thanks Andrew.
If i use as you said
HD(1,GPT,E3AE6975-BACE-464E-
91E1-BB4FE9954047,0x800,0x31801)/\EFI\BOOT\BOOTAA64.EFI”
grub enter rescue mode.
it is happening since grub is getting loaded, however the prefix and root
are not set properly.
if i set manually, then normal command works.
log:
The default boot selection will start in 1 seconds
Welcome to GRUB!
error: disk `,gpt2' not found.
Entering rescue mode...
grub rescue> insmod normal
error: disk `,gpt2' not found.
grub rescue> set
prefix=(,gpt2)/boot/grub
root=,gpt2
grub rescue> set root=hd0,gpt2
grub rescue> set prefix=(hd0,gpt2)/boot/grub
grub rescue> insmod normal
grub rescue> set
color_highlight=black/light-gray
color_normal=light-gray/black
feature_200_final=y
feature_all_video_module=y
feature_chainloader_bpb=y
feature_default_font_path=y
feature_menuentry_id=y
feature_menuentry_options=y
feature_nativedisk_cmd=y
feature_ntldr=y
feature_platform_search_hint=y
feature_timeout_style=y
grub_cpu=arm64
grub_platform=efi
lang=
locale_dir=
pager=
prefix=(hd0,gpt2)/boot/grub
root=hd0,gpt2
secondary_locale_dir=
grub rescue>
thanks
ganapat
On Thu, Jun 19, 2014 at 11:13 AM, Andrew Fish <[email protected]> wrote:
>
> On Jun 18, 2014, at 10:06 PM, Ganapatrao Kulkarni <[email protected]>
> wrote:
>
> > Hi All,
> >
> > I am trying to boot GRUB present at HARD-DISK connected over PCI and in
> AHCI mode.
> > I am able to boot by setting default boot path as below.
> >
> >
> gArmPlatformTokenSpaceGuid.PcdDefaultBootDevicePath|L"PciRoot(0x1)/Pci(0x0,0x0)/Sata(0x0,0x0,0x0)/HD(1,GPT,E3AE6975-BACE-464E-91E1-BB4FE9954047,0x800,0x31801)/\EFI\BOOT\BOOTAA64.EFI"
> >
> > however, i see the Partition GUID(Partition unique GUID:
> E3AE6975-BACE-464E-91E1-BB4FE9954047) which is part of path changes when
> ever hard disk is repartitioned or created with partition.
> >
> > are there any other way to set the default boot path which is consistent
> and not depends on GUID.
> >
>
> No but you can form the device path like:
> HD(1,GPT,E3AE6975-BACE-464E-91E1-BB4FE9954047,0x800,0x31801)/\EFI\BOOT\BOOTAA64.EFI”
> so that if the hard disk is moved around in the system you can still boot
> from it.
>
> There is no concept of C: or a magic sector in GPT. The 3rd party MBR boot
> managers where causing chaos back in the day as the all tried to grab the
> same hidden sectors on the disk. Also moving a disks location caused the
> system to fail to boot. So GPT was design to solve those problems. There is
> nothing on the disk that that indicates what is bootable, that info is
> stored in EFI NVRAM as it is platform policy.
>
> So when you install a new OS on your system you need to run some kind of
> install program to set the EFI NVRAM boot variable.
>
> The BDS processes the EFI boot variables, and it looks like that PCD is
> used to set a default value. What happens if no bootable variables resolve
> is platform policy. So you could implement a custom boot manager that does
> some magic. For example you could define a PartitionTypeGUID that
> represents an EFI Application (OS Loader) that helps the user select which
> partition on the disk should be bootable. Or you could set the platform
> policy to network boot if the hard drive boot fails, and have the system
> run an EFI Application that helps you setup (or provision) the boot options.
>
> Thanks,
>
> Andrew Fish
>
> > thanks
> > Ganapat
> >
> >
> >
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