sbrk.c: undefined reference to `end' in nrf connect SDK v2.4.0

RE: sbrk.c: undefined reference to `end' in nrf connect SDK v2.4.0

Vidar Berg — Tue, 01 Aug 2023 12:04:03 GMT

The new TF-M version included in SDK 2.4.0 does not allocate heap by default when you are doing a non-debug build. As a result, any implementations trying to use the C library heap will encounter a linker error, as you have experienced.

RE: sbrk.c: undefined reference to `end' in nrf connect SDK v2.4.0

Galaxo — Tue, 01 Aug 2023 07:19:04 GMT

Hi,

1) We have 2 Apps(One is without UART and another is with UART). we are using CONFIG_TFM_LOG_LEVEL_SILENCE=y only in UART app.
As per below ticket, if we remove CONFIG_TFM_LOG_LEVEL_SILENCE=y, we used to get undefined reference errors till v2.3.0 as we are using uart1(the same is used by TFM).Now with v2.4.0 UART app is compiling even without this config.

nonsecure app with uart support

2) Regarding "undefined reference to `end' " -- We debugged each line. This error is caused by 3 functions in our code i.e localtime, snprintf, vsnprintf (printf working fine). so we replaced these 3 APIs with custom implementation. Now it got compiled.

Issue is fixed for us. May be could you plz check why these 3 apis giving this error even if we don't use CONFIG_TFM_LOG_LEVEL_SILENCE=y

RE: sbrk.c: undefined reference to `end' in nrf connect SDK v2.4.0

Vidar Berg — Thu, 27 Jul 2023 13:23:49 GMT

Since you have CONFIG_TFM_LOG_LEVEL_SILENCE enabled, the printf implementation in TF-M will not be included. Instead, you will get the printf function from the C standard library, which requires heap. Do you get the same error if you remove CONFIG_TFM_LOG_LEVEL_SILENCE=y?

RE: sbrk.c: undefined reference to `end' in nrf connect SDK v2.4.0

Galaxo — Wed, 26 Jul 2023 13:04:17 GMT

Hello Vidar, Yes deleted. I thought to try more from my side, so.
It's on the v2.4.0 tag

user@WIN MINGW64 /c/ncs/v2.4.0/nrfxlib ((v2.4.0))
$ git status && git describe --tags
HEAD detached at refs/heads/manifest-rev
nothing to commit, working tree clean
v2.4.0

After digging into the problem we found that, this error is occuring in 2 cases.

1) when we are using variable argument list functions like va_start, va_end (we are using these for logging). When I disabled this log module, error got resolved.

2) when we are using UART related code. We are using UART to communicate between nrf5340 device and windows PC.

In prj.conf, we are using

CONFIG_UART_INTERRUPT_DRIVEN=y
CONFIG_TFM_LOG_LEVEL_SILENCE=y

In app code,

const struct device *uart1 = DEVICE_DT_GET(DT_NODELABEL(uart1));

Could you plz suggest some solution for this?

RE: sbrk.c: undefined reference to `end' in nrf connect SDK v2.4.0

Vidar Berg — Wed, 26 Jul 2023 12:16:48 GMT

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RE: sbrk.c: undefined reference to `end' in nrf connect SDK v2.4.0

Vidar Berg — Mon, 24 Jul 2023 09:04:18 GMT

Hello,

The developer I talked to suspects this is related to the cc3xx library. Please open the ncs/v2.4.0/ directory in a terminal and run "$ git status && git describe --tags" to verify that the 'nrfxlib' repo which contains this libary is on the v2.4.0 tag.

Thanks,

Vidar