Zephyr Does not Appear To Respect my_board.yaml

[markovejnovic]

Hey everyone! I am currently trying to create a new board in zephyr. I have designed a custom PCBA and I am now attempting to write the firmware for it. I am quite new to zephyr (coming from FRTOS) so this is a new-ish experience for me.

I am trying to build my app/ out-of-tree and have added it to my workspace. Currently, my app is empty as I am trying to setup the basics for my board. I can confirm that

west build -p always -b nucleo_f412zg

successfully builds my program.

I have the following file structure (my board's name is biologger)

.
└── app/
    ├── boards/arm/biologger/
    │   ├── Kconfig.biologger
    │   ├── Kconfig.defconfig
    │   ├── biologger.dts
    │   ├── biologger.yaml
    │   ├── biologger_defconfig
    │   └── board.yml
    ├── src/
    │   └── main.c - empty
    ├── CMakeLists.txt - only calls find_package(Zephyr)
    ├── VERSION - minimal
    └── prj.conf - empty

When I try to run west to build this board:

west build -p always -b biologger -- -DBOARD_ROOT=.

it fails on me saying that FLASH and RAM both overflowed. I looked into autoconf.h and noticed

#define CONFIG_SRAM_SIZE 0
#define CONFIG_SRAM_BASE_ADDRESS 0x0

which would explain why my app overflows! 😆

But... the problem now is that I can't seem to figure out why autoconf.h doesn't have the specified memory. My biologger.yaml is:

identifier: biologger
name: BioLogger
type: mcu
arch: arm
toolchain:
  - zephyr
  - gnuarmemb
  - xtools
ram: 256
flash: 1024
supported:
  - i2c
  - gpio
  - usb_device
vendor: other

so I would imagine that the build system should respect my 256K of ram and 1024K of flash.

Comparing this to boards/st/nucleo_f412zg/, it appears there is no explicit case where nucleo also sets the kconfig CONFIG_SRAM_SIZE field... Yet somehow its autoconf.h does have the correct value:

#define CONFIG_SRAM_SIZE 256
#define CONFIG_SRAM_BASE_ADDRESS 0x20000000

I therefore inferred that the .yaml is where the build system should attempt to pull this information from.

I have a representative repo here.
The zephyr repo hash is c211cb3

Thank you all for zephyr! Apologies if my question is wasteful of your time -- I couldn't find anything in issues/discussions.

Thanks!

[adri1mart1]

Hello,

I think you are just missing

/ {
    chosen {
        zephyr,sram = &sram0;
    };
};

See link

I advise you to use all zephyr chosen "aliases" so that you can easily compile and test zephyr examples. link

Regards,
Adrien M.

[markovejnovic]

Hi Adrien! Thank you so much! That did the trick! Appreciate your help very much!

Thanks a bunch, very much appreciated!

• Marko