Hi,

First time nerves/elixir/elinux user here. Hope this is the correct place to post a question like this, I have looked through the github documentation for fwup but couldn’t find an answer. Hopefully didn’t miss something there.

I’m prototyping nerves on the STMicroelectrons STM32MP157C-DK2 for a custom board that we are developing that is in the beginning of schematics. I have the nerves-system up and running, got the examples to work fine. But, in order to boot properly, I have to run an external command to mix firmware.burn to set the boot flags in the protective MBR. Here is my partition structure:

±---------------------------+

| GPT |

±---------------------------+

| Firmware configuration data|

| (formatted as uboot env) |

±---------------------------+

| p0: fsbl1 |

| u-boot-spl.stm32 |

±---------------------------+

| p1: fsbl2 |

| u-boot-spl.stm32 |

±---------------------------+

| p2: ssbl |

| u-boot.img |

±---------------------------+

| p3: Rootfs A |

| rootfs.squashfs |

| zImage |

| stm32mp157c-dk2.dtb |

| root filesystem |

±---------------------------+

| p4: Rootfs B |

| rootfs.squashfs |

| zImage |

| stm32mp157c-dk2.dtb |

| root filesystem |

±---------------------------+

| p5: Application (f2fs) |

±---------------------------+

The commands I run to set the boot flags are:
>sudo sgdisk -A 4:set:2 /dev/sdb
>sudo sgdisk -A 5:set:2 /dev/sdb

Is there a way to either do this with fwup, or integrate a post firmware.burn script into mix? I’ve tried the following in fwup.conf:
partition 3 {
guid = 5278721d-0089-4768-85df-b8f1b97e6684 # ID for partition 3 (create with uuidgen)
type = 0fc63daf-8483-4772-8e79-3d69d8477de4
name = “rootfs”
block-offset = ${ROOTFS_A_PART_OFFSET}
block-count = ${ROOTFS_A_PART_COUNT}

boot = true

}

If uncommented, the boot=true causes fwup to error out. Thanks for any responses.