How and what tools and I need to use spike for run on bare metal risc-v?

[JUAN JOSE ROMERO HERNANDEZ]

I need to make a program that has access in machine mode (M) for use interrupts that reason I need to run it on bare metal (without pk). I have installed the following risc- v tools: riscv-gnu-toolchain, spike.

I tried to follow these steps but got the following error

How can I generate a bare metal binary using riscv64-unknown-elf-gcc and simulate with spike?

Thank you for the time and attention.

[Jim Wilson]

If you are using a 64-bit target that puts DRAM at 0x80000000, then you need a toolchain that uses the medany code model.  If you aren't using any precompiled libraries, then -mcmodel=medany will work.  But if you need libgcc, libc, etc also compiled using medany code model, then you need to configure a toolchain that uses medany by default.  I do see C library errors, so it looks like you do need a medany toolchain.  You can do this with riscv-gnu-toolchain by using --with-cmodel=medany when configuring the toolchain before building it.

There is an old blog post by Palmer Dabbelt that talks about code models

https://www.sifive.com/blog/all-aboard-part-4-risc-v-code-models

You might be interested in other parts of this same blog series.  Part 2 talks about the relocation truncated to fit linker error.

Jim

[JUAN JOSE ROMERO HERNANDEZ]

Hi Jim, I was able to understand and solve my problem with this information.

Thanks a lot!

Juan romero