Floating_Point_Unavailable_handler on RS6000 C10

[hush]

hey all, i have an RS6000 C10 that i am trying to get running with my P/390, but i have been having trouble getting it working. i have two CPUs both exhibiting CPU-specific errors, namely the Floating_Point_Unavailable_handler and another L2 cache error (despite no cache module being installed), and am at a loss as to what could be going on. the newest CPU was purchased from a reputable vendor as tested and refurbished. my best guess is that the planar is bad, but does anyone have any other suggestions?

thanks as always!

 

[kev009]

Are these BIST codes on the 3 digit display or errors booting AIX? I would start simple and clean the CPU connector and all the RAM slots with air blast and then maybe IPA+lint free wipes. After that, if no change remove the planar and inspect it with a magnifying glass or microscope.. look for bad traces, loose components, bulging caps.

 

[hush]

these are on the display itself, i get nothing from the machine on the serial line. tearing it all apart and cleaning and inspecting it is on my to-do list, just haven't had the bandwidth x)

 

[kokoboi]

What 3digits error codes you get ?

 

[hush]

i have not booted the machine in a while but working backwards from this document it would seem both errors resolve to error code 208:

208     Floating_Point_Unavailable_handler                                 FATAL
208     Machine check due to an L2 Uncorrectable ECC.

i am guessing it is most likely the planar, i have never tried a CPU with the L2 cache module installed

 

[kokoboi]

As you already tried different board and still get this error, I assume it's 99% a planar problem