All this data gives you the firmware view, but not the OS view. The OS loader
can contain an OS filesystem driver and it may chose to use some OS specific
algorithm to load the kernel from another drive/partition.
Andrew Fish
On Oct 1, 2013, at 9:03 AM, "Carsey, Jaben" <jaben.car...@intel.com> wrote:
> You could also look at the DRIVER???? (DRIVER0001, DRIVER0002, etc…) And
> BOOT???? (BOOT0001, BOOT0002, etc…) UEFI Variables to learn which device
> paths are being used for OS or driver loading (then determine which drives
> these are on). That would not work in all cases where an OS loader is placed
> in a default load location, but should cover most post-OS install instances I
> think.
>
> -Jaben
>
> From: Galla Rao [mailto:gallagnv....@gmail.com]
> Sent: Tuesday, October 01, 2013 8:52 AM
> To: edk2-devel@lists.sourceforge.net
> Subject: Re: [edk2] Is there a way to determine, the disk is GPT and it is
> bootable
>
> Hi Sathya
>
> There is a bit defined in each partition entry, in the fields attributes
> which may be helpful to determine if this partition is bootable
>
> Bit 0 Required Partition
>
> If this bit is set, the partition is required for the platform to function.
> The owner/
> creator of the partition indicates that deletion or modification of the
> contents
> can result in loss of platform features or failure for the platform to boot or
> operate. The system cannot function normally if this partition is removed,
> and it
> should be considered part of the hardware of the system. Actions such as
> running diagnostics, system recovery, or even OS install or boot could
> potentially stop working if this partition is removed. Unless OS software or
> firmware recognizes this partition, it should never be removed or modified as
> the UEFI firmware or platform hardware may become non-functional.
>
> Thanks
> Ranga
>
>
>
> On Tue, Oct 1, 2013 at 9:08 PM, Galla Rao <gallagnv....@gmail.com> wrote:
> Hi Sathya
>
> I think you can try to locate Primary GPT in LBA1 through block IO->Readblock
> and check for signature in the GPT header
>
> Uefi Spec Section
> 5.3.2 GPT Header
> Signature 0 8 Identifies EFI-compatible partition table
> header. This value must contain the ASCII
> string “EFI PART”, encoded as the 64-bit
> constant 0x5452415020494645.
>
> Thanks
> Ranga
>
>
> On Mon, Sep 30, 2013 at 10:58 PM, Prakash, Sathya <sathya.prak...@lsi.com>
> wrote:
> I am writing a shell tool to send some I/O to hard drives. I want to remove
> the OS installed drives from my list of drives to work on. I used to check
> legacy boot drives by reading the MBR and looking for boot partitions. I am
> not able to find a way to identify the GPT based UEFI OS installed disks.
> Any help is appreciated.
>
> Thanks
> Sathya
>
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