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SubjectRe: [PATCH 0/2] ARM: owl: Add CubieBoard6
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Am 11.09.2017 um 02:58 schrieb Andreas Färber:
> With this Device Tree it starts to boot, but it gets stuck during earlycon:
>
> [ 0.899855] cpuidle: using governor ladder
> [ 0.904118] Internal error: Oops - undefined instruction: 0 [#1] PREEMPT SMP ARM
> [ 0.911498] Modules linked in:
> [ 0.914552] CPU: 3 PID: 1 Comm: swapper/0 Not tainted 4.13.0-next-20170908-00003-gbc21950343e1 #38
> [ 0.923486] Hardware name: Generic DT based system
> [ 0.928263] task: ee833840 task.stack: ee834000
> [ 0.932804] PC is at arch_hw_breakpoint_init+0xa0/0x2ac
> [ 0.938015] LR is at arch_hw_breakpoint_init+0x88/0x2ac
> [ 0.943223] pc : [<c09044a0>] lr : [<c0904488>] psr: 60000013
> [ 0.949469] sp : ee835ef8 ip : c09005a0 fp : 00000000
> [ 0.954676] r10: c092e83c r9 : 0000009a r8 : c0939624
> [ 0.959882] r7 : c092e828 r6 : c0a3463c r5 : c0a3463c r4 : 00000001
> [ 0.966388] r3 : 0000000f r2 : 510002d0 r1 : 00000000 r0 : 00000003
> [ 0.972898] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none
> [ 0.980013] Control: 10c5387d Table: 0000404a DAC: 00000051
> [ 0.985740] Process swapper/0 (pid: 1, stack limit = 0xee834218)
> [ 0.991727] Stack: (0xee835ef8 to 0xee836000)
> [ 0.996069] 5ee0: c0a24844 c0a2b47c
> [ 1.004228] 5f00: 00000000 c05adf6c 00000003 c0904400 00000000 c01019f0 0000009a 0000009a
> [ 1.012388] 5f20: eeff7200 eeff72c9 c08a5aec 0000009a 0000009a c0137b54 c08a4ee4 00000000
> [ 1.020546] 5f40: 00000003 00000003 eeff72c9 eeff72d1 c0a0b7f4 00000003 c0a34300 c0a34300
> [ 1.028704] 5f60: 00000003 c0a34300 c0a34300 c0939624 0000009a c0900dd0 00000003 00000003
> [ 1.036862] 5f80: 00000000 c09005a0 00000000 c06d6cac 00000000 00000000 00000000 00000000
> [ 1.045020] 5fa0: 00000000 c06d6cb4 00000000 c01079e0 00000000 00000000 00000000 00000000
> [ 1.053177] 5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
> [ 1.061335] 5fe0: 00000000 00000000 00000000 00000000 00000013 00000000 ffffffff ffffffff
> [ 1.069521] [<c09044a0>] (arch_hw_breakpoint_init) from [<c01019f0>] (do_one_initcall+0x40/0x16c)
> [ 1.078385] [<c01019f0>] (do_one_initcall) from [<c0900dd0>] (kernel_init_freeable+0x144/0x1e0)
> [ 1.087081] [<c0900dd0>] (kernel_init_freeable) from [<c06d6cb4>] (kernel_init+0x8/0x110)
> [ 1.095252] [<c06d6cb4>] (kernel_init) from [<c01079e0>] (ret_from_fork+0x14/0x34)
> [ 1.102807] Code: 0a000002 e3500005 13a04000 ea000001 (ee114e91)
> [ 1.108892] ---[ end trace 7c7f41a8afd53875 ]---
> [ 1.113517] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
>
> The same kernel zImage binary boots fine on Guitar, where I instead get:
>
> [ 0.865476] cpuidle: using governor ladder
> [ 0.866283] hw-breakpoint: found 5 (+1 reserved) breakpoint and 1 watchpoint registers.
> [ 0.866385] hw-breakpoint: maximum watchpoint size is 4 bytes.
>
> I have tested this both with and without owl_secondary_boot(), i.e. my SMP patch series.

If I return from arch/arm/kernel/hw_breakpoint.c like Scorpion does,
then we avoid the undefined instruction, but it just hangs:

[ 0.899948] cpuidle: using governor ladder
[ 0.904215] hw-breakpoint: CubieBoard6 detected. Hardware breakpoints
and watchpoints disabled
[ 132.032547] random: crng init done

Any ideas?

Regards,
Andreas

--
SUSE Linux GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany
GF: Felix Imendörffer, Jane Smithard, Graham Norton
HRB 21284 (AG Nürnberg)

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