=
> 05%7C02
> > %7Chongxing.zhu%40nxp.com%7Ca4fdd946d8064da8b63d08ded61bab4
> 2%7C686ea1d
> >
> 3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C639183611522951306%7CU
> nknown%7CTWF
> >
> pbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW
> 4zMiIsI
> >
> kFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=yVygffYEhpLZ
> f5tpwu4
> > yVZn5sL%2BdQySGZwryUh3i0zU%3D&reserved=0
> >
> > The kernel logs stop almost immediately as the board starts to boot,
> > and I don't notice any difference in the logs that points to the cause.
> >
> > Is this known? We are seeing this behavior on all Apalis iMX6 modules,
> > though we don't see it on Colibri iMX6, so it is not SoC-specific.
Hi Leonardo:
Can you try this fixes commit?
https://lore.kernel.org/imx/20260707062250.GA20259@francesco-nb/T/#m06ea82923d53e28a234d0052596559eaa2c64987

Best Regards
Richard Zhu
> 
> Can you help bisect to locate which commit cause this problem?
> 
> Frank
> 
> >
> > Logs from v7.2-rc1 (not working, printing stops after the last line
> > pasted
> > here):
> >
> >     [    0.000000] Booting Linux on physical CPU 0x0
> >     [    0.000000] Linux version 7.2.0-rc1-0.0.0-devel (oe-user@oe-host)
> (arm-tdx-linux-gnueabi-gcc (GCC) 16.1.0, GNU ld (GNU Binutils) 2.46.1) #1
> SMP PREEMPT Sun Jun 28 19:01:31 UTC 2026
> >     [    0.000000] CPU: ARMv7 Processor [412fc09a] revision 10 (ARMv7),
> cr=10c5387d
> >     [    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing
> instruction cache
> >     [    0.000000] OF: fdt: Machine model: Toradex Apalis iMX6Q/D Module
> on Apalis Evaluation Board
> >     [    0.000000] Memory policy: Data cache writealloc
> >     [    0.000000] cma: Reserved 256 MiB at 0x40000000
> >     [    0.000000] OF: reserved mem: Reserved memory: No reserved-memory
> node in the DT
> >     [    0.000000] Zone ranges:
> >     [    0.000000]   Normal   [mem 0x0000000010000000-
> 0x000000003fffffff]
> >     [    0.000000]   HighMem  [mem 0x0000000040000000-
> 0x000000004fffffff]
> >     [    0.000000] Movable zone start for each node
> >     [    0.000000] Early memory node ranges
> >     [    0.000000]   node   0: [mem 0x0000000010000000-
> 0x000000004fffffff]
> >     [    0.000000] Initmem setup node 0 [mem 0x0000000010000000-
> 0x000000004fffffff]
> >     [    0.000000] percpu: Embedded 15 pages/cpu s28684 r8192 d24564
> u61440
> >     [    0.000000] Kernel command line: root=PARTUUID=adb2cea1-02 ro
> rootwait console=tty1 console=ttymxc0,115200
> >     [    0.000000] printk: log buffer data + meta data: 131072 + 409600 =
> 540672 bytes
> >     [    0.000000] Dentry cache hash table entries: 131072 (order: 7, 524288
> bytes, linear)
> >     [    0.000000] Inode-cache hash table entries: 65536 (order: 6, 262144
> bytes, linear)
> >     [    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: 262144
> >     [    0.000000] mem auto-init: stack:all(zero), heap alloc:off, heap free:off
> >     [    0.000000] SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=4,
> Nodes=1
> >     [    0.000000] rcu: Preemptible hierarchical RCU implementation.
> >     [    0.000000] rcu:     RCU event tracing is enabled.
> >     [    0.000000]  Trampoline variant of Tasks RCU enabled.
> >     [    0.000000]  Tracing variant of Tasks RCU enabled.
> >     [    0.000000] rcu: RCU calculated value of scheduler-enlistment delay is 10
> jiffies.
> >     [    0.000000] RCU Tasks: Setting shift to 2 and lim to 1
> rcu_task_cb_adjust=1 rcu_task_cpu_ids=4.
> >     [    0.000000] NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16
> >     [    0.000000] L2C-310 errata 752271 769419 enabled
> >     [    0.000000] L2C-310 enabling early BRESP for Cortex-A9
> >     [    0.000000] L2C-310 full line of zeros enabled for Cortex-A9
> >     [    0.000000] L2C-310 ID prefetch enabled, offset 16 lines
> >
> >
> > Logs from v7.1 (working) (full logs here:
> >
> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpast
> >
> e.debian.net%2Fhidden%2F0f65ae5f&data=05%7C02%7Chongxing.zhu%40
> nxp.com
> > %7Ca4fdd946d8064da8b63d08ded61bab42%7C686ea1d3bc2b4c6fa92cd
> 99c5c301635
> > %7C0%7C0%7C639183611522973764%7CUnknown%7CTWFpbGZsb3d8e
> yJFbXB0eU1hcGki
> >
> OnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjo
> yfQ
> > %3D%3D%7C0%7C%7C%7C&sdata=s3LVv01DMUor2Kwv25bOMyk8Q5oFs
> qBhUVx6Odozwp4%
> > 3D&reserved=0)
> >
> >     [    0.000000] Booting Linux on physical CPU 0x0
> >     [    0.000000] Linux version 7.1.0-0.0.0-devel (oe-user@oe-host) (arm-
> tdx-linux-gnueabi-gcc (GCC) 16.1.0, GNU ld (GNU Binutils) 2.46.1) #1 SMP
> PREEMPT Wed Jun 24 01:36:41 UTC 2026
> >     [    0.000000] CPU: ARMv7 Processor [412fc09a] revision 10 (ARMv7),
> cr=10c5387d
> >     [    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing
> instruction cache
> >     [    0.000000] OF: fdt: Machine model: Toradex Apalis iMX6Q/D Module
> on Apalis Evaluation Board
> >     [    0.000000] Memory policy: Data cache writealloc
> >     [    0.000000] cma: Reserved 256 MiB at 0x40000000
> >     [    0.000000] OF: reserved mem: Reserved memory: No reserved-memory
> node in the DT
> >     [    0.000000] Zone ranges:
> >     [    0.000000]   Normal   [mem 0x0000000010000000-
> 0x000000003fffffff]
> >     [    0.000000]   HighMem  [mem 0x0000000040000000-
> 0x000000004fffffff]
> >     [    0.000000] Movable zone start for each node
> >     [    0.000000] Early memory node ranges
> >     [    0.000000]   node   0: [mem 0x0000000010000000-
> 0x000000004fffffff]
> >     [    0.000000] Initmem setup node 0 [mem 0x0000000010000000-
> 0x000000004fffffff]
> >     [    0.000000] percpu: Embedded 15 pages/cpu s28684 r8192 d24564
> u61440
> >     [    0.000000] pcpu-alloc: s28684 r8192 d24564 u61440 alloc=15*4096
> >     [    0.000000] pcpu-alloc: [0] 0 [0] 1 [0] 2 [0] 3
> >     [    0.000000] Kernel command line: root=PARTUUID=4ce4ba92-02 ro
> rootwait console=tty1 console=ttymxc0,115200
> >     [    0.000000] printk: log buffer data + meta data: 131072 + 409600 =
> 540672 bytes
> >     [    0.000000] Dentry cache hash table entries: 131072 (order: 7, 524288
> bytes, linear)
> >     [    0.000000] Inode-cache hash table entries: 65536 (order: 6, 262144
> bytes, linear)
> >     [    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: 262144
> >     [    0.000000] mem auto-init: stack:all(zero), heap alloc:off, heap free:off
> >     [    0.000000] SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=4,
> Nodes=1
> >     [    0.000000] rcu: Preemptible hierarchical RCU implementation.
> >     [    0.000000] rcu:     RCU event tracing is enabled.
> >     [    0.000000]  Trampoline variant of Tasks RCU enabled.
> >     [    0.000000]  Tracing variant of Tasks RCU enabled.
> >     [    0.000000] rcu: RCU calculated value of scheduler-enlistment delay is 10
> jiffies.
> >     [    0.000000] RCU Tasks: Setting shift to 2 and lim to 1
> rcu_task_cb_adjust=1 rcu_task_cpu_ids=4.
> >     [    0.000000] NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16
> >     [    0.000000] L2C-310 errata 752271 769419 enabled
> >     [    0.000000] L2C-310 enabling early BRESP for Cortex-A9
> >     [    0.000000] L2C-310 full line of zeros enabled for Cortex-A9
> >     [    0.000000] L2C-310 ID prefetch enabled, offset 16 lines
> >     [    0.000000] L2C-310 dynamic clock gating enabled, standby mode
> enabled
> >     [    0.000000] L2C-310 cache controller enabled, 16 ways, 1024 kB
> >     [    0.000000] L2C-310: CACHE_ID 0x410000c7, AUX_CTRL 0x76470001
> >     [    0.000000] rcu: srcu_init: Setting srcu_struct sizes based on contention.
> >     [    0.000000] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff,
> max_idle_ns: 19112604462750000 ns
> >     [    0.000000] Switching to timer-based delay loop, resolution 333ns
> >     [    0.000001] sched_clock: 32 bits at 3000kHz, resolution 333ns, wraps
> every 715827882841ns
> >     [    0.000018] clocksource: mxc_timer1: mask: 0xffffffff max_cycles:
> 0xffffffff, max_idle_ns: 637086815595 ns
> >     [    0.001910] Console: colour dummy device 80x30
> >     [    0.001926] printk: legacy console [tty1] enabled
> >     [    0.002519] Calibrating delay loop (skipped), value calculated using timer
> frequency.. 6.00 BogoMIPS (lpj=30000)
> >     [    0.002561] CPU: Testing write buffer coherency: ok
> >     [    0.002627] CPU0: Spectre v2: using BPIALL workaround
> >     [    0.002650] pid_max: default: 32768 minimum: 301
> >     [    0.002989] Mount-cache hash table entries: 2048 (order: 1, 8192
> bytes, linear)
> >     [    0.003038] Mountpoint-cache hash table entries: 2048 (order: 1, 8192
> bytes, linear)
> >     [    0.003430] VFS: Finished mounting rootfs on nullfs
> >     [    0.004538] CPU0: thread -1, cpu 0, socket 0, mpidr 80000000
> >     [    0.006552] Setting up static identity map for 0x10100000 -
> 0x10100060
> >     [    0.006835] rcu: Hierarchical SRCU implementation.
> >     [    0.006864] rcu:     Max phase no-delay instances is 1000.
> >     [    0.007320] Timer migration: 1 hierarchy levels; 8 children per group; 1
> crossnode level
> >     [    0.008854] smp: Bringing up secondary CPUs ...
> >     [    0.010035] CPU1: thread -1, cpu 1, socket 0, mpidr 80000001
> >     [    0.010218] CPU1: Spectre v2: using BPIALL workaround
> >     [    0.011412] CPU2: thread -1, cpu 2, socket 0, mpidr 80000002
> >     [    0.011581] CPU2: Spectre v2: using BPIALL workaround
> >     [    0.012747] CPU3: thread -1, cpu 3, socket 0, mpidr 80000003
> >     [    0.012917] CPU3: Spectre v2: using BPIALL workaround
> >     [    0.013109] smp: Brought up 1 node, 4 CPUs
> >     ...
> >