Thank you, Greg, I will ask them. I couldn't find relevant information in grub/grub2 docs. And I suppose it is simply impossible because it is not implemented yet. So i think loading OS by kexec is more promising. But initial image must be able to handle situation when root filesystem is at USB HDD. Do you know who is responsible or experienced with linux starting up process? On Tue, Feb 12, 2013 at 6:51 PM, Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> wrote: > On Tue, Feb 12, 2013 at 02:53:46PM +0300, Bob Lemar wrote: >> Hi, guys >> >> I got new SEAGATE Expansion USB 3.0 and want to boot linux from it. >> >> I have successfully booted various linuxes before with different >> loaders from USB thumb flashes. But I cannot do it with this external >> drive. >> >> There are three problems: USB3, 4K sectors and >2TB. >> >> I try grub2 (fedora 17). Grub2 doesn't power on external USB drive. >> The drive is spinning up only after some OS is starting to load after >> grub2. So grub2 and BIOS don't see external HDD. >> >> >> Can someone point me out: >> >> 1. either how to turn on external USB3 driver while computer is in grub2? > > Try asking on the grub2 mailing list, nothing we can do here about that, > sorry. > >> 2. or how to load OS with kexec from external USB3 4K sector drive >> (from OS which is located at internal HDD)? > > The sector size shouldn't matter at all for kexec, although I don't > think that kexec supports booting from USB, but I haven't tried it to > verify it or not. Try asking the kexec developers. > > good luck, > > greg k-h -- Best regards, Bob -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
