Hard Fault When Jumping to MQXv5 Application From Bootloader

BTaylor — Wed, 15 Sep 2021 15:08:29 GMT

I currently have an application using MQXv5 on a custom K66-based board that executes just fine unless I relocate the code from a base of 0x0000 to a base of 0xF000 (to accommodate a bootloader) and then jump to the application entry point (__boot) from the bootloader.

I am using IAR EWARM 9.10 as my IDE.

When jumping to the code from the bootloader, the application raises a hard fault early in the initialization process.

More specifically, a hard fault is raised in __iar_data_init3 due to a data access error.

The Bus Fault Address Register - BFAR - indicates an address of 0x3b10e
The Vector Table Offset Register - VTOR - indicates an address of 0x1fff0000

From the linker map file for my application:

"P1", part 2 of 2: 0x136
Initializer bytes const 0x3'b001 0x10d <for P3 mid-1>
Initializer bytes const 0x3'b10e 0x26 <for rw section .vectors_ram-1>
Initializer bytes const 0x3'b134 0x3 <for KERNEL_DATA-1>
- 0x3'b137 0x136

"A1": 0x400
rw section .vectors_ram-1
0x1fff'0000 0x400 <Init block>
.vectors_ram inited 0x1fff'0000 0x400 vectors.o [4]
- 0x1fff'0400 0x400

My linker file is attached.

Any idea what might be causing the data access error when running the app from the bootloader or what I might do next to further debug the issue?

Thank you.

Re: Hard Fault When Jumping to MQXv5 Application From Bootloader

danielchen — Thu, 23 Sep 2021 08:19:12 GMT

Hi Coldfirefan:

MQX v5 is under commercial license. I would suggest you contact with mqxsales@nxp.com for support.

By default, MQX allocates the vector tale at the first address of the flash memory, 0x0000-0000, Because this region of flash memory is used by your bootloader, it will be necessary to reallocate the vector table in a RAM section.

Please refer to AN4367 for more details. This application note describes how to add the FENT bootloader to kinetis projects. There is a section that includes adding it to the MQX linker which is the section you will find useful.

Regards

Daniel

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Hard Fault When Jumping to MQXv5 Application From Bootloader

Re: Hard Fault When Jumping to MQXv5 Application From Bootloader