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From: DrPi <314@drpi.fr>
Subject: Record initialisation question
Date: Sat, 9 Jan 2021 10:30:04 +0100
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Hi,

I'm working on a µP BSP. The boot sequence of this µP requires byte 
structures located in FLASH memory.
For example :

    type t_Dcd_Header is record
       Tag     : Unsigned_8  := 16#D2#;
       Length  : Unsigned_16 := 4;      -- Length in byte of the DCD 
structure (this header included)
       Version : Unsigned_8  := 16#41#;
    end record
      with Object_Size => 32,
           Bit_Order => System.Low_Order_First;

    for t_Dcd_Header use record
       Tag     at 0 range  0 .. 7;
       Length  at 0 range  8 .. 23;
       Version at 0 range 24 .. 31;
    end record;

The t_Dcd_Header is part of t_Dcd record.
The Length field of t_Dcd_Header must contain the length of t_Dcd.

    Dcd : constant t_Dcd :=
     ( Dcd_Header => ( Length => ???, -- Length of Dcd
                       others => <>),
       ...
     );

Is there a way to automatically set Length ?
Dcd goes in a dedicated .txt section.

Nicolas