[ECOS] help me to port mbx860 ethernet

[ECOS] help me to port mbx860 ethernet

[Nohee Ko]

hi.
I'm confused about routine below.
for (init_entry = __RedBoot_INIT_TAB__; init_entry !=
&__RedBoot_INIT_TAB_END__;  init_entry++) {
        (*init_entry->fun)();
    }
this routine are in /redboot/current/src/main.c .

what does this routine do?
It seems to do such like "RedBoot_init or things".
But I can't exactly understand this routine.
where is __RedBoot_INIT_TAB__,  _RedBoot_INIT_TAB_END__ ?
And what does "(*init_entry->fun)()" function do?

My board operates wrong when doing this routine ( actually right after
power on)
then, I can see weird message on my debug monitor.
==> +$T0540:fe00ef04;01:00004a8c;#b2

so please let me know about these things well.

thanks.

RE: [ECOS] help me to port mbx860 ethernet

[Gary Thomas]

On 21-May-2001 Nohee Ko wrote:
> hi.
> I'm confused about routine below.
> for (init_entry = __RedBoot_INIT_TAB__; init_entry !=
> &__RedBoot_INIT_TAB_END__;  init_entry++) {
>         (*init_entry->fun)();
>     }
> this routine are in /redboot/current/src/main.c .
> 
> what does this routine do?
> It seems to do such like "RedBoot_init or things".
> But I can't exactly understand this routine.
> where is __RedBoot_INIT_TAB__,  _RedBoot_INIT_TAB_END__ ?
> And what does "(*init_entry->fun)()" function do?
> 

This is a set of initialization functions, built using the RedBoot_init()
macro.  Each entry in the table is just a function pointer.

> My board operates wrong when doing this routine ( actually right after
> power on)
> then, I can see weird message on my debug monitor.
> ==> +$T0540:fe00ef04;01:00004a8c;#b2

One way to figure out what's happening here is to use GDB.  Once this
error occurs, disconnect from your "terminal" environment (minicom, hyperterm, etc)
and connect using GDB.  Then GDB can let you see what's happening on the board.

  powerpc-eabi-gdb -nw install/bin/redboot.elf
  (gdb) set remotebaud 38400
  (gdb) tar rem /dev/ttyS0
  (gdb) info reg

Another way to find out more would be to add some 'print' statements to
the RedBoot loop:

    for (init_entry = __RedBoot_INIT_TAB__; 
         init_entry != &__RedBoot_INIT_TAB_END__;  init_entry++) {
        printf("Calling init - table: %p, fun: %p\n", init_entry, init_entry->fun);
        (*init_entry->fun)();
    }

> 
> so please let me know about these things well.
> 
> thanks.

Re: [ECOS] help me to port mbx860 ethernet

[Jonathan Larmour]

Nohee Ko wrote:
> 
> hi.
> I'm confused about routine below.
> for (init_entry = __RedBoot_INIT_TAB__; init_entry !=
> &__RedBoot_INIT_TAB_END__;  init_entry++) {
>         (*init_entry->fun)();
>     }
> this routine are in /redboot/current/src/main.c .
> 
> what does this routine do?
> It seems to do such like "RedBoot_init or things".

Yes.

> But I can't exactly understand this routine.
> where is __RedBoot_INIT_TAB__,  _RedBoot_INIT_TAB_END__ ?

They get defined in redboot's main.c:

CYG_HAL_TABLE_BEGIN( __RedBoot_INIT_TAB__, RedBoot_inits );
CYG_HAL_TABLE_END( __RedBoot_INIT_TAB_END__, RedBoot_inits );
extern struct init_tab_entry __RedBoot_INIT_TAB__[],
__RedBoot_INIT_TAB_END__;

You can see the definition of CYG_HAL_TABLE_* in
hal/common/current/include. It manipulates ELF symbols.

> And what does "(*init_entry->fun)()" function do?

It iterates over the contents of the table, calling the function in each
one.
 
> My board operates wrong when doing this routine ( actually right after
> power on)
> then, I can see weird message on my debug monitor.
> ==> +$T0540:fe00ef04;01:00004a8c;#b2

This indicates your board hit an exception at 0xfe00ef04. Perhaps
disassemble your image using powerpc-eabi-objdump -d to find exactly where
this address is.

Jifl
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