On 12/7/20 1:56 PM, Mitchell Horne wrote:
As you suggest, it is possible to overwrite the default root device in
the kernel config, by adding a line such as:
options ROOTDEVNAME=\"ufs:/dev/vtbd0p3\"
Thank you for the syntax!
You can also override it using the QEMU commandline, which is simpler
since you won't need to recompile anything. Adding the following
argument should suffice:
-append="vfs.root.mountfrom=ufs:/dev/vtbd0p3"
Note that you can set arbitrary kernel environment variables this way ^^
My string:
qemu-system-riscv64 -machine virt -m 2048M -smp 2 -nographic -kernel
/vms/riscv/kernel -bios
/usr/local/share/opensbi/lp64/generic/firmware/fw_jump.elf
-append="vfs.root.mountfrom=ufs:/dev/vtbd0p3" -drive
file=$1,format=raw,id=hd0 -device virtio-blk-device,drive=hd0 -netdev
tap,ifname=tap0,script=no,id=net0
Reports: -append=vfs.root.mountfrom=ufs:/dev/vtbd0p3: invalid option
I have tried it both there after ...elf and at the end of the string. Is
this perhaps the wrong position?
Finally, we do have support for loader.efi on RISC-V, although I have
not yet documented how to use it on the wiki page. If you would like
to try this method, please follow up with me and I can provide
instructions.
I am happy to if it is ready for public consumption.
Otherwise, you can expect to see weekly RISC-V snapshots appear in the
next week or two, and I will ensure that the wiki page is up to date
with how to run them.
Thank you and keep up the good work!
Michael
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