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Extensible Firmware Interface Specification
10-36 12/01/02 Version 1.10
The EFI_UGA_IO_PROTOCOL operates on UGA_DEVICE objects. Child devices can be
enumerated by using DispatchService()
to send a pIoRequest of type
UgaIoGetChildDevice. A UGA_DEVICE object can be created via a call to
CreateDevice()
with the data returned from UgaIoGetChildDevice.
A video device can support an arbitrary number of geometries, but it must support one of the
following modes to operate with the EFI_UGA_IO_PROTOCOL:
• 800 x 600 with 32-bit color with a 60 Hz refresh rate.
The advanced features of a UGA device are accessible via its DispatchService(). More
information on the advanced capabilities of an EFI 1.10 UGA ROM can be found at
www.microsoft.com/hwdev/uga
.