How do I run a baremetal hello world program?

[Jeban2]

I've managed to follow the repository and run a hello world code on the Debian Linux. Now how would i go about configuring the bootloader such that it doesn't launch the Debian Linux but rather a simple bare-metal hello world program?

[eugene-tarassov]

You don't need to modify bootloader.

I have added simple bare metal hello world example to the repo: bare-metal. You can put in on SD card instead of Linux.

[Jeban2]

Sorry sir could you elaborate on this? /mk-sd-card partitions the SD card according to the debian-riscv64 directory. When i manually put the boot.elf file on the SD the console returns "cannot access SD card". Is there a specific way to do it?

[mwrnd]

mk-sd-card expects vivado-risc-v/debian-riscv64/debian-riscv64.sd.img which is generated using mk-sd-image. Try overwriting workspace/boot.elf with a custom version. mk-sd-image makes use of workspace/boot.elf in two places but it is easier to just try overwriting it first.

[DuyTrandeLion]

@eugene-tarassov What if my board does not have an SD card? I ported the project to the Arty-A7-100 board but I don't know how to test it.

[mwrnd]

Refer to this thread for help with testing the bare-metal demo.

[davekeeshan]

I have bare metal working on riscv64 on an arty7-100, what is required, or what needs to be changed to get it working on riscv32?

I have compiled the riscv-toolchain from source, and this riscv64 is enough to get a working "Hello world", I also have access to riscv32 through this path.

[eugene-tarassov]

The README in bare-metal describes both 64-bit and 32-bit cases.

[davekeeshan]

So it does, my mistake, thanks for that.