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From: erik quanstrom <quanstro@labs.coraid.com>
Date: Tue, 12 Jul 2011 12:09:10 -0400
To: 9fans@9fans.net
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Subject: Re: [9fans] Plan9 on QNAP TS-212 NAS (kw)
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> Long ago, you probed by just reading memory until you read back
> nothing but ffffffffffffffffff. That was a memory hole. Then somebody
> at one chipset vendor got clever and broke this test. Oops, you have
> to figure out if maybe your test is failing because somebody got
> clever.

yes, this worked great on x86 until memory got large enough that it
might run right up to something you shouldn't hammer like pci space.
now this probing.

unfortunately socs like the kw require the kernel to program windows
that include chip select bits, and touching memory that's not there is
a fatal bus exception.

- erik