mini2440更换nandflash(QFP封装)

nand flash 损坏

手上有一块友善之臂的 mini2440&＃xff0c;这块板子还是别人给我的&＃xff0c;有些年头了。前两天用它来研究 JTAG 调试内核&＃xff0c;烧了两次系统后&＃xff0c;发现烧不进去了。
minitools 显示【操作过程中出现了错误】

串口显示

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Installing yaffs2-image failed
Warning: Last Data not read out
Warning: Last Data not read out
Warning: Last Data not read out
Warning: Last Data not read out
Warning: Last Data not read out
Warning: Last Data not read out
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这是由于 nand flash 出现了大量坏块&＃xff0c;导致系统烧不进去了。坏块太多没有好的办法&＃xff0c;那就换掉 flash。

购买

某宝上买了相同型号的 nand flash&＃xff1a;K9F2G08U0C

拆

上助焊膏&＃xff0c;旁边电容贴上隔热胶带进行保护

热风枪 370℃

加热一分钟就拆下来了

焊

先处理焊盘&＃xff0c;用吸锡带吸走多余的锡&＃xff0c;防止芯片摆放不平
加助焊剂&＃xff0c;引脚对齐&＃xff0c;热风枪 400℃&＃xff0c;均匀加热&＃xff0c;待锡差不多快融化时&＃xff0c;用镊子压一压芯片&＃xff0c;焊接完成

再用洗板水擦一下

烧录系统

Superboot-2440 V1.3a(20131213) by FriendlyARMBooting from NOR
Try to find SD card...... not found.
Hello USB Loop
USB Mode: Connected
Installing bootloader...
Installing bootloader succeed
Installing kernel...
Installing kernel succeed
Updating Linux Command Line...
Linux Command Line Saved
Installing yaffs2-image...
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Installing yaffs2-image succeed


有一块坏块&＃xff0c;不过不影响烧录&＃xff0c;最终烧录成功
重启后一块坏块也没有了

复活