How do I set console loglevel in WB40/WB45 in run time and how to keep the setting even after next boot?

To change the loglevel in run time, you can echo the number to /proc/sys/kernel/printk. However, this setting is in RAM and won't be kept in next boot. # echo 8 > /proc/sys/kernel/printk To keep this setting, you need to set it in bootargs in boot loader configuration. Such as add an extra setting "loglevel=4" as below. bootargs='mem=32M console=ttyS0,115200 ubi.mtd=6 root=ubi0:rootfs rootfstype=ubifs loglevel=4 rootflags=bulk_read,chk_data_crc rw'