Building Linux for Coldfire V4

[Markus Königshaus]

Hello,

I try to use the Sourcery G++ Lite 4.2-125 edition to build the Linux 
Kernel 2.6.23 for the MCF54455 Coldfireprocessor. The Kernelsources come 
from the BSP M54455EVB, Release 20071214. The compilation is ok, but 
there is some problem with the linkerscript:

/* ld script to make m68k Coldfire Linux kernel
 *
 * Derived from arch/m68k/kernel/vmlinux-std.lds
 *
 * Updated 11/26/2007 for new CodeSourcery toolset
 *     by Kurt Mahan <kmahan at freescale.com>
 */

#define    LOAD_OFFSET    0x00000000

#include <asm-generic/vmlinux.lds.h>
#include <asm/page_offset.h>

#define    START_OFFSET    0x00020000
#define    IMAGE_START    PAGE_OFFSET_RAW + START_OFFSET

OUTPUT_FORMAT("elf32-m68k", "elf32-m68k", "elf32-m68k")
OUTPUT_ARCH(m68k)
ENTRY(_stext)
jiffies = jiffies_64 + 4;

SECTIONS
{
  . = IMAGE_START;
  .text.head : AT(ADDR(.text.head) - LOAD_OFFSET) {
      _text = .;            /* Text and read-only data */
    *(.text.head)
  } :text = 0x4e75

  .text : AT(ADDR(.text) - LOAD_OFFSET) {
    TEXT_TEXT
    SCHED_TEXT
    LOCK_TEXT
    *(.fixup)
    *(.gnu.warning)
  } :text = 0x4e75
  _etext = .;            /* End of text section */

  . = ALIGN(16);
  __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
    __start___ex_table = .;
    *(__ex_table)
    __stop___ex_table = .;
  }

  RODATA

  . = ALIGN(8192);
  .data : AT(ADDR(.data) - LOAD_OFFSET) {    /* Data */
    DATA_DATA
    CONSTRUCTORS
  } :data

  .bss : AT(ADDR(.bss) - LOAD_OFFSET) {        /* BSS */
    *(.bss)
  }

  . = ALIGN(16);
  .data.cacheline_aligned : AT(ADDR(.data.cacheline_aligned) - 
LOAD_OFFSET ) {
    *(.data.cacheline_aligned)
  } :data

  _edata = .;            /* End of data section */

  . = ALIGN(8192);        /* Initrd */
  .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {
      __init_begin = .;
    _sinittext = .;
    *(.init.text)
    _einittext = .;
  }

  .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {
    *(.init.data)
  }

  . = ALIGN(16);
  .init.setup : AT(ADDR(.init.setup) - LOAD_OFFSET) {
    __setup_start = .;
    *(.init.setup)
      __setup_end = .;
  }

  .initcall.init : AT(ADDR(.initcall.init) - LOAD_OFFSET) {
    __initcall_start = .;
    INITCALLS
    __initcall_end = .;
  }

  .con_initcall.init : AT(ADDR(.con_initcall.init) - LOAD_OFFSET) {
    __con_initcall_start = .;
    *(.con_initcall.init)
    __con_initcall_end = .;
  }

  SECURITY_INIT

#ifdef CONFIG_BLK_DEV_INITRD
  . = ALIGN(8192);
  .init.ramfs : AT(ADDR(.init.ramfs) - LOAD_OFFSET) {
    __initramfs_start = .;
    *(.init.ramfs)
    __initramfs_end = .;
  }
#endif

  . = ALIGN(8192);
  __init_end = .;

  .data.init_task : AT(ADDR(.data.init_task) - LOAD_OFFSET) {
    *(.data.init_task)    /* The initial task and kernel stack */
  }

  _end = . ;

  /* Sections to be discarded */
  /DISCARD/ : {
    *(.exit.text)
    *(.exit.data)
    *(.exitcall.exit)
  }

  /* Stabs debugging sections.  */
  STABS_DEBUG
}

Trying to link .tmp_vmlinux1, I get

LD      .tmp_vmlinux1
m68k-linux-gnu-ld: .tmp_vmlinux1: PROGBITS section 
'.data.cacheline_aligned' cannot be placed into same segment after 
NOBITS section '.bss'
m68k-linux-gnu-ld: map sections to segments failed: Nonrepresentable 
section on output

With the older Linker (Sourcery G++ Lite 4.2-35) 2.17, there is no problem.

I try to allocate the data.cacheline_aligned bevore the .bss section, I 
get some overlapping errors:


...
  . = ALIGN(8192);
  .data : AT(ADDR(.data) - LOAD_OFFSET) {    /* Data */
    DATA_DATA
    CONSTRUCTORS   
  } :data

. = ALIGN(16);
  .data.cacheline_aligned : AT(ADDR(.data.cacheline_aligned) - 
LOAD_OFFSET ) {
    *(.data.cacheline_aligned)
  } :data

  .bss : AT(ADDR(.bss) - LOAD_OFFSET) {        /* BSS */
    *(.bss)
  }
...


LD      .tmp_vmlinux1
m68k-linux-gnu-ld: .tmp_vmlinux1: section .data lma 0xc0290000 overlaps 
previous sections
m68k-linux-gnu-ld: .tmp_vmlinux1: section .data.cacheline_aligned lma 
0xc02a4a50 overlaps previous sections
m68k-linux-gnu-ld: .tmp_vmlinux1: section .bss lma 0xc02a4af0 overlaps 
previous sections
m68k-linux-gnu-ld: .tmp_vmlinux1: section .init.text lma 0xc02da000 
overlaps previous sections
m68k-linux-gnu-ld: .tmp_vmlinux1: section .init.data lma 0xc02eb304 
overlaps previous sections
m68k-linux-gnu-ld: .tmp_vmlinux1: section .init.setup lma 0xc02ed110 
overlaps previous sections
m68k-linux-gnu-ld: .tmp_vmlinux1: section .initcall.init lma 0xc02ed350 
overlaps previous sections
m68k-linux-gnu-ld: .tmp_vmlinux1: section .con_initcall.init lma 
0xc02ed590 overlaps previous sections
m68k-linux-gnu-ld: .tmp_vmlinux1: section .data.init_task lma 0xc02ee000 
overlaps previous sections
m68k-linux-gnu-ld: .tmp_vmlinux1: section `.data' can't be allocated in 
segment 2
LOAD: .note.gnu.build-id .data .data.cacheline_aligned .bss .init.text 
.init.data .init.setup .initcall.init .con_initcall.init .data.init_task
m68k-linux-gnu-ld: final link failed: Bad value

Do you know a workaround?

Best regards,

Markus Königshaus
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