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Questions tagged [option-rom]

An Option ROM typically consists of firmware that is called by the system BIOS.

An Option ROM typically consists of firmware that is called by the system BIOS. For example, an adapter card that controls a boot device might contain firmware that is used to connect the device to the system once the Option ROM is loaded.

See more at Wikipedia.

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Option Rom code failing to print intended string using Qemu Emulation

Been trying to test out a simple ISA Option Rom program compiled with either FASM or NASM that just prints out a simple 'Hello World' message. Problem is instead of the string being printed I get a couple unexpected characters when testing it out in…
david moheban
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Option rom: PXE design

During the study of the PCI firmware specification and the looking at the existing implementations of the PXE Boot Agents, I had a misunderstanding of how this should work. According to PCI Firmware Specification, during the POST procedure the BIOS…
PBelous
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Demystify Option ROM

I know that option ROM is firmware code on adapter controller which gets initiated at system power-on. My question is, does that firmware code run locally on the adapter controller or on the system CPU? does that code ever need to be in the system…
George Pu
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Debugging options for VGA card option ROM

What debugging options are available for development of a PCIe VGA card option ROM, which can be used in different x86 boards which contain only the legacy BIOS?
Arka Sharma
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Relocation of PCIe Expasion ROM

As per PCIe FW spec 3.1 says Prior to returning control to the BIOS, the Expansion ROM code moves the run-time code What I am currently doing is copying the expansion ROM binary from the temporary location to runtime location(both of which…
Arka Sharma
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How does the bios boot in quit mode?

I have an option rom but the bios doesn't boot unless I press the esc-key and the bios calls the option rom. I want to know how the bios calls the option rom without pressing the esc-key? Does it jump into the same entry point? Especially where is…
Micromega
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