How to start Linux with U-boot?

I have U-boot running in my Pi and can use it with commands.
My SD card contains a Linux file, presently renamed to "kernel_old.img" as
"kernel.img" is used to start U-boot.
I assume that it is possible to start "kernel_old.img" from U-boot with some
command. I can however not figure out how.
1: Is it possible to start the Linux kernel according to the procedure
2: If so, which is the command?
Reply to
Bengt Törnqvist
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