The SeaBIOS option ROM for VGA redirection over serial is called sgabios: http://code.google.com/p/sgabios/
It should give you some idea of what's needed. Brian Johnson On 07/25/2013 10:09 AM, Andrew Fish wrote: > > On Jul 24, 2013, at 10:42 PM, Manimehalai Selvaraj > <manimehalai.selva...@lntinfotech.com > <mailto:manimehalai.selva...@lntinfotech.com>> wrote: > >> Hi, >> I am working on developing an UEFI driver for USB to Serial Adapter. >> Following are the functionalities required: >> 1)Attach to an USB to Serial Adapter >> 2)Support terminal/console redirection, i.e, allow Setup screen to be >> redirected and send keyboard activities to setup >> 3)Support DOS, i.e.,redirecting screen from DOS, and pass keys to USB >> serial ports. >> As per my analysis, the project requires writing an UEFI driver that >> will attach to a USB Serial adapter. The driver should produce a >> SerialIO protocol to support console redirection via USB Serial port. Sounds right. >> But I am unable to proceed with supporting USB Serial ports in DOS >> environment. Should it be done by creating a CSM module? Please help >> me regarding this activity. > > This is a 15 year old memory so it might be a little off. Your best bet > is to contact a BIOS Vendor as I'm not sure how to plug all this in is > totally standard. > > So your driver is going to be an SMM plug-in and I'm not sure that USB > in SMM is standard between BIOS vendors... You probably are going to > need an option ROM to chain INT 10/INT 16, and an CSM SMM USB plugin. > > Output from the BIOS will come from two sources: > 1) Chaining into INT 10 so you can see VGA text mode requests for output. > 2) Snoop text mode buffer as code writes to this memory region directly. > It contains ASCII character and attributes, usually at 0xB8000. So you > are going to have to track the changes over time and send out the deltas. > > Input to the BIOS will also need to be injected in two places: > 1) Stuffing info into INT 16 > 2) Stuffing info into 8042 keyboard controller > > Note: Both outputs/inputs are in the form of ASCII character (plus > attributes for output), so you will be responsible for terminal > emulation (PCANSI, VT100, etc) in your driver. > > This is not a mailing list to talk about things legacy BIOS, so you will > need to find something like the SeaBIOS list to discuss legacy BIOS issues. > > Thanks, > > Andrew Fish > >> Thanks, >> Manimehalai S >> >> ------------------------------------------------------------------------ >> The contents of this e-mail and any attachment(s) may contain >> confidential or privileged information for the intended recipient(s). >> Unintended recipients are prohibited from taking action on the basis >> of information in this e-mail and using or disseminating the >> information, and must notify the sender and delete it from their >> system. 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