如何在没有“bootm”命令的u-boot中启动内核映像?

I am working on a simple OS for arm using qemu and uboot. I can load uboot fine and can load the image with using the 'bootm' command followed by the corresponding address. I want the kernel image to load automatically without having to call bootm. I added "#define CONFIG_BOOTCOMMAND "bootm 0x28124"" to the versatile.h file and it loads automatically, but the issue is that this address can change. I am using versatilepb and I thought it was strange that uboot is missing a lot of the commands that the documentations says it should have. I am working on a simple OS for arm using qemu