On May 5, 2009, at 7:56 AM, Morrison, Tom wrote:
Hi Kumar/Michael... Sorry, I really didn't explain myself very well... The Problem (answer to Michael): ================================ We started using a new compiler that upon -O2 optimization - added heavy SPE related instructions into our applications (where the older compiler might not use as many). Once this was done, we started experiencing problems with data being 'shifted' and/or corrupted throughout the applications which didn't immediately cause problems, but either scribbled on someone else's memory and/or bad results... We knew where one of the offending scribbles started (by the shifting by 1 byte of a structure) and found by comparing binaries with 'older' compiler vs. this one that the only major difference was the 'density' of the SPE instructions... As to your question, Kumar: =========================== Naively, I explicitly enabled the SPE in a BSP 'early_init' program (as well as enabling Machine Checks) - which is what I meant by Enabling SPE...
Are you setting MSR_SPE in your own board code? If so stop doing so. There isn't any need or reason to be doing that. MSR_SPE will get set when an application starts using SPE code and the kernel will manage it properly.
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