How to signed Android images

[llliu]

I have readed the user guide:https://www.nxp.com/docs/en/application-note/AN4581.pdf

But my operation system is android 7.1.2.I use "fastboot flash" command to load u-boot ,boot,and system images.I don't  konw how to signed my images .Can you give me a user guide?Thank you.

[joanxie]

refer to the document:

1)Uncomment " #define CONFIG_SECURE_BOOT

2)The command to sign u-boot

        $ ../linux64/cst -o csf_u-boot.bin < csf_u-boot.txt

        $ cat u-boot.imx csf_u-boot.bin > u-boot-signed.bin

        $ objcopy -I binary -O binary --pad-to 0x5d000 --gap-fill=0xff u-boot-signed.bin u-boot-signed-pad.bin

this is example for imx6ul, for more detailed information to get csf, you need to submit a ticket on salsefore.