[Bug 1898883] [NEW] qemu-system-riscv64 failed to load binary kernel into memory

[Azuk 443]

Public bug reported:

QEMU Version: 5.1.0
Compiled in Ubuntu 20.04 for riscv64, following the guide 
https://risc-v-getting-started-guide.readthedocs.io/en/latest/linux-qemu.html.

In qemu-system-riscv64, code at 0x80000000 will be executed by virtual CPU.
For example, using `qemu-system-riscv64 -nographic -machine virt -bios none 
-kernel vmlinux -S -s`, my homebrew kernel(ELF file) will load at 0x80000000. 
If I strip the kernel using `riscv64-linux-gnu-objcopy -O binary vmlinux 
Image`, qemu-system-riscv64 will not load the binary machine code into the 
riscv64 load address, but `-bios Image` will.

In `qemu-system-aarch64` compiled by Ubuntu team, I can use `qemu-
system-aarch64 -M raspi3 -kernel Image_aarch64 -S -s` to load a specific
machine code binary into 0x80000. And the elf kernel can be loaded to
that address, too.

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1898883

Title:
  qemu-system-riscv64 failed to load binary kernel into memory

Status in QEMU:
  New

Bug description:
  QEMU Version: 5.1.0
  Compiled in Ubuntu 20.04 for riscv64, following the guide 
https://risc-v-getting-started-guide.readthedocs.io/en/latest/linux-qemu.html.

  In qemu-system-riscv64, code at 0x80000000 will be executed by virtual CPU.
  For example, using `qemu-system-riscv64 -nographic -machine virt -bios none 
-kernel vmlinux -S -s`, my homebrew kernel(ELF file) will load at 0x80000000. 
If I strip the kernel using `riscv64-linux-gnu-objcopy -O binary vmlinux 
Image`, qemu-system-riscv64 will not load the binary machine code into the 
riscv64 load address, but `-bios Image` will.

  In `qemu-system-aarch64` compiled by Ubuntu team, I can use `qemu-
  system-aarch64 -M raspi3 -kernel Image_aarch64 -S -s` to load a
  specific machine code binary into 0x80000. And the elf kernel can be
  loaded to that address, too.

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