OSDev.org

Hi!
I recently updated VirtualBox to version 6.0.4 and it does not want to boot my OS anymore (it did on version 5.x.x). Also the OS is booting fine in Qemu.
I have tried (almost) every system configuration (I/O APIC enabled/disabled, EFI on/off, Hardware clock in UTC time on/off, Chipset PIIX3 / ICH9).

When booting from a SATA or IDE controller my OS as Optical Drive it says "Could not read from the boot medium!" and when I boot with my OS as a floppy disk it goes into my bootloader and my bootloader tells me it cannot read from disk (my bootloader loads the kernel without a problem in Qemu or even in a real machine).

Any idea why VirtualBox does not want to boot my OS?

Thanks fro your help, regards

LIC wrote:When booting from a SATA or IDE controller my OS as Optical Drive it says "Could not read from the boot medium!"

Are you creating a valid El Torito bootable CD image?

LIC wrote:and when I boot with my OS as a floppy disk it goes into my bootloader and my bootloader tells me it cannot read from disk (my bootloader loads the kernel without a problem in Qemu or even in a real machine).

That means your code is wrong. Most likely, you didn't initialize all of the registers you're using. I can't tell you any more without seeing your code though.

Is the El Torito mandatory? Because I don't remember having to create such a CD with virtualBox version 5 or with my real machine (USB or SATA boot).

Ok, for my bootloader I'll try to fix it on my own and I'll come back on the forum if I can't figure out the issue.

LIC wrote:Is the El Torito mandatory?

It's mandatory for booting from a CD. You don't need it to boot from hard drives or USB flash drives.

LIC wrote:Ok, for my bootloader I'll try to fix it on my own and I'll come back on the forum if I can't figure out the issue.

Good luck!

Okay, thanks!