Through web admin interface,I had added qemu device,and web devices list can display qemu device. It seems qemu device had startuped ok.
We know that if linux device startup successfully it must included uboot and kernel image. But where are the uboot image and kernel image of qemu ?
Don't confuse U-Boot and QEMU - these are radically different implementations. You cannot simply transfer U-Boot instructions to QEMU or vice versa.
In which config file is described the path of uboot and kernel image?
For QEMU, the path to the image file(s) comes only from the test job and all arguments to complete the QEMU command line to be able to boot that image also need to come from the test job, sometimes using the job context. Using QEMU for ARM boots is NOT trivial, it can take a lot of trial and error to get the right command line to QEMU. We have Aarch64 QEMU examples but actual QEMU testing of ARM kernels which would typically be used with U-Boot is a long task that requires quite a bit of knowledge of the QEMU command line options.
The LAVA documentation advises starting with QEMU using the standard (x86_64) images because these are the simplest to run in QEMU. This allows you to become familiar with how the LAVA UI operates and how to administer the instance. The differences between QEMU and any other DUT based test job (not just U-Boot) are too large to expect to use QEMU as an alternative to U-Boot for the same image files, in most cases.