tiny4412 --uboot移植(2) 点灯

开发环境：win10 64位 + VMware12 + Ubuntu14.04 32位

工具链：linaro提供的gcc-linaro-6.1.1-2016.08-x86_64_arm-linux-gnueabi

要移植的u-boot版本：u-boot-2016-11

Tiny4412开发板硬件版本为：

  底板：  Tiny4412SDK 1312B

  核心板：Tiny4412 - 1306

 

在上一节中我们为tiny4412开发板添加相应目录文件，并且可以顺利编译通过生成.bin文件。接下来我们通过点亮tiny4412核心板上的LED灯开始调试u-boot。

4412裸板开发 （1点灯）

代码，原理都与裸板相同，就不多做介绍。

1、直接将其添加进 arch/arm/cpu/armv7/start.S 

diff --git a/arch/arm/cpu/armv7/start.S b/arch/arm/cpu/armv7/start.S
index 7eee54b..387f2ac 100644
--- a/arch/arm/cpu/armv7/start.S
+++ b/arch/arm/cpu/armv7/start.S
@@ -60,7 +60,7 @@ switch_to_hypervisor_ret:
orrne r0, r0, #0x13 @ set SVC mode
orr r0, r0, #0xc0 @ disable FIQ and IRQ
msr cpsr,r0

/*
* Setup vector:
* (OMAP4 spl TEXT_BASE is not 32 byte aligned.
@@ -84,7 +84,7 @@ switch_to_hypervisor_ret:
bl cpu_init_crit
#endif
#endif

// bl_main 之前加，在cpu_init 之后
+ bl light_led
bl _main

/*-----------------------------------------------------------------------------
@@ -293,3 +293,13 @@ ENTRY(cpu_init_crit)
b lowlevel_init @ go setup pll,mux,memory
ENDPROC(cpu_init_crit)
#endif

//最后面加
+ .globl light_led
+light_led:
+ ldr r0,=0x110002E0
+ ldr r1,=0x00001111
+ str r1,[r0]
+
+ ldr r0,=0x110002E4
+ mov r1,#0xF0
+ str r1,[r0]
+ mov pc,lr

2、将sd_fuse 文件夹复制到根目录下，其中包括exynos4412启动所需的二进制固件：E4412_N.bl1.bin、E4412_tzsw.bin 、sd_fuse.c、fast_fuse.sh、sd_fusing.sh

只需要修改sd_fusing.sh 

#
# Copyright (C) 2011 Samsung Electronics Co., Ltd.
#              http://www.samsung.com/
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
####################################

if [ -z $1 ]
then
    echo "usage: ./sd_fusing.sh <SD Reader's device file>"
    exit 0
fi

if [ -b $1 ]
then
    echo "$1 reader is identified."
else
    echo "$1 is NOT identified."
    exit 0
fi
####################################

#<verify device>

BDEV_NAME=`basename $1`
BDEV_SIZE=`cat /sys/block/${BDEV_NAME}/size` 

if [ ${BDEV_SIZE} -le 0 ]; then
    echo "Error: NO media found in card reader."
    exit 1
fi

if [ ${BDEV_SIZE} -gt 32000000 ]; then
    echo "Error: Block device size (${BDEV_SIZE}) is too large"
    exit 1
fi

####################################

# check files


####################################

# fusing images

signed_bl1_position=1
bl2_position=17
uboot_position=49
tzsw_position=705

#<BL1 fusing>
echo "---------------------------------------"
echo "BL1 fusing"
dd iflag=dsync oflag=dsync if=./E4412_N.bl1.bin of=$1 seek=$signed_bl1_position

#<tiny4412-spl.bin fusing>
echo "---------------------------------------"
echo "tiny4412-spl.bin fusing"
dd iflag=dsync oflag=dsync if=./tiny4412-spl.bin of=$1 seek=$bl2_position

#<u-boot fusing>
#echo "---------------------------------------"
#echo "u-boot fusing"
#dd iflag=dsync oflag=dsync if=E4412UBOOTof=1 seek=$uboot_position

#<TrustZone S/W fusing>
#echo "---------------------------------------"
#echo "TrustZone S/W fusing"
#dd iflag=dsync oflag=dsync if=./E4412_tzsw.bin of=1seek=tzsw_position

#<flush to disk>

sync

####################################

#<Message Display>
echo "---------------------------------------"
echo "U-boot image is fused successfully."
echo "Eject SD card and insert it again."

 

3、u-boot根目录下添加编译脚本文件build-tiny4412.sh

  1 echo "****clean****"
  2 make clean
  3 
  4 echo "----config tiny4412----"
  5 make ARCH=arm tiny4412_defconfig
  6 
  7 echo "----building----"
  8 make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi-

在完成前两部后，在根目录执行build-tiny4412.sh ，正常会在spl下生成tiny4412-spl.bin。这就是通过board/samsung/tiny4412/tools/mktiny4412spl.h生成的bl2。然后把tiny4412-spl.bin拷入sd_fuse ，用sd_fusing.sh 烧入SD卡即可。