[硬件]重大利好，NAND信息读取不能者新的希望！恢复读取功能操作实测成功！

wangluoxi

为确保该方法的通用性，有童鞋实测成功的务必说一声！！ 也算是给别的童鞋更好的借鉴！
昨晚偶滴NAND信息读取测试平台又杯具了。无法进行读取，跟我上一个板子出现的样子一样：https://bbs.a9vg.com/viewthread.php?tid=1403002
因为这次用的是废板子，也不值钱，索性按照上一个帖子里提到方法试试运气，大不了烧掉NAND而已。
而这次冒险终于还是有效果滴！我的NAND信息又可以读取出来了。
具体方法为短接44-47脚，如下图：


短接方式我个人建议将其焊上，测试一下能够正确读取了再焊开，当然一直焊着是什么状况偶没有测试。
具体流程为：
1，焊接44-47.
2，给主板供电，只插电源，不开机！
3，读取NAND信息。
4，焊开短接的4个脚，完成。
这帖子我觉得很有意义，童鞋们不回帖就太对不起偶了。
忘记说了，毕竟此方法有可能造成芯片损坏，导致机器变砖，所以在操作前务必三思！.

mr.h

支持一下, 想问问这是什么原理.

wujifan

顶你 啦 ！！！！！！1

wangluoxi

转帖：
Bad flash to nand ? recovery!


If like me you are rushing around, and accidentally flash a xenon xell image to a zephyr or other board, then there are two things you'll notice
1) it won't power up dead as door nail.
2) the nandpro program won't recognise the flash chip any more so you can't write the correct image to the chip. OH DEAR!!!
There is help though by shorting a couple of pins on the nand.


This is what you nand looks like, you'll notice in the top left hand corner a dimple on the chip that is signifying pin 1.
This is a shortened chip with leg/pin numbers.
the objective is to prevent the SMC from retrieving its instruction code/firmware, by shorting and confusing the data lines.
I shorted pins 44-47 with a flat head screw driver (gash I know).
sequence of events,
I disconnected power brick,
shorted pins,
connected power brick,
un-shorted pins (removed screwdriver)
ran NandPro 2.0b. It now shows correct flashconfig again hooray!!
Pins 44-47 are I/O pins don't carry any voltage so to speak so chances or blowing something is less but not impossible so only do this if you are completely stuck and the alternative is to remove the chip bench program it.
Re-flashed with correct xell image booted linux flashed xbr all is fine now phew!!
Ted [/SIZE]

该用户已被禁言

好邪恶的诅咒啊.
文章长度错误(请控制在16-500000字节)

mr.h

谢谢分享~                .

kele5867

现在刷自制风险还是很高的嘛

onikage

焊上了搞不开了怎么办?

austin909

话说原理似乎没有明朗，不知道是否有通用性。
PS：末尾诅咒是恶毒的。。。。

lawyisheng

为了解除诅咒，回复一下啦