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Linux/DRA75P: Android: J6EVM5777: How to enter recovery from the uboot？

Jacky Andrew Ou
Prodigy 100 points
Part Number: DRA75P

Tool/software:Android->u-boot->recovery

Hi，TI.The board I used is j6evm5777 board,and cpu is dra752-GP.Besides,the code source is 6ao1.1.

I want to enter the recovery mode from the u-boot,and I find that changing the bootenv variate reboot_img to  "recovery" can enter to the recovery mode from the website processors.wiki.ti.com/.../6AO.1.1_Application_Notes.And I do it.At the first time to get into the uboot,I input the printenv to check the bootenv ,the reboot_img variate is boot.

So I change it by inputting the command "setenv reboot_img recovery;saveenv;",and reboot by the power.I can't enter the recovery mode too.And I check that the reboot_img variate is recovery.

So I have the confuse about it .Plz help me to solve it.Thank you!