Day1: 正原电子mini-linux 开发板开机测试

参考文档

01【正点原子】I.MX6U用户快速体验V2.6.pdf

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硬件原理图：
02、开发板原理图/IMX6ULL_MINI_V1.7(Mini底板原理图).pdf

测试

debug 串口

见底板原理图，
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需要安装驱动，“03、软件\CH340驱动(USB串口驱动)_XP_WIN7共用”

固化系统

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参见，“01【正点原子】I.MX6U用户快速体验V2.6.pdf”
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对于方案2.2.2.2，分为如下两个步骤

通过SD卡启动linux (此步也可以通过uboot下，ftp的方式下载image，启动Linux)
通过shell,使用脚本 imx6mkemmcboot.sh 烧写emmc

脚本参见
https://atk-imx6ull.coding.net/public/imx6ull/05_Tools/git/files/master/04%E3%80%81%E6%AD%A3%E7%82%B9%E5%8E%9F%E5%AD%90MFG_TOOL%E5%87%BA%E5%8E%82%E5%9B%BA%E4%BB%B6%E7%83%A7%E5%BD%95%E5%B7%A5%E5%85%B7/mfgtool/Profiles/Linux/OS%20Firmware/files/imx6mksdboot.sh

执行格式化
execute "dd if=/dev/zero of=$device bs=1024 count=1024"
分区
fdisk -H 255 -S 63 $device
格式化分区文件系统格式
mkfs.vfat -F 32 -n "boot" ${PARTITION1}
mkfs.ext3 -F -L "rootfs" ${PARTITION2}
烧写uboot
echo "正在烧写${Uboot}到${device}"
execute "dd if=$sdkdir/boot/$Uboot of=$device bs=1024 seek=1 conv=fsync"
复制设备树和内核
- 挂载“设备树和内核镜像”分区
- 复制.dtb和zImage文件到分区

execute "mount ${device}1 /tmp/sdk/$$"
execute "cp -r $sdkdir/boot/*${flash}*.dtb /tmp/sdk/$$/"
execute "cp -r $sdkdir/boot/zImage /tmp/sdk/$$/"

解压文件系统到文件系统分区
- 挂载文件系统分区
- 解压文件系统到分区

#挂载文件系统分区
execute "mount ${device}2 /tmp/sdk/$$"
#解压文件系统到文件系统分区
rootfs=`ls -1 filesystem/*.tar.*`
execute "tar jxfm $rootfs -C /tmp/sdk/$$"

电路板硬件功能测试

查看 CPU 主频

root@ATK-IMX6U:~# cpufreq-info
cpufrequtils 008: cpufreq-info (C) Dominik Brodowski 2004-2009
Report errors and bugs to cpufreq@vger.kernel.org, please.
analyzing CPU 0:
  driver: imx6q-cpufreq
  CPUs which run at the same hardware frequency: 0
  CPUs which need to have their frequency coordinated by software: 0
  maximum transition latency: 91.0 us.
  hardware limits: 198 MHz - 792 MHz
  available frequency steps: 198 MHz, 396 MHz, 528 MHz, 792 MHz
  available cpufreq governors: interactive, conservative, userspace, powersave, performance
  current policy: frequency should be within 198 MHz and 792 MHz.
                  The governor "performance" may decide which speed to use
                  within this range.
  current CPU frequency is 792 MHz (asserted by call to hardware).
  cpufreq stats: 198 MHz:0.00%, 396 MHz:0.00%, 528 MHz:0.00%, 792 MHz:100.00%  (1)
root@ATK-IMX6U:~#

LED

echo none > /sys/class/leds/sys-led/trigger // 改变 LED 的触发模式
echo 1 > /sys/class/leds/sys-led/brightness // 点亮 LED
echo 0 > /sys/class/leds/sys-led/brightness // 熄灭 LED