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RE: Memory layout
- From: "Agarwal, Lomesh" <lomesh dot agarwal at intel dot com>
- To: "'Jonathan Larmour'" <jlarmour at redhat dot com>
- Cc: eCos Discuss <ecos-discuss at sources dot redhat dot com>
- Date: Wed, 10 Apr 2002 15:30:20 -0700
- Subject: RE: [ECOS] Memory layout
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
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