[ECOS] Memory layout

[Agarwal, Lomesh]

During startup my flash is at 0 then I unalias it. After unaliasing flash
sits at 0xc4000000 and RAM sits at 0.
What about this:
MEMORY
{
    ram  : ORIGIN = 0x00000000, LENGTH = 0x10000000
    rom  : ORIGIN = 0xc4000000, LENGTH = 0x01000000
}

SECTIONS
{
    SECTIONS_BEGIN
    SECTION_rom_vectors (ram, 0x00000000, LMA_EQ_VMA)   // vector page gets
remapped from ROM to RAM
    SECTION_text (ram, 0x00002000, 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 (rom, 0x20, LMA_EQ_VMA)
    SECTION_data (ram, 0xA000, FOLLOWING (.gcc_except_table))
    SECTION_bss (ram, ALIGN (0x4), LMA_EQ_VMA)
    CYG_LABEL_DEFN(__heap1) = ALIGN (0x8);
//    CYG_LABEL_DEFN(__pci_window) = 0xf00000; . =
CYG_LABEL_DEFN(__pci_window) + 0x100000;
    SECTIONS_END
}

-----Original Message-----
From: Jonathan Larmour [mailto:jlarmour@redhat.com] 
Sent: Wednesday, April 10, 2002 3:22 PM
To: Agarwal, Lomesh
Cc: eCos Discuss
Subject: Re: [ECOS] Memory layout


"Agarwal, Lomesh" wrote:
> 
> Actually I copied and pasted the wrong file.
> My rom.ldi file is as follows:
> MEMORY
> {
>     ram  : ORIGIN = 0x00000000, LENGTH = 0x10000000
>     rom  : ORIGIN = 0x00000000, LENGTH = 0x01000000
> }

These shouldn't overlap. The comments I wrote before about using the
unaliased addresses still holds, so almost certainly your ROM address above
should be different and your platform start up code needs to be
appropriately written to do the unaliasing/remapping.

Jifl
-- 
Red Hat, Rustat House, Clifton Road, Cambridge, UK. Tel: +44 (1223) 271062
Maybe this world is another planet's Hell -Aldous Huxley || Opinions==mine

-- 
Before posting, please read the FAQ: http://sources.redhat.com/fom/ecos
and search the list archive: http://sources.redhat.com/ml/ecos-discuss