CN102662617A

CN102662617A - Implementing method for VGA (video graphics array) signal switching in KVM (kernel-based virtual machine)

Info

Publication number: CN102662617A
Application number: CN2012100871037A
Authority: CN
Inventors: 吴之光; 金长新; 牛玉峰; 梁智豪
Original assignee: Shandong Chaoyue Numerical Control Electronics Co Ltd
Current assignee: Shandong Chaoyue Numerical Control Electronics Co Ltd
Priority date: 2012-03-29
Filing date: 2012-03-29
Publication date: 2012-09-12

Abstract

The invention relates to the field of computer management and provides an implementing method for VGA (video graphics array) signal switching in a KVM (kernel-based virtual machine). During use of the KVM, when multichannel mainframes are started simultaneously, only the mainframe in the current display channel can read model information of a display through an I2C (inter-integrated circuit) bus in a VGA cable so that a mainframe video card can output VGA signals matched with the display. Therefore, in a VGA display switching circuit design of the KVM, an E2PROM supporting the I2C bus and storing the current display model information is connected onto the I2C bus for the VGA signals of the mainframe in each channel. When being started, the mainframe in the channel directly reads the display model information from the E2PROM of the current channel to substitute for the display to complete a video card configuration process during starting of the mainframe, so that the problems of a blank screen of the display due to mismatching in VGA signal switching and the like are prevented.

Description

The implementation method that the VGA signal switches among a kind of KVM

Technical field

The present invention relates to computer realm, the implementation method that the VGA signal switches among specifically a kind of KVM guarantees normal output at the display end when being used for the switching of KVM main frame VGA signal.

Background technology

Development of computer; Force the computing power index to improve constantly; But the development of computer application field even swifter and more violent than the development of computing machine itself; Single computer can not satisfy the needs of The whole calculations machine system under a lot of occasions, be made up of the system of a perfect in shape and function two or two above computing machines, and huge system even tens computing machines of needs are built jointly.Relate to operation when therefore The whole calculations machine system being managed, if all dispose a cover input-output device separately, not only cause waste, and use very inconvenient at every computing machine of same machine room to each computing machine.In this case; KVM arises at the historic moment; It is only with operation and the management that can accomplish multicomputer once cover keyboard, mouse and display apparatus, and KVM makes multicomputer, and particularly the centralized management of group of server is just more than easily, and this also is the developing direction of group of server aspect centralized management.One of gordian technique among the KVM is exactly the handoff technique of VGA signal; When the VGA signal that starts main frame is switched to current display channel; Because the main frame video card does not read the type information of display when starting, the output of VGA signal does not match and makes display other phenomenons generations such as blank screen occur.Patent art is exactly a kind of implementation method that the VGA signals security switches between multicomputer in KVM.

Summary of the invention

The purpose of this invention is to provide the implementation method that the VGA signal switches among a kind of KVM.

The objective of the invention is to realize like this, on the I2C bus of each passage main frame VGA signal, connect the E2PROM that a slice is supported the I2C bus protocol.

E2PROM on each passage has the current type information that connects display of KVM, and video card reads during in order to each passage host-initiated.

The interior information of E2PROM on each passage is to copy to each E2PROM after the KVM startup control system device reading displayed device model information, thus the interior information of each E2PROM can according to company display different and different.

The accurate read-write of the gordian technique display model information of patent of the present invention is read display and is write E2PROM address correspondence one by one.When a certain byte reads when unsuccessful, controller can repeat to read three times, if unsuccessful then abandon this read operation in three times, can not cover the information that reads of mistake among the E2PROM.

Description of drawings

Fig. 1 is a theory diagram of the present invention;

Fig. 2 is an agreement process flow diagram of the present invention.

Embodiment

According to accompanying drawing the present invention is done following detailed description.

It is one of sub-function module among the KVM that the VGA signal switches.In reference model; I2C bus in each passage VGA signal is as input end signal; The I2C bus of display end VGA is as output end signal; Be responsible for reading of display model information and writing of each passage E2PROM content at the KVM internal controller as I2C communication main equipment, controller also will be controlled the gating that switch unit is accomplished the I2C bus of each passage E2PROM.

The agreement aspect; After controller detected the start that powers on, at first the type information of reading displayed device write each passage E2PROM through switch unit then successively to controller BUFFER; When the type information of controller reading displayed device is unsuccessful, think that then display does not exist or display damage; The type information of the display before the E2PROM that controller can not write each passage overrides, after accomplishing the E2PROM content and writing, the VGA switching initialization of KVM is accomplished; Wait for that exporting initialization after other initial work are accomplished accomplishes alerting signal; Can open each the passage main frame that links to each other with KVM afterwards successively, each main frame video card can read the interior display model information of E2PROM of place passage automatically, the video card configuration when accomplishing host-initiated.

To guarantee to have connected display terminal before KVM starts, behind the electrifying startup KVM, hear initialization completion chimes of doom after, restart the main frame that links to each other with KVM, guarantee to be ready in each passage E2PROM display model information.

This patent of invention is the VGA display technique of computer realm, for KVM equipment provides the switching method of VGA signal, for the handover management of the VGA signal of multicomputer or group of server provides support.

Claims

1. the implementation method that the VGA signal switches among the KVM is characterized in that on the I2C bus of each passage main frame VGA signal, connecting the E2PROM that a slice is supported the I2C bus protocol.

2. method according to claim 1 is characterized in that the E2PROM on each passage has the current type information that connects display of KVM, and video card reads during in order to each passage host-initiated.

3. like claim 1 and 2 said methods; The interior information that it is characterized in that the E2PROM on each passage is to copy to each E2PROM after the KVM startup control system device reading displayed device model information, thus the interior information of each E2PROM can according to company display different and different.