arm u-boot中的u-boot.lds分析

OUTPUT_FORMAT("elf32-littlearm", "elf32-littlearm", "elf32-littlearm")    // 输出格式：elf, 32位，小端模式
OUTPUT_ARCH(arm)    // arm结构
ENTRY(_start)       // 入口点定义为_star, 此入口定义在：arch/arm/cpu/arm926ejs/start.S
SECTION             // 段定义
{
	. = 0x00000000;

	. = ALIGN(4);
	.text :
	{
		arch/arm/cpu/arm926ejs/start.o	(.text)
		*(.text)
	}

	. = ALIGN(4);
	.rodata : { *(SORT_BY_ALIGNMENT(SORT_BY_NAME(.rodata*))) }

	. = ALIGN(4);
	.data : {
		*(.data)
	}

	. = ALIGN(4);

	. = .;
	__u_boot_cmd_start = .;
	.u_boot_cmd : { *(.u_boot_cmd) }
	__u_boot_cmd_end = .;

	. = ALIGN(4);

	.rel.dyn : {
		__rel_dyn_start = .;
		*(.rel*)
		__rel_dyn_end = .;
	}

	.dynsym : {
		__dynsym_start = .;
		*(.dynsym)
	}

	_end = .;

	.bss __rel_dyn_start (OVERLAY) : {   // 定义bss段
		__bss_start = .;
		*(.bss)
		 . = ALIGN(4);
		__bss_end__ = .;
	}

	/DISCARD/ : { *(.dynstr*) }
	/DISCARD/ : { *(.dynamic*) }
	/DISCARD/ : { *(.plt*) }
	/DISCARD/ : { *(.interp*) }
	/DISCARD/ : { *(.gnu*) }
}