OSDev.org

Hi.
I'm working on implementing UEFI graphics output protocol.
I read the GOP structure to get framebuffer size. It works on VMware, but when I change the resolution, the framebuffer size remains the same (3145728 = 3MiB).
Also, the framebuffer size reported by virtualbox is strangely big.

What is the problem?

Thanks in advance.

1024x768x4 = 3MB so that's not surprising.

Your base and size printed in the screenshot look like garbage, which means you're probably not getting that information out correctly.

Actually, the base address is correct (it is hexadecimal). I checked the address by filling the screen.

It is strange because the base address and the framebuffer size information is in the same structure, but only one of them is correct.

And, I meant this strange situation. Even though I changed the resolution to 1920x1080x32, the buffer size remains the same.

Maybe it is related to VMware emulator - only its UEFI firmware.
How does it behave on real hardware?