[opentitan SW test ] The hello world ROM program

[houdonghui1]

Description

Hello Mr.engineer,I need your help. I encountered a problem while testing 'hello world'. https://opentitan.org/guides/getting_started/setup_fpga.html#manually-loading-fpga-bitstreams-and-bootstrapping-opentitan-software-with-opentitantool I attempted to import the test program into Opentitan's FLASH for execution When I run “bazel run //sw/host/opentitantool bootstrap $(ci/scripts/target-location.sh//sw/device/examples/hello_world:hello_world_fpga_cw310_bin)” Ubuntu display Error: SFDP header contains incorrect signature: 0xff00010a. What is the problem causing this? I went to the official website to search for the content of SFDP, and after thinking about it, I believe that there is a problem with the program in the ROM. The file I am currently using is "testrom_fga_cw310.39. scr. vmem" in my FPGA project. Does the ROM program not match the opentitna hardware? May I ask which ROM data initialization file is used in the "hello world" testing experiment for OpenTitan?

[fpgauser]

Hello @houdonghui1 , were you able to get your question resolved? I am in a similar situation. Since it wasn't possible to get a CW310 board, I used a Xilinx ZCU102 board connected with jumpers to a Arduino DUE board which contains a SAM3X chip. I am able to get test_rom to boot but am unable to SPI boot load the application. I get a similar SFDP header error. Logic analyzer shows active SPI and strap signals so I know the ARM is active and trying to do something. Any help appreciated. -John

[houdonghui1]

Hello @houdonghui1 , were you able to get your question resolved? I am in a similar situation. Since it wasn't possible to get a CW310 board, I used a Xilinx ZCU102 board connected with jumpers to a Arduino DUE board which contains a SAM3X chip. I am able to get test_rom to boot but am unable to SPI boot load the application. I get a similar SFDP header error. Logic analyzer shows active SPI and strap signals so I know the ARM is active and trying to do something. Any help appreciated. -John

Hello, I have designed a PCB containing SAM3X to supplement the gap between my board and CW310, and integrated it in the FPGA section according to the original timing constraints. In this way, I obtained the correct bitstream and guided the test examples correctly during testing.

[fpgauser]

Thanks for your reply!
Nice work.

Wondering what, if any, changes you made to the opentitan hw/sw? Or is it an exact replica?

Did you use the same vmem files you showed earlier? test_rom_fpga_cw310.39.scr.vmem img_rma.24.vmem

Also, did you modify the SAM3X ARM code or are you using the binary from the newae site?

I have some problem with the SPI bus between SAM3X and the FPGA. An SPI transaction is initiated by the SAM3X, but nothing comes back from the FPGA:

-John