RE: Increasing RAM for application in 9161

Håkon Alseth — Thu, 22 May 2025 14:25:45 GMT

Hi,

A typical layout for a nRF91-device is that you have (atleast) one secure and one non-secure RAM block:

  flash_primary (0x100000 - 1024kB): 
+-------------------------------------------+
+---0x0: tfm_secure (0x8000 - 32kB)---------+
| 0x0: tfm (0x8000 - 32kB)                  |
+---0x8000: tfm_nonsecure (0xf8000 - 992kB)-+
| 0x8000: app (0xf8000 - 992kB)             |
+-------------------------------------------+

  otp (0x2f4 - 756B): 
+------------------------------+
| 0xff8108: otp (0x2f4 - 756B) |
+------------------------------+

  sram_primary (0x40000 - 256kB): 
+--------------------------------------------------+
+---0x20000000: sram_secure (0x8000 - 32kB)--------+
| 0x20000000: tfm_sram (0x8000 - 32kB)             |
+---0x20008000: sram_nonsecure (0x38000 - 224kB)---+
+---0x20008000: nrf_modem_lib_sram (0x4568 - 17kB)-+
| 0x20008000: nrf_modem_lib_ctrl (0x4e8 - 1kB)     |
| 0x200084e8: nrf_modem_lib_tx (0x2080 - 8kB)      |
| 0x2000a568: nrf_modem_lib_rx (0x2000 - 8kB)      |
+--------------------------------------------------+
| 0x2000c568: sram_primary (0x33a98 - 206kB)       |
+--------------------------------------------------+

Here I just took the at_client as-is, and checked the overall partition layout.

The TFM-image is usually 32k, and the remainder is for the application space.

Could you share the full build output?

Kind regards,

Håkon