K22F and KW38-ER-RD board

[povalac]

Hello team,

I would like to add a new HIC device K22F and KW38-ER-RD board from NXP to the repo. Can you please check it?

Thank you in advance.
Best regards,
Karel Povalac

[mathias-arm]

Similarly to #674. We would prefer to merge new HICs after support for GCC is merged. Would you be able to rebase that PR on experimental_compilers?

[mbrossard]

I rebased on experimental_compilers and did some changes to support GCC. I split the K22F part into mbrossard:feature/k22f_hic, and the KW38 interfaces in mbrossard:feature/k22f_kw38_if. I was able to do some smoke testing with a FRDM-K22F (it seems with current configuration the HIC thinks the reset button is pushed, so it will always jump into bootloader).

I have a few questions:

• Why did you change the HIC ID?
• It seems the bootloader also has some compilation time assert to check the bootloader and interface sizes are 32 KB and 96 KB respectively. So I made the changes in daplink_addr.h to limit Flash to 128 KB, and limited RAM to 24 KB. Those changes make it possible to target MCUs from the K22_100 sub-family (like MK22FN128*10) in addition to the ones in K22_120 (like MK22FN512*12). Was this your intent also when you chose the bl/if sizes?
• There is a K22_50 sub-family and I was wondering if this is why you chose to use 48 MHz clock?
• What is the reason for using #if defined(IINTERFACE_K22F) in source/hic_hal/freescale/k22f/gpio.c? It seems to me the INTERFACE_K22F is always set (for both bootloader and interface).

Without the proper hardware it is not possible for me to fully test. If you can test and fix on top of the feature/k22f_hic and update your PR to target experimental_compilers. I would prefer to keep the PR for HIC and boards separate.