[ECOS] Two quections about memory layou of Samsung SNDS

[Roland Caßebohm]

Hello,

for our new platform "ARM Industrial Module AIM 711",
which is very semilar to the snds platform, I use
the following memory layout. Both have fixed_vectors
at 0x20. rom_vectors of the RAM version is at 0x40000
to have enough place for a ROMRAM version of RedBoot.

mlt_arm_aim711_rom:
SECTIONS
{
    SECTIONS_BEGIN
    SECTION_rom_vectors (rom, 0x2000000, LMA_EQ_VMA)
    SECTION_text (rom, ALIGN (0x1), LMA_EQ_VMA)
    SECTION_fini (rom, ALIGN (0x4), LMA_EQ_VMA)
    SECTION_rodata (rom, ALIGN (0x4), LMA_EQ_VMA)
    SECTION_rodata1 (rom, ALIGN (0x4), LMA_EQ_VMA)
    SECTION_fixup (rom, ALIGN (0x4), LMA_EQ_VMA)
    SECTION_gcc_except_table (rom, ALIGN (0x4), LMA_EQ_VMA)
    SECTION_fixed_vectors (ram, 0x20, LMA_EQ_VMA)
    SECTION_data (ram, 0x1000, FOLLOWING (.gcc_except_table))
    SECTION_bss (ram, ALIGN (0x4), LMA_EQ_VMA)
    CYG_LABEL_DEFN(__heap1) = ALIGN (0x8);
    SECTIONS_END
}

mlt_arm_aim711_ram:
SECTIONS
{
    SECTIONS_BEGIN
    SECTION_fixed_vectors (ram, 0x20, LMA_EQ_VMA)
    SECTION_rom_vectors (ram, 0x00040000, LMA_EQ_VMA)
    SECTION_text (ram, ALIGN (0x4), LMA_EQ_VMA)
    SECTION_fini (ram, ALIGN (0x4), LMA_EQ_VMA)
    SECTION_rodata (ram, ALIGN (0x4), LMA_EQ_VMA)
    SECTION_rodata1 (ram, ALIGN (0x4), LMA_EQ_VMA)
    SECTION_fixup (ram, ALIGN (0x4), LMA_EQ_VMA)
    SECTION_gcc_except_table (ram, ALIGN (0x4), LMA_EQ_VMA)
    SECTION_data (ram, ALIGN (0x4), LMA_EQ_VMA)
    SECTION_bss (ram, ALIGN (0x4), LMA_EQ_VMA)
    CYG_LABEL_DEFN(__heap1) = ALIGN (0x8);
    SECTIONS_END
}

Regards,
Roland

On Freitag, 19. MÀrz 2004 03:58, yzj wrote:
> The memory layout in current CVS files:
> 
> mlt_arm_snds_rom
>     SECTIONS_BEGIN
>     SECTION_rom_vectors (rom, 0x1800000, LMA_EQ_VMA)
>     SECTION_text (rom, ALIGN (0x1), LMA_EQ_VMA)
>     SECTION_fini (rom, ALIGN (0x4), LMA_EQ_VMA)
>     SECTION_rodata (rom, ALIGN (0x4), LMA_EQ_VMA)
>     SECTION_rodata1 (rom, ALIGN (0x4), LMA_EQ_VMA)
>     SECTION_fixup (rom, ALIGN (0x4), LMA_EQ_VMA)
>     SECTION_gcc_except_table (rom, ALIGN (0x4), LMA_EQ_VMA)
>     SECTION_fixed_vectors (ram, 0x20, LMA_EQ_VMA)
>     SECTION_data (ram, 0x20000, FOLLOWING (.gcc_except_table))
>     SECTION_bss (ram, ALIGN (0x4), LMA_EQ_VMA)
>     CYG_LABEL_DEFN(__heap1) = ALIGN (0x8);
>     SECTIONS_END
>     
> mlt_arm_snds_ram
>     SECTIONS_BEGIN
>     SECTION_fixed_vectors (ram, 0x200, LMA_EQ_VMA)
>     SECTION_rom_vectors (ram, 0x00020000, LMA_EQ_VMA)
>     SECTION_text (ram, ALIGN (0x4), LMA_EQ_VMA)
>     SECTION_fini (ram, ALIGN (0x4), LMA_EQ_VMA)
>     SECTION_rodata (ram, ALIGN (0x4), LMA_EQ_VMA)
>     SECTION_rodata1 (ram, ALIGN (0x4), LMA_EQ_VMA)
>     SECTION_fixup (ram, ALIGN (0x4), LMA_EQ_VMA)
>     SECTION_gcc_except_table (ram, ALIGN (0x4), LMA_EQ_VMA)
>     SECTION_data (ram, ALIGN (0x4), LMA_EQ_VMA)
>     SECTION_bss (ram, ALIGN (0x4), LMA_EQ_VMA)
>     CYG_LABEL_DEFN(__heap1) = ALIGN (0x8);
>     SECTIONS_END
> 
> focusing on the fixed_vertors section, In the ROM version, which is at
> 0x20 but in RAM version, this section is at 0x200, why?
> Do i need to put the fixed_vectors at the same address in both RAM and ROM
> verson? 
> 
> and I make a RedBoot_ROM, whick is worked very well, and the .data section
> is at 0x20000.  But the mlt_arm_snds_ram put the rom_vector and .text into
> the memory from 0x2000, so if i want to load a eCos test program of RAM
> version, i have to change the memory layout, and change the begin address
> from 0x2000 to a higher address. 
> my understanding is right?


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