Re: Old PowerMac G5 2-socket/2-cores-each: head -r368820 kernel reports: bus_dmamem_alloc failed to align memory properly

Tue Dec 22 05:03:44 UTC 2020

On Mon, Dec 21, 2020, at 10:25 PM, Dennis Clarke via freebsd-ppc wrote:
>
> Well, I had to give it a try :
> 
> https://beta.genunix.com/freebsd/ppc64/power_mac_quad_freebsd_13_current_17_dec_2020_fail.png
> 

Try the following in openfirmware before booting:

dev /memory at 0 100000 1000 do-unmap

There are certain versions of OpenFirmware that leave a page mapped with the wrong protections erroneously and this smells like that bug to me.

> So that is the most recent installer image there. Not sure what fails.
> 

-- 
  Brandon Bergren
  bdragon at FreeBSD.org