The max size of RAM and Flash for APP

[helen]

Hi 

       What is the max size of RAM and Flash for  APP?I looked in the partitions.yml of a sample，I found that there is many region for different use，I don't know which region is necessary and what is the max size of RAM and Flash for  APP?Could you tell me about this？

[helen]

Hi

Thank you for your reply patiently!

1、Is the 206kB in the figure below the space of app in the ram?How is the app space in the ram if it have mcuboot? 

2、

I typed "ninja partition_manager_report" on the git-cmd.cmd after I had changed the path to v1.7.0\zephyr\samples\hello_world on the git-cmd.cmd.but it logged error.I do not know how to use this way to get the partition report.

 

[Amanda Hsieh]

Hi, 

1. App and mcuboot would not use that space. See the memory layout of hello_world + mcuboot: 

  flash_primary (0x100000 - 1024kB):
+--------------------------------------------------+
| 0x0: mcuboot (0xc000 - 48kB)                     |
| 0xc000: EMPTY_0 (0x4000 - 16kB)                  |
+---0x10000: mcuboot_primary (0x78000 - 480kB)-----+
| 0x10000: mcuboot_pad (0x200 - 512B)              |
+---0x10200: mcuboot_primary_app (0x77e00 - 479kB)-+
| 0x10200: spm (0x10000 - 64kB)                    |
| 0x20200: app (0x67e00 - 415kB)                   |
+--------------------------------------------------+
| 0x88000: mcuboot_secondary (0x78000 - 480kB)     |
+--------------------------------------------------+

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

  sram_primary (0x40000 - 256kB):
+--------------------------------------------------+
+---0x20000000: sram_secure (0x8000 - 32kB)--------+
| 0x20000000: spm_sram (0x8000 - 32kB)             |
+---0x20008000: sram_nonsecure (0x38000 - 224kB)---+
+---0x20008000: nrf_modem_lib_sram (0x44e8 - 17kB)-+
| 0x20008000: nrf_modem_lib_ctrl (0x4e8 - 1kB)     |
| 0x200084e8: nrf_modem_lib_tx (0x2000 - 8kB)      |
| 0x2000a4e8: nrf_modem_lib_rx (0x2000 - 8kB)      |
+--------------------------------------------------+
| 0x2000c4e8: sram_primary (0x33b18 - 206kB)       |
+--------------------------------------------------+

2. That's for v1.9. For v1.7, you could use 

$ west build -p -b nrf9160dk_nrf9160_ns
$ west build -t rom_report // Ninja build target to display flash layout as shown below

-Amanda

[helen]

Hi 

Sorry，I still don‘t understand which space is for app in the ram from the memory layout you showed.Could you point out it？

[Amanda Hsieh]

Yes, you are right. They will use sram_primary. You also can run Build Target: ram_report to get the detailed RAM usage of the app. 

-Amanda