[U-Boot-Users] quesions in porting ARMBOOT to the CX821xx(ARM940T)

[dennis fu]

Hi, all

I have some questions in porting the ARMBOOT to the CX821xx(ARM940T).

in the "start_armboot(void)":

1. when I skip two instructions and stop in one point, i.e.
	void start_armboot(void)
	{
	    ...

	    /* initialize environment */
	    //env_init(&bd);       //skip it!!!!

	    ...

	    /* initialize environment */
	    //env_relocate(&bd);   //skip it!!!!

	#if 1 //my code, stop here to get some debug information
	    printf("I am here\n");
	    for(;;);
	#endif

	    ...
	}
My final BIN file is about 13kbytes, and the code works well (can printf all 
information).


But,
2. when I open the two instructions, i.e.
	void start_armboot(void)
	{
	    ...

	    /* initialize environment */
	    env_init(&bd);       //open it!!!!

	    ...

	    /* initialize environment */
	    env_relocate(&bd);   //open it!!!!

	#if 1 //my code, stop here to get some debug information
	    printf("I am here\n");
	    for(;;);
	#endif

	    ...
	}
My final BIN file is about 74kbytes, and the code is broken (no information 
output).


I compare the relevant "armboot.map" files of these two case. The case 2 
includes more
functions than case 1.

My question is:
(1) why these two instructions affect in linking more functions?
(2) I do believe I copy all code from the FLASH into the SDRAM before 
jumping the "start_armboot".
    Why I can run in the low part of code in the SDRAM, but when I call a 
function is far from
    the _START, my code is broken?

The attackments are my two "armboot.map". Could somebody tell me something 
about my question? Because I new man in porting ARMBOOT, I really appreciate 
your help!

Dennis

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