Failed to read memory @ address 0xFFFFFFFE STM32L476RG

[DisruptiveNL]

I get a warning when building Nuttx in Eclipse. (picture taken)

Failed to read memory @ address 0xFFFFFFFE

https://www.st.com/content/ccc/resource/technical/document/reference_manual/02/35/09/0c/4f/f7/40/03/DM00083560.pdf/files/DM00083560.pdf/jcr:content/translations/en.DM00083560.pdf

CRC Register?

What could this mean?

Thanks in advance.

Ben

[Dave Marples]

It's just trying to read a location that doesn't really exist. Add 'set inaccessible by default off' (from memory...exact syntax may need attention) to your gdb startup options and it should go away...but it will still be reading junk cos there's nothing there. 

That address is in something that gdb is trying to read the contents of (pointer to a memory location, LR, PC etc) which can happen on boot or anytime you break regular flow through a swi, interrupt, exception etc.  If I remember correctly the whole set of 0xFFFFFFFx addresses have special meaning in LR, that I cannot remember the detail of, about how you can to be at this address (power on reset, exception etc etc) which allows the CPU to do things like switch stack and go from protected to user mode. A plough through https://developer.arm.com/docs/ddi0403/e/armv7-m-architecture-reference-manual will allow you to become a proper cortex bore at parties....

Regards

Dave 

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[DisruptiveNL]

Thanks, Dave! That's clear!

Op zondag 4 augustus 2019 16:20:31 UTC+2 schreef Dave Marples:

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[David Sidrane]

Hi Ben,

 

Did you get the device in setting under C/C++ Build?

 

You can also try and delete all watches, and break points within eclipse?

 

David

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[DisruptiveNL]

I did David thank you for pointing this out!

Now using nuttx.hex and not nuttx (or nuttx.elf) then I am not getting the WARNING: Failed to read memory @ address 0xFFFFFFFE. (I mean in the Debug Configurations->

Main->C/C++ Application field.) So I say fixed ;-) Thanks!

Op maandag 5 augustus 2019 14:06:47 UTC+2 schreef David Sidrane:

Hi Ben,

 

Did you get the device in setting under C/C++ Build?

 

You can also try and delete all watches, and break points within eclipse?

 

David

 

From: nu...@googlegroups.com [mailto:nu...@googlegroups.com] On Behalf Of DisruptiveNL
Sent: Sunday, August 04, 2019 5:52 AM
To: NuttX
Subject: [nuttx] Failed to read memory @ address 0xFFFFFFFE STM32L476RG

 

I get a warning when building Nuttx in Eclipse. (picture taken)

 

Failed to read memory @ address 0xFFFFFFFE

 

https://www.st.com/content/ccc/resource/technical/document/reference_manual/02/35/09/0c/4f/f7/40/03/DM00083560.pdf/files/DM00083560.pdf/jcr:content/translations/en.DM00083560.pdf

CRC Register?

 

What could this mean?

 

Thanks in advance.

Ben

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[DisruptiveNL]

The hex file cannot be debugged, but it pointed out the problem for me.

My setting screenshots for the settings in Eclipse, which give a working solution without warnings are attached.

Op woensdag 7 augustus 2019 00:12:41 UTC+2 schreef DisruptiveNL:

[David Sidrane]

Hi Ben,

 

You should use the nuttx file that is an elf.

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[Disruptive Solutions]

Yes. Its in the screenshots.

Verstuurd vanaf mijn iPhone

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[DisruptiveNL]

I made a video series how to setup a toolchain in VirtualBox with Ubuntu and Eclipse and J-Link (SEGGER) for Nuttx. Maybe it can also benifit others?

https://www.youtube.com/channel/UCKsSePEEUaRAmv2-S2x0C7w

Ben

[Gregory Nutt]

> I made a video series how to setup a toolchain in VirtualBox with Ubuntu and Eclipse and J-Link (SEGGER) for Nuttx. Maybe it can also benifit others?
>
> https://www.youtube.com/channel/UCKsSePEEUaRAmv2-S2x0C7w

I recently added your YouTube channel to the Wiki tutorials section:
http://www.nuttx.org/doku.php?id=wiki:getting-started:external-tutorials