Hi-
Apparently Matthew (mjg59@srcf.ucam.org) made some modifications to allow booting OS X without Clover. I'm not sure if his changes are current or if they're specific to the X210 which they were made on / for, but I had the same question and that was the answer I got at the time. Never tried it though, I'd suggest you ask him for the details, as I don't have any specifics.

Cheers,
R

On Mon, Jun 8, 2020 at 4:29 PM Keith Hui <buurin@gmail.com> wrote:
To answer the original question, I think not. Not on its own. macOS
needs Clover. Clover needs UEFI. UEFI means Tianocore for payload. So
coreboot+Tianocore+Clover, where Clover would be handled like any
other bootloader eg. grub. I'm not sure if there porting Clover as a
coreboot payload is necessary, practical, or even possible. At the
very least it is a lot of work.

Regards
Keith

> coreboot doesn't boot the OS, it performs hardware initialization and passes control to a payload (SeaBIOS, GRUB, Tianocore, etc. - these are payloads). So you would have to use something like clover anyway.
>
> On 6/8/20 6:22 PM, lol wrote:
>
> Hi, I wanted to ask if coreboot is capable of booting macOS. There are bootloaders like clover and opencore that does the job but does coreboot do this thing with more efficiency?
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