Use UEFI Graphics Output Protocol

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bitRAKE

Joined: 21 Jul 2003
Posts: 4073
Location: vpcmpistri

bitRAKE 05 Apr 2022, 10:53

The "-bios" command only loads UEFI firmware with a legacy BIOS payload - sometimes called compatibility mode.

Code:

"{qemu-system-x86_64.exe}" ^
-nodefaults ^
-cpu max ^
-machine q35,smm=on ^
-device bochs-display ^
-device qemu-xhci ^
-device usb-kbd ^
-drive file={edk2-x86_64-code.fd},if=pflash,format=raw,unit=0,readonly=on ^
-drive file=fat:rw:{directory},index=1,media=disk,if=virtio,format=raw

Use the above commandline, but replace all the {} items with your installation settings. UEFI firmware comes with QEMU - in the share folder. Put whatever *.EFI files you want in your {directory}. This will boot right into the EFI shell.

Just updated my install from https://qemu.weilnetz.de/ and tested the above with QEMU version 6.2

Initially, I thought the text modes of the shell were quite limited, but upon configuring a larger graphic resolution in the UEFI bios, the character modes available also changed!

I thought you said that command line worked for you, but then said no success - I don't understand.

_________________
¯\(°_o)/¯ “languages are not safe - uses can be” Bjarne Stroustrup

05 Apr 2022, 10:53

HSE

Joined: 13 Jan 2019
Posts: 15

HSE 05 Apr 2022, 12:38

Perfect now. Fantastic!!

> Initially, I thought the text modes of the shell were quite limited, but upon configuring a larger graphic resolution in the UEFI bios, the character modes available also changed!

A lot to play, I think Very Happy

> I thought you said that command line worked for you, but then said no success - I don't understand.

Tiano Core was loaded, and UEFI SHELL worked without problems. For some reason, versions I was testing failed to boot from USB. That happen also in VirtualBox, where the trick is to mount USB like a Hard Disk. I can't use real Hard Disk because is not FAT32.

Thanks very much.

05 Apr 2022, 12:38

Fulgurance

Joined: 27 Nov 2017
Posts: 276

Fulgurance 13 Apr 2022, 08:45

Hello again. Long time no see !

I have just one question , if somebody can answer it ! This stayed in my mind long time ago !

I read somewhere (don’t ask me where , I don’t remember honestly) the graphic card contain already some functions to show 3D. Like you need less implementation to make 3D engine than in past.

Is it true ? I’m not sure about this information because when I read the UEFI documention, I didn’t see anything relating that .

(I hope you can see some progress with my English, I just come back after 1 year in London )

13 Apr 2022, 08:45

bitRAKE

Joined: 21 Jul 2003
Posts: 4073
Location: vpcmpistri

bitRAKE 13 Apr 2022, 20:45

Graphics cards are massively parallel, but they still need algorithms. As their power has increased the algorithms have changed to make more effective use of that power - sometimes for speed and sometimes for quality.

Graphics card manufactures provide many libraries of algorithms for different domains. They employ large numbers of engineers to build the software systems as well as the hardware.

BTW, your English is excellent, thank you.

_________________
¯\(°_o)/¯ “languages are not safe - uses can be” Bjarne Stroustrup

13 Apr 2022, 20:45

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