Can't read OTP from AES encrypted program

[milo]

I've stored a serial number for my product in OTP. My program can read the serial number just fine using OTP_read() if I run it using JTAG and reading OTP with xburn shows it is there. However, if I boot from an encrypted AES image of my program stored in flash, otp_read() returns a value of 0 instead of the stored serial number. Is OTP off limits to programs that have been encrypted? I can't find anything in the documentation to explain this.

[andrewxcav]

https://www.xmos.com/documentation/XM-0 ... guard.html

I think the secure boot bit disables OTP read.