When you want to use a spi device on rockpi through SPI1 as you mentioned, there are several steps you should do.
Fistly, you need to set spi1 as on, like
and ensble your your dtbo , like
intfc.dtoverlay=spi1-flash # spi1-flash is the name of your dtbo file without suffic .dtbo
Secondly, place your dtbo file, which is about your spi device (e.g. spi1-flash.dtbo), in /boot/overlays.
Thirdly, if necessary, you need to check whether there is the driver module attached to your spi device in the kernel.
By the way, which spi device do you use?