[PATCH 4/6] build: Add support to make bootloader images

[Sebastian Huber]

On 29.02.24 00:05, Chris Johns wrote:
>>> If it is will the details be exported in the pkgconfig file and made available
>>> for users building applications in a consistent and easy to use way?
>> Application build systems can query the tool using the RTEMS_MKIMAGE package
>> configuration varible, for example:
>>
>>    pkg-config --variable=RTEMS_MKIMAGE
>> ${prefix}/lib/pkgconfig/${ARCH}-${BSP_NAME}.pc
> Nice. This is my preferred way of handling this.
> 
>> If the BSP does not provide a tool, then the variable RTEMS_MKIMAGE is set to
>> "false".
> So the process has to be a single command?

Yes, a single command which is written in Python. For the U-Boot image 
it converts the ELF file to binary, then to a gz file, then to the 
U-Boot image.

> 
>> It could help to export also EXEEXT and BOOT_IMAGE_EXTENSION in the package
>> configuration file. For RTEMS 6, we should have a look how our package
>> configuration support can be used to build applications on some commonly used
>> build systems. We are currently not able to produce build images.
> Yes we should. I also wonder if base addresses and other values that get used
> should be prov
> 
>>> Is this output created along side the ELF file?
>> Yes.
> +1
> 
>>> Does this approach handle all BSPs that need this?
>> The BSP can use Python, so I would say yes.
> I am sorry I do not follow.

The script is written in Python, so this should be good enough to 
generate boot images for all kinds of BSPs.

> 
>>> Will you be converting all BSPs that need this type of support?
>> I will add support for the BSPs using U-Boot.
> Could you please provide the high level view of how this is to be handled? I
> have not reviewed all the detail in the patches to understand this and even then
> I may get things wrong.

The BSP provides an optional script to convert an ELF file into a boot 
image. In a Makefile it could be used like this:

EXEEXT = $(shell pkg-config --variable=EXEEXT $(PKG_CONFIG))
RTEMS_MKIMAGE = $(shell pkg-config --variable=RTEMS_MKIMAGE $(PKG_CONFIG))

ifeq ($(RTEMS_MKIMAGE), false)
APP = $(BUILDDIR)/app$(EXEEXT)
else
BOOT_IMAGE_EXTENSION = $(shell pkg-config 
--variable=BOOT_IMAGE_EXTENSION $(PKG_CONFIG))
APP = $(BUILDDIR)/app$(BOOT_IMAGE_EXTENSION)

%$(BOOT_IMAGE_EXTENSION): %$(EXEEXT)
	$(RTEMS_MKIMAGE) $^ $@
endif

> Should we create a GSoC project to review and support the other BSPs?

I would add the boot image support only if needed. There are probably 
more important things to do.

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