2129335_en-US

是

imxrt1061 Hard fault points to clock API call

Good day

I use imxrt1061 running ThreadX RTOS in my project. During the stability runs we occasionally can catch hard fault. It is hard to reproduce it and it occurs under unknown circumstances. It may occur approximately one time per 5000 test runs.

Usually it happens after controlled reboot - all activities are done, reboot initiated, main application (init thread) starts and during init thread execution it may fail

Here is a listing part (all functions inside CLOCK_SetLowSpeed call are located in I-TCM RAM)

601020d0 :
601020d0:	b580      	push	{r7, lr}
601020d2:	af00      	add	r7, sp, #0
601020d4:	f14c fd80 	bl	6024ebd8 <__CLOCK_SystemCoreClockSwitchLowPower_veneer>
601020d8:	f14c fd82 	bl	6024ebe0 <__CLOCK_DeinitArmPll_veneer>
601020dc:	f7ff ff8a 	bl	60101ff4 
601020e0:	2000      	movs	r0, #0
601020e2:	f14c fd3d 	bl	6024eb60 <__CLOCK_DeinitSysPfd_veneer>
601020e6:	2001      	movs	r0, #1
601020e8:	f14c fd3a 	bl	6024eb60 <__CLOCK_DeinitSysPfd_veneer>
601020ec:	2118      	movs	r1, #24
601020ee:	2002      	movs	r0, #2
601020f0:	f14c fd56 	bl	6024eba0 <__CLOCK_InitSysPfd_veneer>
601020f4:	2003      	movs	r0, #3
601020f6:	f14c fd33 	bl	6024eb60 <__CLOCK_DeinitSysPfd_veneer>
601020fa:	f14c fd55 	bl	6024eba8 <__CLOCK_DeinitUsb2Pll_veneer>
601020fe:	f14c fd1b 	bl	6024eb38 <__CLOCK_DeinitAudioPll_veneer>
60102102:	f14c fd11 	bl	6024eb28 <__CLOCK_DeinitVideoPll_veneer>
60102106:	f14c fce3 	bl	6024ead0 <__CLOCK_DeinitEnetPll_veneer>
6010210a:	f14c fd5d 	bl	6024ebc8 <__CLOCK_SystemCoreClockSwitchLowSpeed_veneer>
6010210e:	46bd      	mov	sp, r7
60102110:	e8bd 4080 	ldmia.w	sp!, {r7, lr}
60102114:	f05f be04 	b.w	60161d20

and a stack printout

REBOOT OCCURED\n",
TYPE:     HARD FAULT\n",
--- Stack frame -------------------------------------------------------\n",
 IPSR= 0x00000003 >>>>> HardFault <<<<\n",
 R0  = 0x00000008\n",
 R1  = 0x5018505B\n",
 R2  = 0x400D8000\n",
 R3  = 0x00000080\n",
 R12 = 0x00000280\n",
 LR  = 0x601020E7\n",
 PC  = 0x60102100\n",
 PSR = 0x0100000E\n",
 SP (when faulted)  = 0x20077F08\n",
--- System Control Block (SCB) ----------------------------------------\n",
0x00080000 - CFSR     - Configurable Fault Status Register\n",
 > The processor has attempted to access a coprocessor\n",
0x40000000 - HFSR - HardFault Status Register\n",
 > Forced HardFault\n",
0x411FC271 - CPUID   - CPUID Base Register\n",
0x00481003 - ICSR    - Interrupt Control and State Register\n",
0x60100400 - VTOR    - Vector Table Offset Register\n",
0xFA050000 - AIRCR   - Application Interrupt and Reset Control Register\n",
0x00000000 - SCR     - System Control Register\n",
0x00070200 - CCR     - Configuration Control Register\n",
0x00F00000 - CPACR  - Coprocessor Access Control Register\n",

Please advise how this issue can be localized. Any suggestions are appreciated. Thank you