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。
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" exit 0fiif [ -b $1 ]then echo "$1 reader is identified."else echo "$1 is NOT identified." exit 0fi##################################### 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 1fi if [ ${BDEV_SIZE} -gt 32000000 ]; then echo "Error: Block device size (${BDEV_SIZE}) is too large" exit 1fi##################################### check files##################################### fusing imagessigned_bl1_position=1bl2_position=17uboot_position=49tzsw_position=705# echo "---------------------------------------"echo "BL1 fusing"dd iflag=dsync oflag=dsync if=./E4412_N.bl1.bin of=$1 seek=$signed_bl1_position# echo "---------------------------------------"echo "tiny4412-spl.bin fusing"dd iflag=dsync oflag=dsync if=./tiny4412-spl.bin of=$1 seek=$bl2_position # #echo "---------------------------------------"#echo "u-boot fusing"#dd iflag=dsync oflag=dsync if=E4412UBOOTof=1 seek=$uboot_position# #echo "---------------------------------------"#echo "TrustZone S/W fusing"#dd iflag=dsync oflag=dsync if=./E4412_tzsw.bin of=1seek=tzsw_position# sync##################################### 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。