[U-Boot] Booting imx_4.14.98_2.0.0_ga on i.MX8QM MEK Board

[Peng Fan]

Hi Marcel,

> Subject: Booting imx_4.14.98_2.0.0_ga on i.MX8QM MEK Board
> 
> Hi Peng, Stefano and Fabio
> 
> We are currently trying to boot the Linux kernel from NXP's downstream Linux
> BSP 4.14.98_2.0.0_ga with mainline U-Boot. However, that currently seems
> to crash as follows:
> 
> ...
> [    1.563380] 5a090000.serial: ttyLP3 at MMIO 0x5a090010 (irq = 72,
> base_baud = 5000000) is a FSL_LPUART
> [    1.575723] arm-smmu 51400000.iommu: probing hardware
> configuration...
> [    1.582278] arm-smmu 51400000.iommu: SMMUv2 with:
> [    1.586993] Synchronous External Abort: synchronous external abort
> (0x96000210) at 0xffff00000fa40020
> [    1.596233] Internal error: : 96000210 [#1] PREEMPT SMP
> [    1.601458] Modules linked in:
> [    1.604521] CPU: 2 PID: 1 Comm: swapper/0 Not tainted 4.14.98-
> imx_4.14.98_2.0.0_ga+g5d6cbea #1
> [    1.613132] Hardware name: Freescale i.MX8QM MEK (DT)
> [    1.618180] task: ffff8008f6c98000 task.stack: ffff000008068000
> [    1.624119] PC is at arm_smmu_device_probe+0x334/0xc58
> [    1.629256] LR is at arm_smmu_device_probe+0x334/0xc58
> [    1.634399] pc : [<ffff00000865108c>] lr : [<ffff00000865108c>]
> pstate: 40000045
> [    1.641792] sp : ffff00000806bbf0
> [    1.645100] x29: ffff00000806bbf0 x28: ffff0000094dab58
> [    1.650417] x27: 0000000000000007 x26: ffff0000093b046c
> [    1.655733] x25: 0000000000000000 x24: 0000000000000000
> [    1.661050] x23: ffff00000fa40020 x22: ffff8008f72e3410
> [    1.666367] x21: 0000000000000021 x20: ffff00000fa40000
> [    1.671684] x19: ffff8008f78e3218 x18: 0000000000000010
> [    1.677000] x17: 0000000000000001 x16: 0000000000000000
> [    1.682308] x15: ffffffffffffffff x14: ffff0000896a5547
> [    1.687625] x13: ffff0000096a5555 x12: ffff0000094f8df8
> [    1.692942] x11: ffff0000086373a0 x10: ffff00000806b850
> [    1.698259] x9 : 0000000000000006 x8 : 203276554d4d5320
> [    1.703575] x7 : 3a756d6d6f692e30 x6 : 00000000000000e4
> [    1.708892] x5 : 0000000000000000 x4 : 0000000000000000
> [    1.714209] x3 : ffffffffffffffff x2 : ffff000009512f68
> [    1.719526] x1 : ffff8008f6c98000 x0 : 0000000000000025
> [    1.724845] Process swapper/0 (pid: 1, stack limit =
> 0xffff000008068000)
> [    1.731545] Call trace:
> [    1.733994] Exception stack(0xffff00000806bab0 to
> 0xffff00000806bbf0)
> [    1.740441] baa0:
> 0000000000000025
> ffff8008f6c98000
> [    1.748275] bac0: ffff000009512f68 ffffffffffffffff 0000000000000000
> 0000000000000000
> [    1.756111] bae0: 00000000000000e4 3a756d6d6f692e30
> 203276554d4d5320
> 0000000000000006
> [    1.763947] bb00: ffff00000806b850 ffff0000086373a0 ffff0000094f8df8
> ffff0000096a5555
> [    1.771783] bb20: ffff0000896a5547 ffffffffffffffff 0000000000000000
> 0000000000000001
> [    1.779619] bb40: 0000000000000010 ffff8008f78e3218
> ffff00000fa40000
> 0000000000000021
> [    1.787458] bb60: ffff8008f72e3410 ffff00000fa40020
> 0000000000000000
> 0000000000000000
> [    1.795292] bb80: ffff0000093b046c 0000000000000007
> ffff0000094dab58
> ffff00000806bbf0
> [    1.803130] bba0: ffff00000865108c ffff00000806bbf0 ffff00000865108c
> 0000000040000045
> [    1.810964] bbc0: 0000000000000002 ffffffffffffffff ffffffffffffffff
> 0000000000000000
> [    1.818799] bbe0: ffff00000806bbf0 ffff00000865108c
> [    1.823678] [<ffff00000865108c>]
> arm_smmu_device_probe+0x334/0xc58
> [    1.829867] [<ffff0000086da948>] platform_drv_probe+0x58/0xb8
> [    1.835612] [<ffff0000086d8d28>] driver_probe_device+0x210/0x2d0
> [    1.841624] [<ffff0000086d8ea4>] __driver_attach+0xbc/0xc0
> [    1.847117] [<ffff0000086d6e84>] bus_for_each_dev+0x4c/0x98
> [    1.852691] [<ffff0000086d8640>] driver_attach+0x20/0x28
> [    1.858001] [<ffff0000086d8190>] bus_add_driver+0x1b8/0x228
> [    1.863575] [<ffff0000086d9840>] driver_register+0x60/0xf8
> [    1.869057] [<ffff0000086da898>]
> __platform_driver_register+0x40/0x48
> [    1.875502] [<ffff0000093fded4>] arm_smmu_driver_init+0x1c/0x24
> [    1.881424] [<ffff000008083c90>] do_one_initcall+0x38/0x128
> [    1.887004] [<ffff0000093b0d0c>] kernel_init_freeable+0x188/0x22c
> [    1.893102] [<ffff000008da15b8>] kernel_init+0x10/0x108
> [    1.898325] [<ffff000008084ed8>] ret_from_fork+0x10/0x18
> [    1.903637] Code: 911ac021 1a9f17e2 11000442 94020db0 (b94002f7)
> [    1.909748] ---[ end trace c4668f185ae22c3f ]---
> [    1.914394] Kernel panic - not syncing: Attempted to kill init!
> exitcode=0x0000000b
> [    1.914394]
> [    1.923532] SMP: stopping secondary CPUs
> [    1.927458] Kernel Offset: disabled
> [    1.930950] CPU features: 0x180200c
> [    1.934441] Memory Limit: none
> [    1.937501] ---[ end Kernel panic - not syncing: Attempted to kill
> init! exitcode=0x0000000b
> [    1.937501]
> 
> Does any of you know what exactly could be going on?

SMMU is not powered up, so smmu driver probe triggers abort when accessing
SMMU registers. Need power up SC_R_SMMU.

> 
> BTW: The exact same crash is observed on Apalis iMX8 as well, while both the
> i.MX8QXP MEK as well as Colibri iMX8QXP boot that same downstream Linux
> kernel just fine. Must be something i.MX 8QuadMax specific...

There is no SMMU on i.MX8QXP.

Regards,
Peng.

> 
> Cheers
> 
> Marcel