rtas instantiation when commandline contains mem

[Benjamin Krill]

>> the rtas instantiation (prom_init.c) doesn't work correctly if the
>> kernel parameter "mem=" is used. The current code doesn't evaluate
>> the kernel parameter which causes the issue that alloc_down
>> allocates somewhere in the "real" memory space. So it can
>> happen that the allocation space is above "mem=".
>> 
>> Commit 2babf5c2ec2f2d5de3e38d20f7df7fd815fd10c9 removes the
>> evaluation of "mem=".
>
>Ah yes, we don't constraint prom_init.c to mem=, only the kernel

Is that with intent? Or should I provide a patch to include it again?

cheers
 ben
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