470e4ff3ac
before rev 1.4. This change makes OF 2.4 machines actually boot, and it works fine on my OF 2.01 machine. No reports of failures on other archs. I expect this change is fine as the original code flushed the just-loaded ofwboot out of the cache, conditionalized on FIRMWORKSBUGS. In rev. 1.4, the code got in-lined, and changed to actually flush low memory out of the cache. Since machines kept booting, I expect the firmware was really flushing the binary out of the cache, so we're fine.