Jic file/EPCS safe remote update?

Hi,

I am developing a system with a Nios running on SRAM and booting from EPCS (epcs controller). I use a cyclone IV GX.

I have a serial link which allows receiving data from network. I would like to update the jic file in EPCS using this serial link (both hw and sw images). I understood that a non erasable factory image is needed to prevent a crash when writing a new image.

Maybe Altremote_update could be what I need but it is not well documented. I especially don’t understand:

- How the altremote IP manage remote files? Do I have to write the file by directly accessing the epcs with custom logic and then give the address to the altremote IP?

- Can I write directly a .jic file in EPCS?

- After configure/reconfigure the FPGA, does the altremote IP let other IP taking epcs control (nios epcs controller, user logic to write epcs…)?

- is there any example/AN which explain how using altremote_update ip (AN521 doesn’t go into details)?

Thanks for helping!