Re: [U-Boot-Users] Based on x86 build out u-boot image up to 1G!! Help!!

29 Aug 2006

      李皓
Try a variation of this.  I too have scars still from sc520... -;)
And feel free to ping me back offline about sc520.
...
Hi, all!
     I am trying to build u-boot on sc520_cdp board. I have read all 

missives about sc520_cdp board, but still can’t solve my problem on HUGE 
size of u-boot.bin. After reading Mr. Jon Loeliger’s missive about _Why 
objdump Creates 4G U-Boot Images_, I know how to check the reason of 
u-boot.bin’s size. But after reading u-boot.lds in board/sc520_cdp/, I 
feel that I cannot change the mapping addresses, such as TEXT_BASE= 
0x387c0000, and .bios 0 : AT ( LOADADDR(.realmode) + SIZEOF(.realmode) ) 
{ *(.bios) }.
     According to Mr. Jon Loeliger’s missive, text section’s 

address(0x387c0000) and .bios section’s address(around 0) result in the 
huge size of u-boot.bin. But I know because after start up computer it 
is realmode in x86, .bios section should be mapped to low address. So I 
feel in dilemma right now. What should I do? Guys out there who have 
built out u-boot.bin based on x86 successfully please help me! Detailed 
information will be nice.
David_leeh

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/*
 * (C) Copyright 2002
 * Daniel Engström, Omicron Ceti AB, daniel@omicron.se.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */
OUTPUT_FORMAT("elf32-i386", "elf32-i386", "elf32-i386")
OUTPUT_ARCH(i386)
ENTRY(_start)
SECTIONS
{
    /* here is where we are in flash: last 128k */
    . = 0x080e0000;
.text  : { *(.text); }
. = ALIGN(4);
    .rodata : { *(.rodata) *(.rodata.str1.1) *(.rodata.str1.32) }
/* define its reloation address as off in RAM at 1M below 64M line,  but use 
     * AT () to make its load address right here, after previous
     */
    . = 0x3f00000;
    _i386boot_romdata_dest = ABSOLUTE(.);
    .data : AT ( LOADADDR(.rodata) + SIZEOF(.rodata) ) { *(.data) }
    _i386boot_romdata_start = LOADADDR(.data);
__u_boot_cmd_start = .;
    .u_boot_cmd : AT ( LOADADDR (.data ) + SIZEOF (.data) ) { *(.u_boot_cmd) }
    __u_boot_cmd_end = .;
.got : AT ( LOADADDR(.u_boot_cmd) + SIZEOF(.u_boot_cmd) ) { *(.got) }
    _i386boot_romdata_size = SIZEOF(.data) + SIZEOF(.got) + SIZEOF (.u_boot_cmd);
. = ALIGN(4);
    _i386boot_bss_start = ABSOLUTE(.);
    .bss : { *(.bss) }
    _i386boot_bss_size = SIZEOF(.bss);
/* 16bit realmode trampoline code */
    .realmode 0x7c0 : AT ( LOADADDR(.got) + SIZEOF(.got) ) { *(.realmode) }
_i386boot_realmode = LOADADDR(.realmode);
    _i386boot_realmode_size = SIZEOF(.realmode);
/* 16bit BIOS emulation code (just enough to boot Linux) */
    .bios 0 : AT ( LOADADDR(.realmode) + SIZEOF(.realmode) ) { *(.bios) }
_i386boot_bios = LOADADDR(.bios);
    _i386boot_bios_size = SIZEOF(.bios);
/* The load addresses below assumes that the flash
     * will be mapped so that 0x80f0000 == 0xffff0000
     * at reset time
     *
     * The fe00 and ff00 offsets of the start32 and start16
     * segments are arbitrary, the just have to be mapped
     * at reset and the code have to fit.
     * The fff0 offset of reset is important, however.
     */
. = 0xfffffe00;
    .start32 : AT (0x080ffe00) { *(.start32); }
. = 0xff00;
    .start16 : AT (0x080fff00) { *(.start16); }
. = 0xfff0;
    .reset : AT (0x080ffff0) { *(.reset); }
    _i386boot_end = (LOADADDR(.reset) + SIZEOF(.reset) );
}

Re: [U-Boot-Users] Based on x86 build out u-boot image up to 1G!! Help!!

David Updegraff