Broadcom Woes with +1 GB of RAM
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux-source-2.6.15 (Ubuntu) |
Fix Released
|
Medium
|
Ben Collins |
Bug Description
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://
Changed in linux-source-2.6.15: | |
status: | Fix Committed → Fix Released |
I have a Dual processor, 2 2Ghz processor... however this bug is not limited to dual processors, methinks, because someone with a Dell Latitude w/ 1.2G of memory reported this too: http://<email address hidden> /msg00882. html