Can't use 16GB RAM in G5

[Andreas Tobler]

On 19.04.13 03:12, Justin Hibbits wrote:
> Just bought some fancy 12GB RAM for my G5 (late 2005, DC 2.3GHz), to
> bring the total to 16GB.  But, if I max it out, the boot hangs after:
> 
> KDB: current backend: ddb

Here too, but only sometimes, 14GB in a quad. Power cycle up to 3/4
times and then it boots successfully. Once it booted it is rock stable.

> Sits there, then the fans start spinning up.  Removing the outer two
> sticks makes it boot completely, but then I only have 12GB.  I know all
> sticks work, and that the outer two slots work, from testing for a bad
> stick earlier.
> 
> Any known issues with that much memory?  Has anyone tried it on ppc?
> Methinks there's something involved with the pmap code, but I know
> nothing about that code.

I didn't bother so far. My uptime is around half a day a week.

Andreas