[SeaBIOS] how to enter into cmos-setup of seabios in qemu/kvm

[Laszlo Ersek]

On 01/04/17 11:05, Gerd Hoffmann wrote:
> On Mi, 2017-01-04 at 16:25 +0800, dw wrote:
>> Thanks for your answer!
>> I can enter into cmos-setup when running VMware,so I want to have a try 
>> with qemu/kvm.
>>
>> I have read Seabios's document,found that there were  items that could 
>> be configured with  "qemu-system* --fw_cfg",and only some of items was 
>> related to cmos setup.
> 
> Yes, some of the stuff you usually find in the cmos setup on physical
> hardware (boot device order for example) is configured with qemu command
> line switches instead.
> 
> fw_cfg (shortcut for firmware config) is the name interface used to pass
> this information from qemu to the firmware (be it seabios, ovmf or
> something else).

Also... since VMware has been mentioned a few times, let's address the
elephant in the room: the VMWare host most definitely provides the
virtual machine in question with a firmware binary (a proprietary one at
that) that is implemented and shipped by VMWare. So what *their* virtual
firmware does is 100% independent of what SeaBIOS does.

The virtual firmware is specific to the vendor of the virtualization
platform.

Laszlo