How to reduce the code size of TF-M

RE: How to reduce the code size of TF-M

Håkon Alseth — Thu, 06 Jul 2023 14:29:17 GMT

Happy to help out, glad to hear that it worked!

Kind regards,

Håkon

RE: How to reduce the code size of TF-M

Tide — Thu, 06 Jul 2023 13:19:18 GMT

Thanks, it worked and now TF-M only takes up 191KB!

flash_primary (0x100000 - 1024kB):
+--------------------------------------------------+
| 0x0: mcuboot (0xc000 - 48kB) |
| 0xc000: EMPTY_0 (0x4000 - 16kB) |
+---0x10000: mcuboot_primary (0x68000 - 416kB)-----+
+---0x10000: tfm_secure (0x30000 - 192kB)----------+
| 0x10000: mcuboot_pad (0x200 - 512B) |
+---0x10200: mcuboot_primary_app (0x67e00 - 415kB)-+
| 0x10200: tfm (0x2fe00 - 191kB) |
+---0x40000: tfm_nonsecure (0x38000 - 224kB)-------+
| 0x40000: app (0x38000 - 224kB) |
+--------------------------------------------------+
| 0x78000: mcuboot_secondary (0x68000 - 416kB) |
| 0xe0000: EMPTY_3 (0x8000 - 32kB) |
+---0xe8000: nonsecure_storage (0x6000 - 24kB)-----+
| 0xe8000: nvs_storage (0x6000 - 24kB) |
+--------------------------------------------------+
| 0xee000: EMPTY_2 (0x6000 - 24kB) |
+---0xf4000: tfm_storage (0x8000 - 32kB)-----------+
| 0xf4000: tfm_its (0x2000 - 8kB) |
| 0xf6000: tfm_otp_nv_counters (0x2000 - 8kB) |
| 0xf8000: tfm_ps (0x4000 - 16kB) |
+--------------------------------------------------+
| 0xfc000: EMPTY_1 (0x4000 - 16kB) |
+--------------------------------------------------+

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

sram_primary (0x40000 - 256kB):
+--------------------------------------------------+
+---0x20000000: mcuboot_sram (0x16000 - 88kB)------+
+---0x20000000: sram_secure (0x16000 - 88kB)-------+
| 0x20000000: tfm_sram (0x16000 - 88kB) |
+---0x20016000: sram_nonsecure (0x2a000 - 168kB)---+
+---0x20016000: nrf_modem_lib_sram (0x7ce8 - 31kB)-+
| 0x20016000: nrf_modem_lib_ctrl (0x4e8 - 1kB) |
| 0x200164e8: nrf_modem_lib_tx (0x5800 - 22kB) |
| 0x2001bce8: nrf_modem_lib_rx (0x2000 - 8kB) |
+--------------------------------------------------+
| 0x2001dce8: sram_primary (0x22318 - 136kB) |
+--------------------------------------------------+

RE: How to reduce the code size of TF-M

Håkon Alseth — Thu, 06 Jul 2023 10:27:27 GMT

Could you try setting this instead?

CONFIG_PM_PARTITION_SIZE_TFM=0x2FE00

Remember to regenerate your build (ie. delete the build folder) after making such a change.

Kind regards,

Håkon

RE: How to reduce the code size of TF-M

Tide — Thu, 06 Jul 2023 10:09:06 GMT

Hi,
I set prj.conf::CONFIG_TFM_PROFILE_TYPE_MEDIUM=y, just like the example you shared above, but my TF-M code size did not decrease. This is the dynamic partition generation in my project:

flash_primary (0x100000 - 1024kB):
+--------------------------------------------------+
| 0x0: mcuboot (0xc000 - 48kB) |
| 0xc000: EMPTY_0 (0x4000 - 16kB) |
+---0x10000: mcuboot_primary (0x68000 - 416kB)-----+
+---0x10000: tfm_secure (0x40000 - 256kB)----------+
| 0x10000: mcuboot_pad (0x200 - 512B) |
+---0x10200: mcuboot_primary_app (0x67e00 - 415kB)-+
| 0x10200: tfm (0x3fe00 - 255kB) |
+---0x50000: tfm_nonsecure (0x28000 - 160kB)-------+
| 0x50000: app (0x28000 - 160kB) |
+--------------------------------------------------+
| 0x78000: mcuboot_secondary (0x68000 - 416kB) |
| 0xe0000: EMPTY_3 (0x8000 - 32kB) |
+---0xe8000: nonsecure_storage (0x6000 - 24kB)-----+
| 0xe8000: nvs_storage (0x6000 - 24kB) |
+--------------------------------------------------+
| 0xee000: EMPTY_2 (0x6000 - 24kB) |
+---0xf4000: tfm_storage (0x8000 - 32kB)-----------+
| 0xf4000: tfm_its (0x2000 - 8kB) |
| 0xf6000: tfm_otp_nv_counters (0x2000 - 8kB) |
| 0xf8000: tfm_ps (0x4000 - 16kB) |
+--------------------------------------------------+
| 0xfc000: EMPTY_1 (0x4000 - 16kB) |
+--------------------------------------------------+

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

RE: How to reduce the code size of TF-M

Tide — Wed, 05 Jul 2023 02:20:25 GMT

Thank you very much, I will test it and get back to you as soon as possible.

RE: How to reduce the code size of TF-M

Håkon Alseth — Tue, 04 Jul 2023 14:16:57 GMT

Hi,

I am sorry, but the task is still open internally.

We have been able to set a "medium" configuration, here based on the samples/tfm/tfm_hello_world/ with a manual operation to reduce the "tfm" partition from 0x40000 -> 0x30000:

devzone.nordicsemi.com/.../tfm_5F00_hello_5F00_world_5F00_medium_5F00_size_5F00_ncs240.zip

Please note the pm_static.yml file which statically defines the whole partition layout, as well as prj.conf::CONFIG_TFM_PROFILE_TYPE_MEDIUM=y.

Could you try this and see if this helps with the flash usage at your end as well?

Kind regards,

Håkon

RE: How to reduce the code size of TF-M

Tide — Tue, 04 Jul 2023 11:53:28 GMT

Hi,
Is there any progress on this issue? We urgently need tf-m that can reduce the code size.

RE: How to reduce the code size of TF-M

Tide — Mon, 26 Jun 2023 06:45:56 GMT

Hi,

For this issue, please sync any progress on your end to this ticket and look forward to your progress.

RE: How to reduce the code size of TF-M

Tide — Wed, 21 Jun 2023 01:39:41 GMT

Thank you for your reply and I look forward to more exciting results from you.

RE: How to reduce the code size of TF-M

Håkon Alseth — Tue, 20 Jun 2023 14:10:05 GMT

Hi,

Unfortunately, it is not trivial to configure one specific cipher support only with TFM at this time. I've tried to get it slimmed down, but ended up hitting several issues wrt. missing settings in mbedtls.

I have created an internal jira ticket to improve this configuration setting.

Kind regards,

Håkon