[Bug 38912] Broadcom Woes with +1 GB of RAM

[plush]

Public bug reported:

Apparently, my problem wasn't in my procedure in following the steps
given on this forum, it was in installing more RAM!!  I have had
intermittent success using my PowerMac G5's Airport Extreme card, and it
turns out it is because I've switched up how much RAM my system uses
between installs (specifically from 512MB to 1.5GB).

"DMA Engine Bugs
The DMA Engine can only address memory below 1Gb, this seems to be a limitation of the Silicon Backplane used in the Broadcom 44xx chipsets as well. To get around this issue, try to ensure that all memory to be used for DMA is below 1G. In addition, when addressing any memory with the DMA engine, you will need to add 1<<30 to the address. It is believed that the top two bits are used for control, or internal routing, but their exact purpose is unknown."
-http://bcm-specs.sipsolutions.net/DMA

** Affects: linux-source-2.6.15 (Ubuntu)
     Importance: Medium
         Status: Confirmed

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Broadcom Woes with +1 GB of RAM
https://launchpad.net/bugs/38912