MT6761/MT6762/MT6765 How to trigger MRDUMP_KEY

长按power key 就可以触发dump，对于解决卡死类的问题有帮助

how to enable?

1、Please find out the platform dts file

example:kernel-4.9/arch/arm64/boot/mediatek/mt6761.dts

2、search for mrdump key word and you will see below text

  mrdump_ext_rst: mrdump_ext_rst {
compatible = "mediatek, mrdump_ext_rst-eint";（注意mediatek, mrdump_ext_rst-eint中逗号之后有个空格）
source = "EINT";
mode = "IRQ";
status = "okay";
};
Change as below, saved and rebuild bootimage

mrdump_ext_rst: mrdump_ext_rst {
compatible = "mediatek, mrdump_ext_rst-eint";
source = "SYSRST";
mode = "IRQ";
status = "okay";
};

3、How to trigger MRDUMP_KEY

Please long press power key(you may use power + volumn up , but need another patch) for around 9 seconds

Please do have a watch on hand to confirm the time in seconds

Please do not press longer than 15 seconds , if press too long , external PMIC will recognize as battery lost and everything is lost

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