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arm-none-eabi-gcc -s code.c -fdata-sections -ffunction-sections

void layout_test()
    {
     struct dram_para_t para = {
    .read_delays = 0x00007979,
    .write_delays = 0x6aaa0000,
    .dual_rank = 0,
    .bus_width = 32,
    .row_bits = 15,
    .bank_bits = 3,
   .page_size = 4096,                                                                                         
};

  }

	.cpu arm7tdmi
	.arch armv4t
	.fpu softvfp
	.eabi_attribute 20, 1
	.eabi_attribute 21, 1
	.eabi_attribute 23, 3
	.eabi_attribute 24, 1
	.eabi_attribute 25, 1
	.eabi_attribute 26, 1
	.eabi_attribute 30, 6
	.eabi_attribute 34, 0
	.eabi_attribute 18, 4
	.file	"main.c"
	.text
	.section	.rodata
	.align	2
.LC0:
	.word	31097
	.word	1789526016
	.short	4096
	.byte	32
	.byte	0
	.byte	15
	.byte	3
	.space	2
	.section	.text.layout_test,"ax",%progbits
	.align	2
	.global	layout_test
	.syntax unified
	.arm
	.type	layout_test, %function
layout_test:
	@ Function supports interworking.
	@ args = 0, pretend = 0, frame = 16
	@ frame_needed = 1, uses_anonymous_args = 0
	@ link register save eliminated.
	str	fp, [sp, #-4]!
	add	fp, sp, #0
	sub	sp, sp, #20
	ldr	r3, .L2
	sub	ip, fp, #20
	ldm	r3, {r0, r1, r2, r3}
	stm	ip, {r0, r1, r2, r3}
	nop
	add	sp, fp, #0
	@ sp needed
	ldr	fp, [sp], #4
	bx	lr
.L3:
	.align	2
.L2:
	.word	.LC0
	.size	layout_test, .-layout_test
	.ident	"GCC: (GNU Arm Embedded Toolchain 10.3-2021.10) 10.3.1 20210824 (release)"

void layout_test()
    {
     struct dram_para_t para = {
    .read_delays = 0x00007979,
    .write_delays = 0x6aaa0000,
    .dual_rank = 0,
    .bus_width = 32,
    .row_bits = 15,
    .bank_bits = 3,
  // .page_size = 4096,                                                                                         
};
//声明后赋值
para.page_size=4096;

  }

	.cpu arm7tdmi
	.arch armv4t
	.fpu softvfp
	.eabi_attribute 20, 1
	.eabi_attribute 21, 1
	.eabi_attribute 23, 3
	.eabi_attribute 24, 1
	.eabi_attribute 25, 1
	.eabi_attribute 26, 1
	.eabi_attribute 30, 6
	.eabi_attribute 34, 0
	.eabi_attribute 18, 4
	.file	"main.c"
	.text
	.section	.text.layout_test,"ax",%progbits
	.align	2
	.global	layout_test
	.syntax unified
	.arm
	.type	layout_test, %function
layout_test:
	@ Function supports interworking.
	@ args = 0, pretend = 0, frame = 16
	@ frame_needed = 1, uses_anonymous_args = 0
	@ link register save eliminated.
	str	fp, [sp, #-4]!
	add	fp, sp, #0
	sub	sp, sp, #20
	sub	r3, fp, #20
	mov	r2, #0
	str	r2, [r3]
	str	r2, [r3, #4]
	str	r2, [r3, #8]
	str	r2, [r3, #12]
	ldr	r3, .L2
	str	r3, [fp, #-20]
	ldr	r3, .L2+4
	str	r3, [fp, #-16]
	mov	r3, #32
	strb	r3, [fp, #-10]
	mov	r3, #15
	strb	r3, [fp, #-8]
	mov	r3, #3
	strb	r3, [fp, #-7]
	mov	r3, #4096
	strh	r3, [fp, #-12]	@ movhi
	nop
	add	sp, fp, #0
	@ sp needed
	ldr	fp, [sp], #4
	bx	lr
.L3:
	.align	2
.L2:
	.word	31097
	.word	1789526016
	.size	layout_test, .-layout_test
	.ident	"GCC: (GNU Arm Embedded Toolchain 10.3-2021.10) 10.3.1 20210824 (release)"