Dear sir, I am using U-boot as a Boot loader for booting Cavium Octeon Processor. My current requirement is to implement Octeon as the PCI bus arbiter i.e. Octeon as a PCI host. Octeon will be responsible for bringing up other processor like Wintegra Winpath Network processor i.e in turn boot the Winpath NP. Octeon will be connected to Winpath over a 32-bit PCI bus. *How can i develop an Uboot application which communicates through Octeon over the PCI bus to Wintegra device such that it transfers data to Winpath device memory address?* *What are the prerequisites i need to write a U-Boot Application to communicate over a PCI bus to talk to a PCI device?* According to my understanding, i need a Winpath Device Driver that needs to be at U-Boot location to communicate to the device over a PCI bus which i need to add to the /Drivers folder path in U-boot Code. Assuming that i have the Driver code for Winpath Device.. how should i proceed further to initiate communication over a PCI bus? I am new to PCI and U-boot, Please guide me through the procedure. If you have any example wherein U-boot is used to talk to a *PCI device*i.e. do a read/write to device's memory location, then please share that example with me. If you have any Internet link which explains similar example then please do share with me. Thanks in advance. Regards, Darshan