[U-Boot] [PATCH] powerpc: do not fixup NULL ptrs

[Schwarz,Andre]

Wolfgang,



Wolfgang Denk <wd at denx.de> hat am 24. Oktober 2010 um 22:18 geschrieben:

> Dear "Schwarz,Andre",
>
> In message <1702240919.111.1287950899754.JavaMail.open-xchange at proteus> you
> wrote:
> >
> > Since I assume Wolfgang won't accept a board specific "add 4 nops after
> > _start"-patch I'd like to solve this without trial and error.
>
> To the best of my knowledge no board made use f this "warmboot" entry
> point. OK, I wasn't aware that Jocke obviously did something lioke
> this, so there might be other boards as well - but it's unlikely.
>
> > Of course digging into this is beyond my knowledge and any help would be
> > appreciated.
> > I simply can't think of being the only one having this issue...
>
> Check how your board implements the "reset" command - I cannot see any
> specific code for that in your sources, so it looks mostly harmless to
> me. 
this is what I don't understand :
 
The broken boards are *dead*, i.e. no single character on the serial line.
To me this means even the initial code running from flash isn't executed
properly.
IMHO this doesn't look like something like a problem after relocation ... it's
something more fundamental.
 
The boards in question are using low boot, i.e. reset vector @ 0x100.
There's normal power-on-reset sequencing and no such thing like a reboot or
"warm" reset.
 
Without that patch the boards are running fine.

I can see no obvious difference between working and broken boards.

I'd be happy to hear that the error is caused by something hidden within board
specific code.

Reards,
André

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