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Re: Secrets on UEFI GPT

From wolfgang kern <nowhere@never.at>
Newsgroups alt.os.development
Subject Re: Secrets on UEFI GPT
Date 2024-02-09 15:31 +0100
Organization A noiseless patient Spider
Message-ID <uq5cvj$2lrhf$1@dont-email.me> (permalink)
References <uofhej$3hlj6$1@dont-email.me> <up2g4d$3ajrq$1@dont-email.me>

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because nobody responded to my questions and I couldn't find anything on 
the net it seems some parts of the story are intentional well hidden.
So now I have to try and fail, which may cost me several month.
And whenever/if at all I find these missing info I will keep it a secret 
as well.

On 27/01/2024 09:50, I wrote:
> my attempt to manually create a complete UEFI startup with KESYS hexwork
> still encounter many obstacles :)
> QUESTIONS still are:  what should I enter into
> 1. the 64 bit Disk GUID (also referred as UUID on UNIXes)?
> 2. the 64 bit GUID for FAT32 start partition (first entry in LBA_2)?
> 3. is it really required to waste 33 sectors for never used entries?
>     or would my short (only one sector) solution work as well?
> 
> please tell me what I may have missed and what's different to your
> settings.
> TIA
> __
> wolfgang
> 
>> what I have so far:
>> (almost all is in hex, b/w/q/dq/qq mean 8/16/32/64/128 bit)
> 
> corrected (was off by one):
> LBA_0:          MBR
> 0000...         all Zero
> 01BE 01         BootIndicator
>     Set to 0x00 to indicate a non-bootable partition.
>     If set to any value the behavior of this flag on non-UEFI systems is 
> undefined.
>     Must be ignored by UEFI implementations.
> 01BF 00 02 00   StartingCHS ;means LBA_01
> 01C2 EE         OSType (i.e GPT Protective)
> 01C3 FF FF FF   EndingCHS
> 01C6 q 01       StartingLBA
> 01CA q FFFFFFFF Size of whole disk (in sectors-1); less if smaller
> 01CE ...        remaining Partition Records shall each be set to zeros.
> 01FE 55 AA
> ------------------
>> [LBA_1] GPT header
>> 000 45 46 49 20 50 41 52 54 ;"EFI PART" Signature
>> 008 00 00 01 00   Revision for GPT version 1.0
>>                    (through at least UEFI version 2.3.1),
>> 00C 5C 00 00 00   Header size (in bytes)
>> 010 q  0          CRC32 of header (offset +0 up to header size),
>>                    with this field zeroed during calculation
>> 014 q  0          Reserved; must be zero
>> 018 dq ....       Current LBA (location of this header copy)
>> 020 dq ....       Backup LBA (location of the other header copy)
>> 028 dq 4          First usable LBA for partitions (primary last LBA + 1)
>>      specs say minimum 6 for 4K sectors and 34dec for 512 byte sectors
>>      what a waste ...
>> 030 dq ....       Last usable LBA (secondary partition first LBA - 1)
>> 038 dq ???        Disk GUID (also referred as UUID on UNIXes)
>> 048 dq 2          Starting LBA of array of partition entries
>>                    (always 2 in primary)
>> 050 q  00000004   Number of partition entries in array
>> 054 q  00000080   Size of a single partition entry (usually 128)
>> 058 q  0          CRC32 of partition array
>> 05C..end of sector; all ZERO
>>       (420 bytes for 512 byte sectors; but more with larger sector sizes)
>> ---------------------------
>> [LBA_2] I'd have only four partition entries assigned
>> GUID partition entry format [128 byte each]
>> 000 qq          Partition type GUID
>> 1.    ??? boot part                                    ;FAT32
>> 2.    "KESYS 64 ddmm2024" to be declared global unique ;KESYS64
>> 3.    28 73 C1 2A-1F F8 D2 11  BA 4B 00 A0 C9 3E C9 3B ;EFI
>> 4.    16 E3 C9 E3 5C 0B B8 4D  81 7D F9 2D F0 02 15 AE ;M$ reserved
>>        ???                                              ;or NTFS
>> 010 qq  ???     Unique partition GUID
>> 020 dq  4/x/x/x First LBA (specs say 6 or 34 for first partition)
>> 028 dq          Last LBA (inclusive, usually odd)
>> 030 dq         Attribute flags
>> 038 str        72 bytes Partition name (36 UTF-16LE code units)
>>
>> The 64-bit partition table attributes are shared between 48-bit common 
>> attributes for all partition types, and 16-bit type-specific attributes.
>> <eof>
>

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Thread

UEFI GPT wolfgang kern <nowhere@never.at> - 2024-01-20 05:16 +0100
  Re: UEFI GPT Paul Edwards <mutazilah@gmail.com> - 2024-01-20 23:44 +0800
    Re: UEFI GPT wolfgang kern <nowhere@never.at> - 2024-01-21 00:56 +0100
      Re: UEFI GPT Paul Edwards <mutazilah@gmail.com> - 2024-01-21 10:04 +0800
  Re: UEFI GPT wolfgang kern <nowhere@never.at> - 2024-01-27 09:50 +0100
    Re: Secrets on UEFI GPT wolfgang kern <nowhere@never.at> - 2024-02-09 15:31 +0100
      Re: Secrets on UEFI GPT Herbert Kleebauer <klee@unibwm.de> - 2024-02-09 16:54 +0100
        Re: Secrets on UEFI GPT wolfgang kern <nowhere@never.at> - 2024-02-09 20:08 +0100
          Re: Secrets on UEFI GPT Herbert Kleebauer <klee@unibwm.de> - 2024-02-09 22:03 +0100
            Re: Secrets on UEFI GPT wolfgang kern <nowhere@never.at> - 2024-02-10 05:16 +0100
              Re: Secrets on UEFI GPT wolfgang kern <nowhere@never.at> - 2024-02-10 09:11 +0100
          Re: Secrets on UEFI GPT Paul Edwards <mutazilah@gmail.com> - 2024-02-13 13:57 +0800
            Re: Secrets on UEFI GPT wolfgang kern <nowhere@never.at> - 2024-02-13 08:40 +0100
              Re: Secrets on UEFI GPT wolfgang kern <nowhere@never.at> - 2024-02-13 08:45 +0100
      Re: Secrets on UEFI GPT scott@slp53.sl.home (Scott Lurndal) - 2024-02-09 15:59 +0000
        Re: Secrets on UEFI GPT wolfgang kern <nowhere@never.at> - 2024-02-09 20:12 +0100
          Re: Secrets on UEFI GPT wolfgang kern <nowhere@never.at> - 2024-02-09 20:30 +0100
            Re: Secrets on UEFI GPT scott@slp53.sl.home (Scott Lurndal) - 2024-02-09 20:37 +0000
              Re: Secrets on UEFI GPT wolfgang kern <nowhere@never.at> - 2024-02-10 05:25 +0100
                Re: Secrets on UEFI GPT cross@spitfire.i.gajendra.net (Dan Cross) - 2024-02-10 19:21 +0000
                Re: Secrets on UEFI GPT wolfgang kern <nowhere@never.at> - 2024-02-11 02:00 +0100
          Re: Secrets on UEFI GPT scott@slp53.sl.home (Scott Lurndal) - 2024-02-09 20:34 +0000
            Re: Secrets on UEFI GPT wolfgang kern <nowhere@never.at> - 2024-02-10 05:23 +0100
              Re: Secrets on UEFI GPT "Alexei A. Frounze" <alexfrunews@gmail.com> - 2024-02-09 20:45 -0800
                Re: Secrets on UEFI GPT wolfgang kern <nowhere@never.at> - 2024-02-10 08:59 +0100
                Re: Secrets on UEFI GPT cross@spitfire.i.gajendra.net (Dan Cross) - 2024-02-11 01:11 +0000
                Re: Secrets on UEFI GPT wolfgang kern <nowhere@never.at> - 2024-02-11 07:04 +0100
                Re: Secrets on UEFI GPT cross@spitfire.i.gajendra.net (Dan Cross) - 2024-02-11 20:08 +0000
                Re: Secrets on UEFI GPT wolfgang kern <nowhere@never.at> - 2024-02-11 22:03 +0100
                Re: Secrets on UEFI GPT Andy Valencia <vandys@vsta.org> - 2024-02-11 14:38 -0800
                Re: Secrets on UEFI GPT wolfgang kern <nowhere@never.at> - 2024-02-12 01:48 +0100
      Re: Secrets on UEFI GPT JJ <jj4public@outlook.com> - 2024-02-10 20:10 +0700
        Re: Secrets on UEFI GPT wolfgang kern <nowhere@never.at> - 2024-02-10 17:05 +0100
        Re: Secrets on UEFI GPT wolfgang kern <nowhere@never.at> - 2024-02-14 06:37 +0100

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