Booting CLFS with qemu-system-riscv64

So I was working on cross compiling LFS from x86_64 to RISC-V these 
days, and everything seems to work out for me except when I was trying 
to boot the system with qemu-system-riscv64. This is the command I used 
to start QEMU:

qemu-system-riscv64 -nographic -machine virt \

-drive 
if=pflash,unit=0,format=raw,readonly=on,file=/usr/share/qemu-efi-riscv64/RISCV_VIRT_CODE.fd 
\

-drive 
if=pflash,unit=1,format=raw,file=/usr/share/qemu-efi-riscv64/RISCV_VIRT_VARS.fd 
\

-drive file=/dev/loop0,format=raw

where the UEFI firmware I used was installed direclty from the debian 
package qemu-efi-riscv64.


Then I was stuck at the GRUB stage where GRUB was unable to load the 
kernel image like this:

grub> boot
script/lexer.c:336:lexer: token 288 text [boot]
script/script.c:50:scripting: malloc 0x831e5de0
script/script.c:50:scripting: malloc 0x831e5da0
script/script.c:163:scripting: arglist
script/script.c:50:scripting: malloc 0x831e5d40
script/lexer.c:336:lexer: token 259 text [
]
script/script.c:50:scripting: malloc 0x831e5ce0
script/script.c:50:scripting: malloc 0x831e5ca0
script/script.c:198:scripting: cmdline
script/script.c:50:scripting: malloc 0x831e5c40
script/lexer.c:336:lexer: token 0 text []
script/script.c:50:scripting: malloc 0x831e5ec0
script/script.c:50:scripting: malloc 0x831e5c00
script/script.c:294:scripting: append command
script/script.c:50:scripting: malloc 0x831e5bc0
kern/verifiers.c:212:verify: string: boot, type: 2
error: cannot load image.


However, I can boot the system WITHOUT GRUB with the following command:

qemu-system-riscv64 -nographic -machine virt -kernel 
/mnt/temp/boot/vmlinuz -append "root=/dev/vda ro console=ttyS0" -drive 
file=/dev/loop0p3,format=raw


I think either the GRUB is broken or the UEFI firmware I used for QEMU 
is broken, or both are incompatible. I don't know if this is a common 
issue or I made some silly mistakes, could anyone please take a look if 
encounter similar issue? Thank you!


BTW this is the command I used to configure GRUB:

./configure --prefix=$LFS/tools        \
             --build=$(build-aux/config.guess) \
             --host=$(build-aux/config.guess)  \
             --sysconfdir=$LFS/etc    \
             --disable-efiemu     \
             --with-platform=efi  \
             --program-prefix=lfs-             \
             --target=$LFS_TGT      \
             --disable-werror


  the command I used to grub-install the disk:

$LFS/tools/sbin/lfs-grub-install          \
     --target=riscv64-efi                     \
     --efi-directory=/mnt/temp/boot/efi \
     --boot-directory=/mnt/temp/boot \
     --bootloader-id=GRUB \
     --removable \
     /dev/loop0

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