XIP doc: Unable to relocate zephyr library to external Flash.

[Ckrty]

Hi zephyr,

Based on the extxip_smp_svr example, I tried to redirect the entire zephyr library to external flash memory,
like this "zephyr_code_relocate(LIBRARY zephyr LOCATION EXTFLASH_TEXT NOCOPY)",
But I ran into some compilation errors and the compilation log looks like this:

[655/666] Linking C static library zephyr\kernel\libkernel.a
[656/666] Generating code_relocation.c, include/generated/linker_relocate.ld
D:\ncs\noridc\v2.8.0\zephyr\scripts\build\gen_relocate_app.py:547: UserWarning: File: D:/fork/brand-board/build/brand-board/zephyr/include/generated/posix/strsignal_table.h.rule Not found
warnings.warn("File: "+file_glob+" Not found")
[657/666] Building C object zephyr/CMakeFiles/code_relocation_source_lib.dir/code_relocation.c.obj
[658/666] Linking C static library zephyr\libcode_relocation_source_lib.a
[659/666] Generating linker_zephyr_pre0.cmd
[660/666] Building C object zephyr/CMakeFiles/zephyr_pre0.dir/misc/empty_file.c.obj
[661/666] Linking C executable zephyr\zephyr_pre0.elf
FAILED: zephyr/zephyr_pre0.elf zephyr/zephyr_pre0.map D:/fork/brand-board/build/brand-board/zephyr/zephyr_pre0.map
cmd.exe /C "cd . && D:\ncs\noridc\toolchains\2d382dcd92\opt\zephyr-sdk\arm-zephyr-eabi\bin\arm-zephyr-eabi-gcc.exe -Os -DNDEBUG -gdwarf-4 @CMakeFiles\zephyr_pre0.rsp -o zephyr\zephyr_pre0.elf && cmd.exe /C "cd /D D:\fork\brand-board\build\brand-board\zephyr && D:\ncs\noridc\toolchains\2d382dcd92\opt\bin\cmake.exe -E true""
d:/ncs/noridc/toolchains/2d382dcd92/opt/zephyr-sdk/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld.bfd.exe: zephyr/libzephyr.a(hci_vs_sdc.c.obj): in function `hci_vs_cmd_with_rsp':
D:/ncs/noridc/v2.8.0/nrf/subsys/bluetooth/hci_vs_sdc.c:48: undefined reference to `bt_hci_cmd_create'
d:/ncs/noridc/toolchains/2d382dcd92/opt/zephyr-sdk/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld.bfd.exe: zephyr/libzephyr.a(hci_vs_sdc.c.obj): in function `hci_vs_cmd_no_rsp':
D:/ncs/noridc/v2.8.0/nrf/subsys/bluetooth/hci_vs_sdc.c:31: undefined reference to `bt_hci_cmd_create'
collect2.exe: error: ld returned 1 exit status
ninja: build stopped: subcommand failed.
[22/47] No configure step for 'b0n'
FAILED: _sysbuild/sysbuild/images/brand-board-prefix/src/brand-board-stamp/brand-board-build D:/fork/brand-board/build/_sysbuild/sysbuild/images/brand-board-prefix/src/brand-board-stamp/brand-board-build
cmd.exe /C "cd /D D:\fork\brand-board\build\brand-board && D:\ncs\noridc\toolchains\2d382dcd92\opt\bin\cmake.exe --build ."
ninja: build stopped: subcommand failed.
FATAL ERROR: command exited with status 1: 'D:\ncs\noridc\toolchains\2d382dcd92\opt\bin\cmake.EXE' --build D:/fork/brand-board/build

* The terminal process terminated with exit code: 1.
* Terminal will be reused by tasks, press any key to close it.

I'm using zephyr v3.7.99, ncs v2.8.0 to be precise, and board is nrf5340dk, I believe the other boards perform similarly.

Compilation was no problem until the zephyr library was put into external Flash. And it runs without error.

I checked the documentation for XIP, but couldn't find answers to the following questions:

1. What are the naming conventions for libraries?

2. Which libraries can be redirected to external flash memory? If not, why not?

3. Which redirects are recommended and which are not?

I am Posting this question here so that others who have the same problem as me can refer to it.

Any answer to this question would be greatly appreciated.