Hi,
I am learning building arm64 kernel on: https://wiki.linaro.org/HowTo/BuildArm64Kernel

I followed the page and started the kernel, because I didn't indicate a mmc deivce,
the console outputs as below:
VFS: Cannot open root device "vda2" or unknown-block(254,2): error -6
Please append a correct "root=" boot option; here are the available partitions:
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(254,2)

 I had download the pre-built root filesystem, but I don't know how to use it.
Could anyone tell me how to mount rootfs? Thank you!

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Regards,
Zhi-zhou