Booting Imac G5

Benjamin Herrenschmidt benh at
Mon Nov 15 09:07:20 EST 2004

> Here's a quick overview of current kernel status:
> - Pmac PCI IRQ fix: needed for IDE & SATA on
>    Imac G5 (should not break other targets).
> - Ethernet PHY failure if the cable is plugged
>   during boot

Ok, have to check out what's in darwin, there are some bits for the
Shasta chipset that I haven't adapted yet.

> - No RTC

RTC is probably in the SMU...

> - No SMU management
> - Bad detection of frame-buffer virtual res in
>   riva-fb:
>    should use xres=1440 yres=900 &
>    virtual_xres=1536

Ok, weird. Will check that when I get it. Does X "nv" driver work when
booting with offb ?
> - Have to unplug/replug the USB keyboard
>   after kernel boot to make it work with kernel
>   2.6.10-rc1. No such problem with 2.6.9.

There have been various USB related issue in 2.6.10-rc*, have you tried
the latest bk ?

> - Lot's of segfaults occuring when multiple
>   concurent processes are running, especially
>   during compilations. Maybe the RAM is bad
>   (I'm trying to port memtest86 to check this)
>   or the CPU state is not completely saved / 
>   restored when rescheduling: it seems not
>   to occur when compiling without doing
>   anything else concurently.
> Do you have any idea about the last point ? Could this be Altivec
> context save / restore problems ?

I very much doubt it has anything to do with CPU context
saving/restoring... Could be lots of different things, difficult to say
at this point. Thermal problem ? Clock chip setup problem ? Bad
RAMs ? ...


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