[U-Boot-Users] Coldfile 5282 - Hello_world again

[U-Boot-Users] Coldfile 5282 - Hello_world again

[Jens Scharsig]

Hello

I am back again on u-boot.
I can't run the have the hello_world example. I get exceptions after 
start it. So I diassemble and discover the code.
I think the entry point is fault or the initcode is missed.

...
int hello_world (int argc, char *argv[])
{
    20000:	4e56 0000      	linkw %fp,#0
	int i;

	/* Print the ABI version */
	app_startup(argv);
    20004:	2f2e 000c      	movel %fp@(12),%sp at -
    20008:	206d 000c      	moveal %a5@(12),%a0
    2000c:	4e90           	jsr %a0@
...

a0 should load with be contains 00020134

...
00020134 <app_startup>:

extern unsigned long __bss_start, _end;

void app_startup(char **argv)
{
    20134:	4e56 0000      	linkw %fp,#0
	unsigned long * cp = &__bss_start;
...

but moveal %a5@(12),%a0 gets a different address. How or where to 
initialize the a5 register.

Any sugestions

Thx Jens

[U-Boot-Users] Coldfile 5282 - Hello_world again

[Andrew Wozniak]

Jens Scharsig wrote:
> Hello
> 
> I am back again on u-boot.
> I can't run the have the hello_world example. I get exceptions after 
> start it. So I diassemble and discover the code.
> I think the entry point is fault or the initcode is missed.

You did not says what address you specified for the "go" command. But if 
you "read" the README file, it will show you how to run it properly.

> ...
> int hello_world (int argc, char *argv[])
> {
>    20000:    4e56 0000          linkw %fp,#0
>     int i;
> 
>     /* Print the ABI version */
>     app_startup(argv);
>    20004:    2f2e 000c          movel %fp@(12),%sp at -
>    20008:    206d 000c          moveal %a5@(12),%a0
>    2000c:    4e90               jsr %a0@
> ...
> 
> a0 should load with be contains 00020134
> 
> ...
> 00020134 <app_startup>:
> 
> extern unsigned long __bss_start, _end;
> 
> void app_startup(char **argv)
> {
>    20134:    4e56 0000          linkw %fp,#0
>     unsigned long * cp = &__bss_start;
> ...
> 
> but moveal %a5@(12),%a0 gets a different address. How or where to 
> initialize the a5 register.
> 
> Any sugestions
> 
> Thx Jens
> 
> 
> 
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[U-Boot-Users] Re: Coldfile 5282 - Hello_world again

[Jens Scharsig]

> 
> You did not says what address you specified for the "go" command. But if 
> you "read" the README file, it will show you how to run it properly.
> 

I will read this, but I don't found spezial informations about m68k 
targets in readme.standalone. So i try go 20000 and 20004 to start.
By the way u-boot works well

[U-Boot-Users] Re: Coldfile 5282 - Hello_world again

[Jens Scharsig]

Hello again,

> int hello_world (int argc, char *argv[])
> {
>    20000:    4e56 0000          linkw %fp,#0
>     int i;
> 
>     /* Print the ABI version */
>     app_startup(argv);
>    20004:    2f2e 000c          movel %fp@(12),%sp at -
>    20008:    206d 000c          moveal %a5@(12),%a0
>    2000c:    4e90               jsr %a0@

I think, blame it on my problem is the moveal %a5@(12),%a0.
I can't find any initilalize command for a5 in the hole code.
Has anybody a simple example with a working initialize sequence?

Thx Jens