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？

[Amanda Hsieh]

Hi, 

Have a look at Partition Manager documentation. 

Regards,
Amanda

[helen]

Hi

Sorry,I still don't know what is the max size  for app in the ram and flash after I have looked the Partion Manager.Becuse of I do not know which region in the yml file is necessary，Besides app,the customer also need fota,that is all the customer need.

[Amanda Hsieh]

Hi, 

You can go into the build-folder and write "ninja partition_manager_report" to get the memory layout. That is easy for you to know the partitions.yml. 

1. Here's memory used by hello_world, where I go into the build-folder and write "ninja partition_manager_report":

  flash_primary (0x100000 - 1024kB):
+--------------------------------+
| 0x0: spm (0x10000 - 64kB)      |
| 0x10000: app (0xf0000 - 960kB) |
+--------------------------------+

  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)       |
+--------------------------------------------------+

Without mcuboot, the total size is 1024k for the application space.

2. The app is located in flash_primary.

3. That's spm configurations 

The partitions.yml provided seem generated by the hello_world without mcuboot. 

Please see the memory usuaged of hello_world + mcuboot in my previous reply. 

Amanda

[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