PCI or PCIE equipment, data access method and related components

Abstract

The invention discloses PCI (Peripheral Component Interconnect) equipment or PCIE (Peripheral Component Interconnect Express) equipment, a data access method and related components. The method comprises the following steps: establishing address mapping between an equipment memory of the equipment and a host memory of a host; partitioning preset data stored in the equipment according to the size of the memory of the equipment to obtain a plurality of data blocks; and executing the following actions on each data block: loading the data block into the equipment memory according to the address of the data block in the preset data, so that the data block is transmitted into the host memory according to the address mapping. According to the method, the preset data are blocked and then loaded into the equipment memory one by one so that the host can read the data one by one, the purpose of completely reading all the preset data is finally achieved, the process does not require that all the preset data are stored in the device memory at a time, additional hardware and chip logic modification is avoided, the whole method is achieved on a PCI / PCIE layer, other logic protocols are not involved, the maximum compatibility and conciseness of the system can be ensured, and the method is suitable for data interaction of initial states of various devices.

Description

Technical field[0001]The present invention relates to the field of PCI / PCIe data transmission, and more particularly to a PCI device or a PCIe device, a data access method, and a related components.Background technique[0002]Due to the variety of PCI (Peripheral Component Interconnect, Peripheral Component Interconnect, Peripheral Component Interconnect Express) / PCIe (Peripheral Component Interconnect Express, the latest bus and interface standard) function equipment, the power-on initial boot program of the motherboard cannot cover initialization procedures for all devices. , Thus causing the case where new devices cannot be identified. In order to solve this problem, the PCI / PCIe protocol provides a mechanism EXPANSION ROM (subsequent simply refer to EXPROM), which is set in the device, which is the main board and device link, EXPROM builds host and device ROM (Read-Only Memory, read-only Memory or RAM (Random Access Memory, Random Access Memory), and store the initial boot p...

AI Technical Summary

Problems solved by technology

[0003] This mechanism requires the device to provide enough ROM or RAM resources to accommodate the entire initial boot program at one time. If the internal ROM or RAM resources of the device are limited, an external ROM memory is required, which is expensive and rarely used in subsequent device work. cause a large waste of resources

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