SLM SDK Ver 2.7.0 doesn't work without external flash?

[shibuta]

Hi,

I have been debugging with Serial LTE Modem(SLM) without an external flash .

I made the circuit of nRF9160 (SICA) without the external flash (MX25R6435F?) , I would like to work the latest version SLM without the external flash.

I wrote the fimware with the application version(XSLMVER:'2.7.0') , but the firmware of nRF9160 didn't say "Ready", it doesn't seem to work well.

But, the fimware with the application version(XSLMVER:'2.4.0') works well without the external flash.

On debugging this, I found that SLM seems to access the external flash because the signal from nRF9160 to the external flash confirmed.

Does the SLM require the external flash? I don't know why SLM doesn't work on XSLMVER:'2.7.0'

If possible, would you tell me why to need the external flash and how to fix(avoid the external flash).

Best regards.

[Hakon]

Hello,

can you check and upload the partitions.yml file for both the 2.4.0 and 2.7.0 version? Also zephyr.dts and .config for both cases.

[shibuta]

In other way to solve, I have tried writing the SLM firmware from board target named "thingy91/nrf9160/ns" ,  instead of board  "nrf9160dk/nrf9160/ns".

Fortunately, this SLM program of "thingy91/nrf9160/ns" has started with "Ready" and worked well.

I connected SLM to APN, and connected to my server, I put "POST" to the SLM, and SLM(server) replied "HTTP 1.1 200 OK".

But,  I found the "Ready" response from SLM just after above the response.

I know "thingy91/nrf9160/ns" is not  a genuine board target.

Do you know anything else about this? 

Best regards.