[isar-cip-core] porting isar-cip-core to iwg20m

[<daniel.sangorrin@toshiba.co.jp>]

Hi Jan,

I am trying to port isar-cip-core to the iwg20m board.

So far I managed to create a WIC SDCard image with 2 partitions:
- boot: an VFAT partition to store the uImage and devicetree
- root: the root filesystem
[Note] u-boot.bin is installed on an SPI memory with a JTAG debugger, so it's not in the image.

I would appreciate your help with a couple of problems:

- The kernel is built correctly, but I need to transform it into an uImage. I guess I can install u-boot-tools and do a mkimage in some postinstall script, but isn't this supposed to be automatized?
For example, in meta-debian, I just need to define KERNEL_IMAGETYPE=uImage and the UBOOT_ENTRYPOINT. The rest is done for me.

- In case, I want to build u-boot (not strictly necessary but it would be good to have it), do I have to create a whole recipe including debian rules like in the jailhouse-images repository [1]!?
In meta-debian, I just need to define a few variables (git repo, config, entrypoint) and the u-boot packages will be created automatically. Those scripts may be needed for very detailed customization (e.g. Trusted firmware), but the common case should be automatized.
[1] https://github.com/siemens/jailhouse-images/tree/master/recipes-bsp/u-boot

- What is the correct way to specify the device tree for the kernel?
I added DTB_FILE="mydt.dtb" to my machine config, and then added that to IMAGE_BOOT_FILES. That worked, but is that the correct way to do it? There is no documentation about this.

- For the kernel configuration, I want to use shmobile_defconfig (already in the kernel source) plus a few extra configurations that I have on another file. Is that possible? So far I had to concatenate my configurations to shmobile_defconfig which is redundant.

- How can I install the kernel into the boot partition?
Currently, the kernel binary and symbols are deployed into the the /boot folder of the "root" partition instead of the "boot" partition. I would like the /boot folder to be deployed into the FAT partition. And maybe also get fstab filled automatically.

I send the actual code/metadata separately on another e-mail.
https://lists.cip-project.org/pipermail/cip-dev/2019-June/002409.html

Thanks,
Daniel