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awboot-fel.elf:     file format elf32-littlearm


Disassembly of section .text:

00038000 <__spl_start>:
   38000:	ea000016 	b	38060 <__spl_start+0x60>
   38004:	4e4f4765 	cdpmi	7, 4, cr4, cr15, cr5, {3}
   38008:	3054422e 	subscc	r4, r4, lr, lsr #4
   3800c:	12345678 	eorsne	r5, r4, #120, 12	; 0x7800000
   38010:	0000950c 	andeq	r9, r0, ip, lsl #10
   38014:	00000030 	andeq	r0, r0, r0, lsr r0
   38018:	30303033 	eorscc	r3, r0, r3, lsr r0
.............................
        char *str0 = "qwertyuio";
	send_string_via_usart((int)str0);
   38b3a:	486d      	ldr	r0, [pc, #436]	; (38cf0 <main+0x200>)
   38b3c:	f000 f92c 	bl	38d98 <send_string_via_usart>
.............................
   38cf0:	0003f88d 	andeq	pc, r3, sp, lsl #17
.............................
0003f88d <.rodata.main.str1.1>:

   3f88d:	72657771 	rsbvc	r7, r5, #29622272	; 0x1c40000
   3f891:	69757974 	ldmdbvs	r5!, {r2, r4, r5, r6, r8, fp, ip, sp, lr}^
.............................
void send_string_via_usart(int a) {
   38d98:	b570      	push	{r4, r5, r6, lr}

	int tmp = a+0x18000;
   38d9a:	f500 34c0 	add.w	r4, r0, #98304	; 0x18000
	char* str = (char*)tmp;
	putint((int)str);
	for(int i = 0;i<100;i++){
		if(str[i] == '\0')break;
		sunxi_usart_putc(&USART_DBG,str[i]);
   38d9e:	4e07      	ldr	r6, [pc, #28]	; (38dbc <send_string_via_usart+0x24>)
	putint((int)str);
   38da0:	4620      	mov	r0, r4
   38da2:	f104 0564 	add.w	r5, r4, #100	; 0x64
   38da6:	f7ff ffcd 	bl	38d44 <putint>
		if(str[i] == '\0')break;
   38daa:	7821      	ldrb	r1, [r4, #0]
   38dac:	b129      	cbz	r1, 38dba <send_string_via_usart+0x22>
		sunxi_usart_putc(&USART_DBG,str[i]);
   38dae:	4630      	mov	r0, r6
	for(int i = 0;i<100;i++){
   38db0:	3401      	adds	r4, #1
		sunxi_usart_putc(&USART_DBG,str[i]);
   38db2:	f001 fadb 	bl	3a36c <sunxi_usart_putc>
	for(int i = 0;i<100;i++){
   38db6:	42ac      	cmp	r4, r5
   38db8:	d1f7      	bne.n	38daa <send_string_via_usart+0x12>
	}
}
   38dba:	bd70      	pop	{r4, r5, r6, pc}
   38dbc:	0003f588 	andeq	pc, r3, r8, lsl #11
.........................
0003a36c <sunxi_usart_putc>:
		//uint32_t usart_base = usart->base;
		uint32_t usart_base = 0x02501400;

    // 等待发送缓冲区准备好
    do {
        __asm__ volatile (
   3a36c:	4b06      	ldr	r3, [pc, #24]	; (3a388 <sunxi_usart_putc+0x1c>)
   3a36e:	6fda      	ldr	r2, [r3, #124]	; 0x7c
   3a370:	f012 0f02 	tst.w	r2, #2
            "ldr %[status], [%[base], #0x7C] \n"  // 读取状态寄存器 (偏移 0x7C)
            "tst %[status], #(1 << 1) \n"         // 检查第 1 位 (发送缓冲区是否空)
            : [status] "=r" (status)              // 输出
            : [base] "r" (usart_base)             // 输入
        );
    } while ((status & (1 << 1)) == 0);
   3a374:	0790      	lsls	r0, r2, #30
   3a376:	d5fa      	bpl.n	3a36e <sunxi_usart_putc+0x2>

    // 发送字符
    __asm__ volatile (
   3a378:	6019      	str	r1, [r3, #0]
        : [ch] "r" ((uint32_t)c), [base] "r" (usart_base)
    );

    // 等待发送完成
    do {
        __asm__ volatile (
   3a37a:	6fda      	ldr	r2, [r3, #124]	; 0x7c
   3a37c:	f012 0f01 	tst.w	r2, #1
            "ldr %[status], [%[base], #0x7C] \n"  // 读取状态寄存器 (偏移 0x7C)
            "tst %[status], #(1 << 0) \n"         // 检查第 0 位 (发送是否完成)
            : [status] "=r" (status)              // 输出
            : [base] "r" (usart_base)             // 输入
        );
    } while ((status & (1 << 0)) != 0);
   3a380:	07d2      	lsls	r2, r2, #31
   3a382:	d4fa      	bmi.n	3a37a <sunxi_usart_putc+0xe>
}
   3a384:	4770      	bx	lr
   3a386:	bf00      	nop
   3a388:	02501400 	subseq	r1, r0, #0, 8

/**
 * \file
 *
 * \brief Linker script for T113-S3 internal SRAM
 *
 * based on: Linker script for running in internal FLASH on the SAMD21G17D
 * Copyright (c) 2018 Microchip Technology Inc.
 *
 * \asf_license_start
 *
 * \page License
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License.
 * You may obtain a copy of the Licence at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an AS IS BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * \asf_license_stop
 *
 */

/* This file gets parsed by the preprocessor */

OUTPUT_FORMAT("elf32-littlearm", "elf32-littlearm", "elf32-littlearm")
OUTPUT_ARCH(arm)
SEARCH_DIR(.)

/* Memory Spaces Definitions */
MEMORY
{
  ram   (rwx) : ORIGIN = __RAM_BASE, LENGTH = 96K /* A1 + DSP0 IRAM + DSP0 DRAM0. 128K on boot mode, 96K on FEL mode */
}

/* The stack size used by the application. NOTE: you need to adjust according to your application. */
STACK_SIZE = 0x1000; /* 4KB */

ENTRY(reset)

/* Section Definitions */
SECTIONS
{

    .text :
    {
    . = ALIGN(4);
    PROVIDE(__spl_start = .);
    *(.text .text.*)
    . = ALIGN(4);
    } > ram

    . = ALIGN(4);

    .ARM.exidx : {
        __exidx_start = .;
        *(.ARM.exidx* .gnu.linkonce.armexidx.*)
        __exidx_end = .;
    } > ram

    PROVIDE(__spl_end = .);
    PROVIDE(__spl_size = __spl_end - __spl_start);

    /* .bss section which is used for uninitialized data */
    .bss (NOLOAD) :
    {
        . = ALIGN(4);
        _sbss = . ;
        *(.bss .bss.*)
        *(COMMON)
        . = ALIGN(4);
        _ebss = . ;
    } > ram

    .stack (NOLOAD):
    {
        . = ALIGN(8);
    /* SRV stack section */
        __stack_srv_start = .;
        . += STACK_SIZE;
        __stack_srv_end = .;
    } > ram

    . = ALIGN(4);
    _end = . ;
}

U-Boot SPL 2019.04-00743-g7d99406 (Apr 26 2019 - 02:24:09 -0400)
DRAM: 64 MiB
Trying to boot from FEL


U-Boot 2019.04-00743-g7d99406 (Apr 26 2019 - 02:24:09 -0400) Allwinner Technology

CPU:   Allwinner V3s (SUN8I 1681)
Model: Lichee Pi Zero
DRAM:  64 MiB
MMC:   mmc@01c0f000: 0
Loading Environment from FAT... Card did not respond to voltage select!
In:    serial@01c28000
Out:   serial@01c28000
Err:   serial@01c28000
Net:   No ethernet found.
starting USB...
No working controllers found
Hit any key to stop autoboot:  0
(FEL boot)
## Executing script at 41900000
## Loading init Ramdisk from Legacy Image at 41a00000 ...
   Image Name:   Root Filesystem
   Image Type:   ARM Linux RAMDisk Image (gzip compressed)
   Data Size:    16967436 Bytes = 16.2 MiB
   Load Address: 00000000
   Entry Point:  00000000
   Verifying Checksum ... OK
## Flattened Device Tree blob at 41800000
   Booting using the fdt blob at 0x41800000
   Loading Ramdisk to 41dd1000, end 42dff70c ... OK
   Loading Device Tree to 41dcb000, end 41dd0e4f ... OK

Starting kernel ...