This was suggested on an internal newsgroup as a possible solution to
the 540 Linux boot problem.
> I also got the vertical lines when I specified memory larger than what was
> available on my first bank of DIMMS. Apparently, we use some strange sort
> of memory mapping that confuses Linux. So, the question to the guy should
> be if he specified memory size in PROM OSLoadOptions. If so, this is
> probably the cause of his trouble. If he removes the part that says
> "mem=512M" (or whatever), it will default to using 128 MB. If his first
> bank is 256 MB, then he can use that...
- tduffy
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