PERFORCE change 135517 for review

[Rafal Jaworowski]

Marcel Moolenaar wrote:
>> Another comment: please note that killing WITH_UBOOT introduces another
>> problem: now both sys/boot/powerpc/uboot/loader and
>> sys/boot/powerpc/ofw/loader are built during buildworld, which may be
>> good
>> from one point of view, but there's no control over which of the
>> loader file
>> is taken during installworld: it seems the last one (u-boot's in this
>> case)
>> overwrites the previous...
> 
> Oh, yeah. We need to rename the U-Boot loader...
> 
> More comments: with 1GB, the API signature is not found. What we
> probably should do is have the platform-specific entry set a
> hint, which can be based on the address of the global data. In
> other words: on PowerPC in start.S, we save r2 and use that to
> control where we're going to search for the API signature.
> 

Ah, so the lowest 256MB constraint which I mentioned in this other email must
have been removed. I like your hint discovery, very nice :-)

Rafal