Initial update of README for Mbed CE

[multiplemonomials]

This updates the README to reflect the new way that mcuboot and the mcuboot demo app work in Mbed CE.

Still to do:

• Explain how to enable encryption
• Explain how to add a new target to the JSON files

[zhiyong-ft]

Looks about right, spotted a few typo some of which are probably from me, will go over again tomorrow then add instructions about encrypted images in another PR

[zhiyong-ft]

@multiplemonomials is there a stable version of mbed-os/ce that we should use? I am trying to build a version for production usage. I tried to pull in the latest master, got many errors when trying to build.

[multiplemonomials]

Uh oh, what are the errors? btw, make sure to delete cache and reconfigure after updating the mbed-os submodule

[zhiyong-ft]

I deleted the entire folder under .\build\DISCO_F769NI\, got 100s if errors like the following, seems mostly if not all are multiple definition of xxx:

[build] D:/Temp/mbed-mcuboot-bootloader/mbed-os/connectivity/libraries/nanostack-libservice/source/libBits/common_functions.c:54: multiple definition of `bitcopy'; mbed-os/CMakeFiles/mbed-baremetal.dir/connectivity/libraries/nanostack-libservice/source/libBits/common_functions.c.obj:D:/Temp/mbed-mcuboot-bootloader/mbed-os/connectivity/libraries/nanostack-libservice/source/libBits/common_functions.c:54: first defined here
[build] c:/progra~2/gnuarm~1/102021~1.10/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: mbed-os/CMakeFiles/mbed-os.dir/connectivity/libraries/nanostack-libservice/source/libBits/common_functions.c.obj: in function `bitcopy0':
[build] D:/Temp/mbed-mcuboot-bootloader/mbed-os/connectivity/libraries/nanostack-libservice/source/libBits/common_functions.c:72: multiple definition of `bitcopy0'; mbed-os/CMakeFiles/mbed-baremetal.dir/connectivity/libraries/nanostack-libservice/source/libBits/common_functions.c.obj:D:/Temp/mbed-mcuboot-bootloader/mbed-os/connectivity/libraries/nanostack-libservice/source/libBits/common_functions.c:72: first defined here
[build] c:/progra~2/gnuarm~1/102021~1.10/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: mbed-os/CMakeFiles/mbed-os.dir/connectivity/libraries/nanostack-libservice/source/libip6string/ip6tos.c.obj: in function `ip6tos':
[build] D:/Temp/mbed-mcuboot-bootloader/mbed-os/connectivity/libraries/nanostack-libservice/source/libip6string/ip6tos.c:30: multiple definition of `ip6tos'; mbed-os/CMakeFiles/mbed-baremetal.dir/connectivity/libraries/nanostack-libservice/source/libip6string/ip6tos.c.obj:D:/Temp/mbed-mcuboot-bootloader/mbed-os/connectivity/libraries/nanostack-libservice/source/libip6string/ip6tos.c:30: first defined here
[build] c:/progra~2/gnuarm~1/102021~1.10/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: mbed-os/CMakeFiles/mbed-os.dir/connectivity/libraries/nanostack-libservice/source/libip6string/ip6tos.c.obj: in function `ip6_prefix_tos':
[build] D:/Temp/mbed-mcuboot-bootloader/mbed-os/connectivity/libraries/nanostack-libservice/source/libip6string/ip6tos.c:104: multiple definition of `ip6_prefix_tos'; mbed-os/CMakeFiles/mbed-baremetal.dir/connectivity/libraries/nanostack-libservice/source/libip6string/ip6tos.c.obj:D:/Temp/mbed-mcuboot-bootloader/mbed-os/connectivity/libraries/nanostack-libservice/source/libip6string/ip6tos.c:104: first defined here
[build] c:/progra~2/gnuarm~1/102021~1.10/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: mbed-os/CMakeFiles/mbed-os.dir/cmsis/CMSIS_5/CMSIS/RTOS2/RTX/Source/rtx_thread.c.obj: in function `osThreadFlagsSet':
[build] D:/Temp/mbed-mcuboot-bootloader/mbed-os/cmsis/CMSIS_5/CMSIS/RTOS2/RTX/Source/rtx_thread.c:1882: multiple definition of `osThreadFlagsSet'; mbed-os/CMakeFiles/mbed-baremetal.dir/rtos/source/ThisThread.cpp.obj:D:/Temp/mbed-mcuboot-bootloader/mbed-os/platform/include/platform/internal/mbed_atomic_impl.h:590: first defined here
[build] c:/progra~2/gnuarm~1/102021~1.10/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: mbed-os/CMakeFiles/mbed-os.dir/cmsis/device/rtos/TOOLCHAIN_GCC_ARM/mbed_boot_gcc_arm.c.obj: in function `software_init_hook':
[build] D:/Temp/mbed-mcuboot-bootloader/mbed-os/cmsis/device/rtos/TOOLCHAIN_GCC_ARM/mbed_boot_gcc_arm.c:55: multiple definition of `software_init_hook'; mbed-os/CMakeFiles/mbed-baremetal.dir/platform/source/mbed_sdk_boot.c.obj:D:/Temp/mbed-mcuboot-bootloader/mbed-os/platform/source/mbed_sdk_boot.c:168: first defined here
[build] c:/progra~2/gnuarm~1/102021~1.10/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: mbed-os/CMakeFiles/mbed-os.dir/cmsis/device/rtos/TOOLCHAIN_GCC_ARM/mbed_boot_gcc_arm.c.obj: in function `__wrap_main':
[build] D:/Temp/mbed-mcuboot-bootloader/mbed-os/cmsis/device/rtos/TOOLCHAIN_GCC_ARM/mbed_boot_gcc_arm.c:92: multiple definition of `__wrap_main'; mbed-os/CMakeFiles/mbed-baremetal.dir/platform/source/mbed_sdk_boot.c.obj:D:/Temp/mbed-mcuboot-bootloader/mbed-os/platform/source/mbed_sdk_boot.c:188: first defined here
[build] c:/progra~2/gnuarm~1/102021~1.10/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: mbed-os/CMakeFiles/mbed-os.dir/cmsis/device/rtos/source/mbed_boot.c.obj: in function `mbed_init':
[build] D:/Temp/mbed-mcuboot-bootloader/mbed-os/cmsis/device/rtos/source/mbed_boot.c:75: multiple definition of `mbed_init'; mbed-os/CMakeFiles/mbed-baremetal.dir/platform/source/mbed_sdk_boot.c.obj:D:/Temp/mbed-mcuboot-bootloader/mbed-os/platform/source/mbed_sdk_boot.c:77: first defined here
[build] c:/progra~2/gnuarm~1/102021~1.10/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: mbed-os/CMakeFiles/mbed-os.dir/cmsis/device/rtos/source/mbed_boot.c.obj:D:/Temp/mbed-mcuboot-bootloader/mbed-os/cmsis/device/rtos/source/mbed_boot.c:72: multiple definition of `mbed_stack_isr_size'; mbed-os/CMakeFiles/mbed-baremetal.dir/platform/source/mbed_sdk_boot.c.obj:D:/Temp/mbed-mcuboot-bootloader/mbed-os/platform/source/mbed_sdk_boot.c:34: first defined here
[proc] The command: "C:\Program Files\CMake\bin\cmake.EXE" --build d:/Temp/mbed-mcuboot-bootloader/build/DISCO_F769NI-Debug --config Debug --target all -- exited with code: 1
[build] c:/progra~2/gnuarm~1/102021~1.10/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld.exe: mbed-os/CMakeFiles/mbed-os.dir/cmsis/device/rtos/source/mbed_boot.c.obj:D:/Temp/mbed-mcuboot-bootloader/mbed-os/cmsis/device/rtos/source/mbed_boot.c:71: multiple definition of `mbed_stack_isr_start'; mbed-os/CMakeFiles/mbed-baremetal.dir/platform/source/mbed_sdk_boot.c.obj:D:/Temp/mbed-mcuboot-bootloader/mbed-os/platform/source/mbed_sdk_boot.c:33: first defined here

In the problems tab in VS Code, there is this entry that might be relevant:

[{
	"resource": "/D:/Temp/mbed-mcuboot-bootloader/mbed-os/tools/cmake/app.cmake",
	"owner": "cmake-configure-diags",
	"severity": 4,
	"message": "CMake Warning (dev) at mbed-os/tools/cmake/app.cmake:37 (enable_language):project() should be called prior to this enable_language() call.",
	"source": "CMake (enable_language)",
	"startLineNumber": 37,
	"startColumn": 1,
	"endLineNumber": 37,
	"endColumn": 10000,
	"relatedInformation": [
		{
			"startLineNumber": 6,
			"startColumn": 1,
			"endLineNumber": 6,
			"endColumn": 1000,
			"message": "In call to 'include' here",
			"resource": "/D:/Temp/mbed-mcuboot-bootloader/CMakeLists.txt"
		}
	]
}]

This is from mbed-os commit: 722c2f119647e14f1f44d6e1e54041b4442e63b4. I am still learning the ropes of CMake, so it is possible I messed up something outside of mbed-os.

[multiplemonomials]

I bet you have the wrong version of mcuboot checked out. It will end up linking mcuboot to mbed-os and will cause errors like this. (mbed-os is an OBJECT library and must only be linked to the final executable)

[zhiyong-ft]

I think you are right. Somehow I have MCUboot commit: 7cc60059845d4252773f538aa50e0906c34f7bd5. Once I checked out the latest version from your repo: de8c4b0b57d2c1b7b81e9bde412198e161890633, compilation is no longer a problem. Thanks.