Re: Boot GRUB from USB - potential problem

[Phillip Susi]

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On 12/16/2012 11:54 AM, Aleš Nesrsta wrote:
> Hi,
> 
> I found something not really bad but probably also not good,
> related to booting of GRUB from USB device. I expect it is probably
> (very) low priority thing. Sorry if it was discussed before, I
> didn't notice it.
> 
> Consider this situation: - You have ordinary PC which (BIOS)
> supports boot from USB drive (such as flash disk etc.) - You boot
> GRUB on this PC from some USB device into command line environment 
> - You do "insmod ehci" (or load any other USB module - uhci or ohci
> - it depends what USB host controller Your PC has) - immediately
> after issuing the command above the GRUB freezes
> 
> Why? Because loading of GRUB USB driver stops BIOS support of USB
> device from which You have booted GRUB, i.e. GRUB has no longer
> access to any of its files.

GRUB only needs access to files when you tell it to load them.  You
can load other grub modules you need before ehci, or change the path
grub will load them from after loading ehci by setting the root and
prefix variables.



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