What does rmo/tce stand for in powerpc?

[Ryan Wang]

Hi,

In kernel source comments, I saw the words:
''

alloc_top is set to the top of RMO, eventually shrink down if the
<http://lxr.linux.no/linux+*/arch/powerpc/kernel/prom_init.c#L972>TCEs
overlap

''

I wonder what does RMO mean, and TCE?

thanks,
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