Solution to TL570x-EVM-A2 development board device node operation not permitted

bqgup

Solution to TL570x-EVM-A2 development board device node operation not permitted [Copy link]

 

# Solution to the device node operation not permitted on the TL570x-EVM-A2 development board##1. Problem description###When testing the fan control on the TL570x-EVM-A2 development board, follow the manual requirements as follows: <ignore_js_op> <img style="cursor:pointer;" id="aimg_527512" aid="527512" src="/bbs/static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="//bbs.eeworld.com.cn/data/attachment/forum/202103/10/172345hkn8kzlgslgkgkov.png" file="//bbs.eeworld.com.cn/data/attachment/forum/202103/10/172345hkn8kzlgslgkgkov.png" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_527512_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>1.png</strong> <em class="xg1">(190.86 KB, downloads: 0)</em></p> <p> <a href="javascript:;" class="loginf" >download attach</a> <a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_527512" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=527512&handlekey=savephoto_527512">save to album</a> </p> <p class="xg1 y">2021-3-10 17:23 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> ###When operating in the terminal, the following problem occurred: <ignore_js_op> <img style="cursor:pointer;" id="aimg_527513" aid="527513" src="/bbs/static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="//bbs.eeworld.com.cn/data/attachment/forum/202103/10/172514kqqueonp452qt2tv.png" file="//bbs.eeworld.com.cn/data/attachment/forum/202103/10/172514kqqueonp452qt2tv.png" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_527513_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>2.png</strong> <em class="xg1">(7.71 KB, downloads: 0)</em></p> <p> <a href="javascript:;" class="loginf" >download attach</a> <a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_527513" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=527513&handlekey=savephoto_527513">save to album</a> </p> <p class="xg1 y">2021-3-10 17:25 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> ###It was found that operation not permitted, and the motor operation could not be controlled at all. ##2. Solution###After trying the solutions given online, the problem still could not be solved, so the system startup card was remade, and then the system was fixed on the development board. For the Linux system startup card production and system fixation methods, refer to the manual provided by Chuanglong: ### <ignore_js_op> <img src="/bbs/static/image/filetype/pdf.gif" border="0" class="vm" alt="" /> <span style="white-space: nowrap" id="attach_527514" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})"> <a href="javascript:;" class="loginf">3-2-Linux系统启动卡制作及系统固化.pdf</a> <em class="xg1">(1.7 MB, downloads: 0)</em> </span> <div class="tip tip_4" id="attach_527514_menu" style="position: absolute; display: none" disautofocus="true"> <div class="tip_c xs0"> <div class="y">2021-3-10 17:30 上传</div> 点击文件名下载附件 </div> <div class="tip_horn"></div> </div> </ignore_js_op> ###Following the steps given in the manual, the Linux system startup card was successfully made <ignore_js_op> <img style="cursor:pointer;" id="aimg_527517" aid="527517" src="/bbs/static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="//bbs.eeworld.com.cn/data/attachment/forum/202103/10/173338et8t8b888fzt0jxw.png" file="//bbs.eeworld.com.cn/data/attachment/forum/202103/10/173338et8t8b888fzt0jxw.png" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_527517_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>3.png</strong> <em class="xg1">(64.08 KB, downloads: 0)</em></p> <p> <a href="javascript:;" class="loginf" >download attach</a> <a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_527517" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=527517&handlekey=savephoto_527517">save to album</a> </p> <p class="xg1 y">2021-3-10 17:33 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> ###Then open the development board system and control the motor through commands. It was found that it was OK and the problem was solved. <ignore_js_op> <img style="cursor:pointer;" id="aimg_527518" aid="527518" src="/bbs/static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="//bbs.eeworld.com.cn/data/attachment/forum/202103/10/173545z1zj662b642r16v8.png" file="//bbs.eeworld.com.cn/data/attachment/forum/202103/10/173545z1zj662b642r16v8.png" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_527518_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>4.png</strong> <em class="xg1">(5.81 KB, downloads: 0)</em></p> <p> <a href="javascript:;" class="loginf" >download attach</a> <a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_527518" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=527518&handlekey=savephoto_527518">save to album</a> </p> <p class="xg1 y">2021-3-10 17:35 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> ###The experimental results are as follows: <ignore_js_op> <img id="aimg_527521" style="cursor:pointer;" aid="527521" src="/bbs/static/image/common/none.gif" zoomfile="//bbs.eeworld.com.cn/data/attachment/forum/202103/10/174052xz2uamn9tmct992h.gif" file="//bbs.eeworld.com.cn/data/attachment/forum/202103/10/174052xz2uamn9tmct992h.gif" class="zoom" onclick="zoom(this, this.src, 0, 0, 0)" width="640" id="aimg_527521" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_527521_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>a.gif</strong> <em class="xg1">(3.19 MB, downloads: 0)</em></p> <p> <a href="javascript:;" class="loginf" >download attach</a> <a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_527521" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=527521&handlekey=savephoto_527521">save to album</a> </p> <p class="xg1 y">2021-3-10 17:40 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> <ignore_js_op> <img id="aimg_527522" style="cursor:pointer;" aid="527522" src="/bbs/static/image/common/none.gif" zoomfile="//bbs.eeworld.com.cn/data/attachment/forum/202103/10/174150gcsgmquqqpxpq9gm.gif" file="//bbs.eeworld.com.cn/data/attachment/forum/202103/10/174150gcsgmquqqpxpq9gm.gif" class="zoom" onclick="zoom(this, this.src, 0, 0, 0)" width="640" id="aimg_527522" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_527522_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>b.gif</strong> <em class="xg1">(2.08 MB, downloads: 0)</em></p> <p> <a href="javascript:;" class="loginf" >download attach</a> <a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_527522" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=527522&handlekey=savephoto_527522">save to album</a> </p> <p class="xg1 y">2021-3-10 17:41 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op>

okhxyyo

Thank you for sharing your valuable experience~~~

bqgup

The solution is equivalent to reinstalling the system after a computer problem. It is not a good solution, but it can be regarded as a way of thinking.

annysky2012

Thanks for sharing, very good

bqgup

Attached is the code that can be copied and pasted directly

echo 137 > /sys/class/gpio/export //生成风扇控制设备节点
echo 0 > /sys/class/gpio/gpio137/value //风扇停止
echo 1 > /sys/class/gpio/gpio137/value //风扇转动