UNINIT section gets initialized

Hello,

I am trying to define an RAM area that should not be initialized by the C library init function. I found an old thread about that (http://www.keil.com/forum/11937/) but the proposed solution does not work.

I use a scatter file that define the section like that :

RW_BOOTLOADER 0x10000020 UNINIT 0x0000FFE0  {
        *.o (Bootram)
        *.o (Bootstack)
}

I try to define the area in assembly code or also in C code by :

BLStackSize     EQU     0x00004000
                AREA    Bootstack, NOINIT, READWRITE, ALIGN=3
BLStackMem      SPACE   BLStackSize
BLStackTop

U32 __attribute__((section("Bootstack"),zero_init)) Bootstack[0x1000];

In any case I get the following result in the map file :

    Execution Region RW_BOOTLOADER (Exec base: 0x10000020, Load base: 0x0001ef14, Size: 0x00005030, Max: 0x0000ffe0, ABSOLUTE, UNINIT, COMPRESSED[0x00000024])

    Exec Addr    Load Addr    Size         Type   Attr      Idx    E Section Name        Object

    0x10000020   COMPRESSED   0x00001030   Data   RW          328    Bootram             fiveco_bootloader.o
    0x10001050        -       0x00004000   Zero   RW          329    Bootstack           fiveco_bootloader.o

My understand is that any zero init or uninit area in any section with UNINIT keyword should not be initialized by the C lib as explained in www.keil.com/.../armlink_pge1362075670305.htm

But tests with standard lib (or microlib) with Keil toolchain 5.24.1 show always an initialization by __scatter_zi.o object.

What is wrong in my approach ??

Many thanks by advance !
Antoine