Definition from wiki:
An Option ROM typically consists of firmware that is called by the system BIOS.
Give an example of option ROM. BIOS want to initialize video card, but BIOS vendors don't have the data sheet of the video card. They have to call some functions in the Option ROM of video card, and initialize the VGA card.
Usually, functions in Option ROM need to be executed during the real mode.
Like coreboot, most of code are executing at protected mode. So it need to switch back to real mode in order to initialize the VGA.
Showing posts with label Video card. Show all posts
Showing posts with label Video card. Show all posts
Thursday, April 7, 2011
Monday, April 4, 2011
Friday, December 3, 2010
video card
output: Video Graphic Array (VGA), Digital Visual Interface(DVI).
Motherboard Interface:
ISA (Industry Standard Architecture)
PCI (Peripheral Component Interconnect)
AGP (Accelerated Graphics Port)
PCIe (PCI Express)
If you add a video card in your board, It will boot.
But if you remove a video card from your board, and you want to go back to your integrated video card. sometimes X server will not work. You need to reconfigure it, and your machine will have GUI
lsmod | grep radeon
radeon is an open source driver.
Motherboard Interface:
ISA (Industry Standard Architecture)
PCI (Peripheral Component Interconnect)
AGP (Accelerated Graphics Port)
PCIe (PCI Express)
If you add a video card in your board, It will boot.
But if you remove a video card from your board, and you want to go back to your integrated video card. sometimes X server will not work. You need to reconfigure it, and your machine will have GUI
lsmod | grep radeon
radeon is an open source driver.
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