How to modify _c_int00 startup code of SYS/BIOS boot module?

Grzegorz Kasinski

Other Parts Discussed in Thread: TM4C129ENCPDT

I am using Sys/Bios with Tiva uC

Before my software starts, I need to execute RAM pattern test for entire memory for that reason I cannot just simply register to one of startup hook function pointers because this code is using stack already (wheres my RAM test overwrites entire memory)

In linker map file I see that _c_int00 startup code is located in boot.oem4f module and it seems, that is different code than boot.asm delivered with standard library. So my question is how can I modify boot.oem4f _c_int00 startup code to meet my needs, it is possible at all when using Sys/Bios?

My configuration:

Tiva TM4c129encpdt

Sys/Bios: 6.37.4.32

XDC tools: 3.25.6.96

CGT: 5.010

Gregor

over 10 years ago

0 Ashish Kapania over 10 years ago

TI__Mastermind 21645 points

Hi Gregor,

You can install your own entry point function that calls _c_int00. Here's an example:

Add to *.c file:
extern void _c_int00();

void myBootFunc()
{
	/* Do Something */
	_c_int00();
}

and

Add "-e myBootFunc" linker option to link line

Best,

Ashish

0 Grzegorz Kasinski over 10 years ago in reply to Ashish Kapania

Prodigy 200 points

Thanks Ashish for quick response It is really simple and working solution :)
Gregor

Processors

Processors forum

How to modify _c_int00 startup code of SYS/BIOS boot module?