how to control through jtag uart

Hello Jesse.

We are developing product using Cyclone and are investigating

writing FPGA image to EPCS through JTAG interface.

As you know it can be achived by nios2-flash-programmer

for this purpose.

But there are some Cyclone chips on our board, and we'd like to

write all EPCSs through only one JTAG interface.

(see below)

Host PC

|

JTAG

|

C1-----C2-----C3-----C4----- ...

| | | |

EPCS1 EPCS2 EPCS3 EPCS4

We have developed a functionality of receiving FPGA image

from UART and writing it from a Cyclone (C1) to EPCS which configures

the other Cyclone (C2, C3,,,) by using SPI.

Is there a way to send data through JTAG uart from my original

program on host PC?

If there is, writing procedure will be

1. configure C1 from JTAG by quartus_pgm.

(or write EPCS1 by nios2-flash-programmer)

2. boot C1.

3. software on C1 receives FPGA image from JTAG uart.

4. write it to EPCS2 by SPI.

:

Best regards.