I will work on the project "Adding QEMU/AArch64 Support to Coreboot" as a GSoC student.
Welcome to coreboot!
Is it ok to communicate with mentors via this mailing list?
Or, is it better to do it via video chat or direct email to avoid too many emails for other members?
I don't think we're having issues with too many mails on the list, so it's really up to you: Some things may be more comfortably discussed in a more private setting, or live (whether that is in public on our IRC chat or in a more private video conference), but when you discuss things in the open, you have the chance to get a wider range of feedback and others get the chance to learn from and with you as well.
Personally I discuss project matters publicly normally, moving to private conversation where it makes sense.
Regards, Patrick