Logging Flash Backend

[mkscheble]

Hello, 

I am currently using the bt and uart backend for zephyr logging on ncs 2.9.2. I want to be able to save logs to flash which will be useful in debugging/ and be able to download the logs from shell interface. I have seen a few documents that the flash backend has not been implemented for logging but want to check if there is any documentation on doing so and how to get started?

Thanks!

[Kenneth]

Hi,

Can you check out this case:  demo about CONFIG_LOG_BACKEND_FS=y  

Kenneth

[mkscheble]

Thanks Kenneth! Do I still need to manually mount

struct fs_mount_t *mp = &FS_FSTAB_ENTRY(PARTITION_NODE);

    rc = fs_mount(mp);    

   

    rc = fs_opendir(&dir, CONFIG_LOG_BACKEND_FS_DIR and change my memory mapping? 

[Kenneth]

Hi,

Sorry, don't know (based on the linked case it looks to be required).

Kenneth

[mkscheble]

Hi Kenneth, I put aside 16 kb for my log partition (I just want to store the previous power cycles log). This matches across my pm_static.yml and overlay file. I also added the following kconfig. From here, I get build errors when adding the mounting point (above). What else do I need to add? Is there any examples that I can look at that could help me out? Thanks in advance. 

CONFIG_FILE_SYSTEM=y
CONFIG_LOG_BACKEND_FS=y
CONFIG_LOG_BACKEND_FS_DIR="/lfs"
CONFIG_LOG_BACKEND_FS_FILES_LIMIT=2
CONFIG_LOG_BACKEND_FS_AUTOSTART=y
CONFIG_FILE_SYSTEM_LITTLEFS=y

 

[Kenneth]

The "tests/subsys/logging/log_backend_fs" might be useful.

Kenneth