IMX6ULL NAND_WP pin is always high and cannot output low level

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IMX6ULL NAND_WP pin is always high and cannot output low level

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jackjiang
Contributor II

Dears,

During the pressure test of the customer's product, the data stored by NANDflash will sometimes be lost. After the test, it is found that the pin of "WP#" connected to the NANDflash chip of i.x6ull is always in a high level state.
Attached is the Flash datasheet and DTS for use on the board.

How to control "WP#" pin of IMX6ULL output low level to write protection of NANDflash chip?
客户产品软件压力测试时,遇到一些概率性NANDflash数据“临时性丢失”的问题。经排查,发现I.MX6ULL芯片连接NANDflash芯片的“WP#”管脚一直处于高电平状态(“WP#”为写保护管脚,低电平使能),无论是上电复位还是系统启动始终为高,理论上理解如果不对NANDflash芯片进行“写操作”,该管脚应该处于“低电平”状态才对,附件是板子上使用的flash手册

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igorpadykov
NXP TechSupport
NXP TechSupport

Hi Jack

one can tweak nand gpmi driver, look for /* Disable Write-Protection. */ in :

gpmi-nand.c\gpmi-nand\raw\nand\mtd\drivers - linux-imx - i.MX Linux kernel 

Best regards
igor
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