LAVA should try to detect some error pattern after starting the kernel. (but before any Starting kernel prompt) Example: booti 0x40000000 0x43300000 0x43000000 bootloader-commands: Wait for prompt Starting kernel (timeout 00:03:45) booti 0x40000000 0x43300000 0x43000000 Wrong Ramdisk Image Format Ramdisk image is corrupt or invalid

Other possible problem are reset leading to another uboot prompt.