LPC1778 can't start from any IROM Address only 0x0

Oops!!

That's always a risk with hard-coded absolute addresses!

Thanks for taking the time to give the conclusion.

Hi Vladimir,

nice you got it running and thanks for the reply!

BR,
/th.

Hi Vladimir,

Could you just share whart exactly you did to get your code running?

I have my boot code start at 0x00 and app code start at 0x4000. Whenever I download the app code I get similar issue!!
Also, I want to jump from boot to app, I just did that without vector table relocation and it just resets (at the jump instruction it comes back to start of the boot).
Any guesses why it behaves so?

Thanks in advance!
Help appreciated

-Vani

Hello.
As you can see in second message. You have to write correct jump in your application.
And you will need to use "NO CRP" key in your main project settings (Tab "ASM").
And my mistake was is using variables with __attribute__((at(0xxxx))). And if my variable was locate in sector with bootloader, after writing main firmware my bootloader was ereased.

With best regards, Vladimir.

Thanks for the info Vladimir!.
What i have done is- used the jump instruction and it works fine.
Now, I have introduced RTX in my App code - as soon as I do that - the jump does not work fine.
Is there something special that needs to be done in case of RTX in App code?

Boot code goes like this:

typedef  void ( *AppCode )(void);
static const AppCode AppCodeStart = (AppCode)(0x4001);

int     main(void)
{
    __disable_fault_irq( );
    AppCodeStart();
}

When there is no reference to RTX there is no issue. But as soon as I introduce RTX in App code - my jump comes back to the boot

-Vani

Unfortunally i don't use RTX.
And therefore i can't help you in this question.
But when i search in this forum, i found some messages with RTX and bootloader.
Try to use search in this forum.

Hi Vladimir,

Referred to few of your previous posts and the issue is now resolved!
thanks!

-Vani

I think you must to say thanks these people who help me! :-)
With best regards, Vladimir.