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Subject: LMA XXX Overlaps Previous Sections When Using PHDRS
Date: Wed, 19 Dec 2007 22:19:00 -0000
Message-ID: <3517CACAE247DD498B74D4B65A379E95270856@corpcboemb01.edocorp.com>
From: "DeRosa, Anthony" <Anthony.DeRosa@edocorp.com>
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Hello,

I want to install the contents of an ELF file on a flash device, using
the LMA of the sections (or rather p_paddr of program header) in the ELF
as the addresses in flash.  The VMA and LMA will thus be different.  I
am using "PHDRS" in my linker script in order to specify where the
various sections should be installed on flash.  The problem I am seeing
is the following message:

$ i686-elf-gcc -o test.elf test.S -T link.ld -nostartfiles

/opt/cross-tools/binutils-2.17-gcc-4.1.1-newlib-1.14.0/lib/gcc/i686-elf/
4.1.1/../../../../i686-elf/bin/ld: test.elf: section .section_0 lma
0x1000 overlaps previous sections

/opt/cross-tools/binutils-2.17-gcc-4.1.1-newlib-1.14.0/lib/gcc/i686-elf/
4.1.1/../../../../i686-elf/bin/ld: test.elf: section .section_1 lma
0x1020 overlaps previous sections


Is this a warning, an error, or neither?  Why does it say "lma 0x1000"?
I thought the VMA was 0x1000, and the LMA is 0x4000.

Here is the example code and a contrived linker script.

------------------------------------------------------------------------
----
-- code
------------------------------------------------------------------------
----

.global _start

.section .text_0, "ax"
_start:
    jmp foo

.section .text_1, "ax"
foo:
    jmp foo

------------------------------------------------------------------------
----
-- linker script
------------------------------------------------------------------------
----

ENTRY (_start)

MEMORY=20
{
    ram_0 : ORIGIN =3D 0x00001000, LENGTH =3D 32
    ram_1 : ORIGIN =3D 0x00001020, LENGTH =3D 32
}

PHDRS
{
    phdr_0 PT_LOAD AT (0x4000);
    phdr_1 PT_LOAD AT (0x5000);
}


SECTIONS
{

    .section_0 :
    {=20
        *(.text)
        *(.data)
        *(.bss)
        *(.text_0)=20

    } >ram_0 : phdr_0

    .section_1 :
    {
        *(.text_1)=20
    } >ram_1 : phdr_1
=20=20=20=20
}