system routerboard bios set pci-backoff=disabled/enabled.
What does this option do in details ?
I know it's suppose to make wlan nics play more nicely with the routerboards, but how exactly?
The CHANGELOG is as usually very spare on details.
This is from the current manual:
pci back-off – When enabled, external PCI masters can access system memory even when a CPU cycle
has been retried (enabled | disabled; enabled by default). When you are experiencing uncommon problems
with PCI bus (including RouterBOARD is rebooting or hanging up once in a while), try to disable this.
http://www.routerboard.com/PDF/RouterBO ... A4-2-4.pdf
I don't think that this is power option because it happens on ALL setups with multiply cards (from 2 Atheroses only in RB, up to 2 Atheroses and 3 prisms in RB (2 PCMCIA + 1 MiniPCI), and power supplies are diferent (some use PoE and some not, and on almost all instalations I have a diferent power suply (from first routerboard shipments up now).Versions of the RouterBOARD that are clocked at 266MHz have other hardware changes that allow the use of the RB14 and multiple 5212 cards (we will not give details on our design). Back-off has always been enabled -- now you have the option to turn it off.
You should not be having reboots. Probably this is an issue with the power. The RB51 power injector can sometimes hit its max when you have four cards. You can use the new RB53 or soon RB52 -- which allows higher power to the board.
OK. Since RBs are already 266 Mhz models and Atheroses are 5212 , I'll swith all power adapters to a RB53 I have received with last shipment, and upgrade all instalations from 2.86 and up to 2.8.10, and i'll post the presults.I suggest using our current version 2.8.10, RB53 POE or power to jack, and a 266MHz version of the RouterBOARD only with Atheros 5212 chips. There should be no reboots or issues with this configuration. It has been extensively tested here and with many customers.
Tried with PCI Backoff and made a mess out of my day :cry: !!!I'll try with PCI Backoff disabled and I'll let you know is there any improvement.