As stated in documentation http://www.gnu.org/software/grub/manual/grub.html#Multi_002dboot-manual-config and hilighted below, you should use UUID instead of the hdx.
Argument to search after –label is FS LABEL. You can also use UUIDs with –fs-uuid UUID instead of –label LABEL. You could also use direct root=hd0,msdosX but this is not recommended due to device name instability. Regards, Manoel R. Abranches On Fri, Oct 16, 2015 at 11:00 AM Stuart Weaver <stuart.wea...@datapath.co.uk> wrote: > Hi all, > > > > My current setup is a device that has eMMC and occasionally a USB both > with GRUB installed on them via Yocto. All are EFI on an x64 system. > > > > 1. When the USB is disconnected the device boots into the eMMC > > 2. When the USB is connected and chosen via the BIOS, the device > boots into the USB > > 3. When the USB is connected and eMMC is chosen via the BIOS, GRUB > is loaded from the eMMC (checked by deleting the bootx64.efi file on USB) > but chooses the USB grub.cfg file and hence boots into USB > > 4. When USB boot is disabled in BIOS it will load GRUB from eMMC > (checked by deleting the bootx64.efi file on USB) but chooses the USB > grub.cfg file and hence boots into USB > > > > When I go to the grub commandline I can see that: > > > > 1. When USB is disconnected, eMMC appears as (hd0) > > 2. When USB is connected, USB appears as (hd0) and eMMC appears as > (hd1) > > > > I’ve tried trawling the internet and documentation but can’t seem to find > anything detailing how grub enumerates devices. Obviously I would like grub > to look for the grub.cfg file from the device it booted from but can’t seem > to find a solution at the moment! > > > > Could someone detail/point to the process of how grub does the enumeration > (is the information passed through from the BIOS?) and whether USB booting > can be blocked for the grub that is on the eMMC? > > > > Best Regards, > > Stuart > > ______________________________________________________________________ > This email has been scanned by the Symantec Email Security.cloud service. > For more information please visit http://www.symanteccloud.com > ______________________________________________________________________ > _______________________________________________ > Grub-devel mailing list > Grub-devel@gnu.org > https://lists.gnu.org/mailman/listinfo/grub-devel >
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