mqxboot questions

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mqxboot questions

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Senior Contributor II

Hello,

I encounter difficulties to load and run M4 applications from linux with mqxboot. Applications works fine from debugger.

I build (successfully) and I tried mcc-pingpong demo without success (from timesys wiki).

From Timesys wiki the commande line is : mqxboot pingpong_example_twrvf65gs10_m4.bin 0x3f000000 0x3f000485

0x3f000000 is the load address in internal RAM, right?

and 0x3f000485 is the start address (odd address ???).

When I launch this, it crashes linux (have to hard reset).

Which address should I use ?

In the linker map file this line seems to interesting :

0x3f0004e0   0x00000068   Code   RO1055  * . text    psp.a(boot.o)

In this case 0x3f0004e0 seems to be the entry point.

If I try to launch mqxboot /home/demo-items/accelerometer_example_twrvf65gs10_m4.bin 0x3f000000 0x3f000485 (which is already build), it works.

Is there something to do with DS-5, it seems all things I build don't work.

I'm lost, somebody can help me.

Regards,

Emmanuel

Edit :

Now it works but :

- The Start address seems to be the Entry point address + 1

Somebody can explain why "+ 1" ?

1 Solution
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Senior Contributor II

Hi Emmanuel,

The entry point I was referring to is defined at the top of the mapfile - at line 7 for me:

ARM Linker, 5.03 [Build 102]

=========================================================

Memory Map of the image

  Image Entry point : 0x3f0004e1

Section 19.11 in the Vybrid Reference manual specifies that the entry point should always be

odd because the Cortex-M4 supports only Thumb Mode - which I believe is why you needed to

add 1 to the other address you mention.

Thanks,

Timesys Support

View solution in original post

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NXP Employee
NXP Employee

What version of MQX is it?

Btw. karinavalencia, I will on this, but isn't this question better suited for timesyssupport?

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Senior Contributor II

Hello,

It's MQX 4.0.2. Now,  I can run MQX application from linux. I just like to know why start address must be Entry Point Address + 1.

In my case start address wasn't 0x3F0000485, because I compiled MQX with MQX_ROM_VECTORS 0, and I'm not ARM specialist (I'm a 68K old school man).

I don't find documents which explain how to use mqxboot.

Thanks,

Emmanuel

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Senior Contributor II

Hi Emmanuel,

To review, the usage of mqxboot is:

mqxboot <binary MQX image> <load address> <entry point>

You can find both the values of the load address and entry point in mapfile.map generated during the MQX image build. The entry point may not be 0x3f000485 if you have changed any MQX configuration options, so it is a good practice to verify the entry point in the mapfile.

Thanks,

Timesys Support

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Senior Contributor II

Hello,

I understand how to use mqxboot, but why start address must be Entry Point address + 1?

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Senior Contributor II

Hi Emmanuel,

The entry point I was referring to is defined at the top of the mapfile - at line 7 for me:

ARM Linker, 5.03 [Build 102]

=========================================================

Memory Map of the image

  Image Entry point : 0x3f0004e1

Section 19.11 in the Vybrid Reference manual specifies that the entry point should always be

odd because the Cortex-M4 supports only Thumb Mode - which I believe is why you needed to

add 1 to the other address you mention.

Thanks,

Timesys Support

View solution in original post

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Senior Contributor II

hello,

This seems to be a good explanation.

Thanks,

Emmanuel

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NXP Apps Support
NXP Apps Support

timesyssupport can you review this  case and share  your comments?

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