disable efficient-cores or performance-cores in Intel 12th gen processors

[baptx]

Hello,

For people who use the 12th generation of Intel Core processors, they may
want to disable efficient-cores in the BIOS to improve performance (
https://www.reddit.com/r/intel/comments/thp7jh/disabling_the_efficiency_core...),
is it supported by coreboot or Dasharo?

Some people may also want to disable performance-cores instead to save more
battery (
https://www.reddit.com/r/overclocking/comments/x0xu1c/can_you_disable_perfor...),
is it supported also?

If some of these disabling option are not available, is there any plan to
support them and is there a workaround currently?

Thanks.