Hi, I am a embedded system designer and currently working on the preliminary design of a PCIepress expansion board to be used on x86 motherboard. My board is to be an x1 PCie board. Thus according to the PCIe electromechanical specifications, the board may consume 10Watts by default, and 25Watts after correct dialog is established with upper bridges and the root complex. (which after acknowledging the request should send a Slot_Power_Limit message to the board to allow for higher power consumption). The board is based on a PEX8311 PCIe to local bus chip from PLX tech. This component is able to present its request for more power using the power budgeting capability as defined by the PCIe standard. However this doesn’t seems to have effect on the system (running latest ubuntu with 2.6.31 kernel) and from my understanding of the kernel sources this is not supported. Is that correct ? Are there ways that I’m not aware to request for more power in the existing source base ? I’ve been reading the PCIE-port driver source to try to find a way to achieve my goal. My understanding is that this driver is very generic and as such shouldn’t be able to support power budgeting. I believe adding Power budgeting to it would require to match more closely the motherboard hardware. Am I correct ? Perhaps you have better ideas on the subject than me. I’d be very glad if I could get some comments on this issue. I hope I haven’t been writing to the wrong people. Best Regards, Stéphane GONAUER Sofrelog – an EADS company -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
