Using MCUboot causing issues with zero latency IRQs

RE: Using MCUboot causing issues with zero latency IRQs

jim-cat — Mon, 18 Dec 2023 22:23:42 GMT

I found the issue, thanks for your support.

The mcuboot partition was causing issues with the LITTLEFS partition on the internal flash. I created a pm_static.yml and set CONFIG_PM_PARTITION_REGION_LITTLEFS_EXTERNAL=y to move the LITTLEFS partition to my external flash. After that, my issues with interrupts were resolved.

RE: Using MCUboot causing issues with zero latency IRQs

AHaug — Fri, 15 Dec 2023 14:52:11 GMT

Hi,

I've had a look at the diff but I were not able to pinpoint what could cause ZLIRQs to be overwritten by config_mcuboot=y so I will have to ask the bootloader team for some input. But as you state, the isr_tables are different so there must be something that overwrites the ZLI configurations.

I will reach out to you again next week when I know some more, and in the meanwhile let me know if you're able to identify what overwrites the configuration

Kind regards,
Andreas

RE: Using MCUboot causing issues with zero latency IRQs

jim-cat — Wed, 13 Dec 2023 19:19:35 GMT

Hello and thank you for your help. I took a look at the differences and noticed that the generated isr_tables.c files were different.

Here's the device tree flash setup (1MB internal flash).

&flash0 {

partitions {

compatible = "fixed-partitions";

#address-cells = <1>;

#size-cells = <1>;

boot_partition: partition@0 {

label = "mcuboot";

reg = <0x0 0xc000>;

};

slot0_partition: partition@c000 {

label = "image-0";

reg = <0xc000 0x77000>;

};

slot1_partition: partition@83000 {

label = "image-1";

reg = <0x83000 0x77000>;

};

Diff of the build/zephyr/.config files with and without mcuboot enabled:

/cfs-file/__key/communityserver-discussions-components-files/4/diff.html

build/zephyr/.config (without mcuboot):

devzone.nordicsemi.com/.../config_5F00_without_5F00_mcuboot.txt

build/zephyr/.config (with mcuboot):

devzone.nordicsemi.com/.../config_5F00_mcuboot.txt

RE: Using MCUboot causing issues with zero latency IRQs

AHaug — Tue, 12 Dec 2023 12:46:35 GMT

Hi,

Could you compare your .config from build/zephyr with and without CONFIG_BOOTLOADER_MCUBOOT=y and spot any differences? My thoughts are that there might be something that overwrites some of your ZLI configurations that may lead to the increased latency.

Kind regards,
Andreas