OSDev.org

Posted: **Sat Nov 02, 2024 3:13 pm**

I built OpenSBI (main branch) on macOS arm64 using the following command:

make LLVM=1 PLATFORM=GENERIC

The following two files it generates are of interest:

build/platform/generic/firmware/payloads/test.bin
build/platform/generic/firmware/fw_jump.bin

I can run the test.bin payload using the following command:

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qemu-system-riscv64 -nographic -M virt -smp 1 -m 512M -kernel ./build/platform/generic/firmware/payloads/test.elf

It outputs "Test payload running" and then goes into a low-power infinite loop.

However, I can't get it to work with the OpenSBI binary I just built. I tried the following command for that purpose:

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qemu-system-riscv64 -nographic -M virt -smp 1 -m 512M -bios ./build/platform/generic/firmware/fw_jump.bin -kernel ./build/platform/generic/firmware/payloads/test.bin

I confirmed with lldb that it does work—in that all expected breakpoints are hit and it eventually ends up in the infinite loop—but it doesn't generate the output string.

In both cases, I can see OpenSBI's output printed.

What could the problem be?

Posted: **Sun Nov 03, 2024 5:22 pm**

saraelsa wrote: ↑Sat Nov 02, 2024 3:13 pmOpenSBI (main branch)

Are you sure the main branch works? QEMU uses release versions of OpenSBI.

saraelsa wrote: ↑Sat Nov 02, 2024 3:13 pm
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make LLVM=1 PLATFORM=GENERIC

Is it case-sensitive? Maybe it needs to be "PLATFORM=generic" to build correctly.

saraelsa wrote: ↑Sat Nov 02, 2024 3:13 pmfw_jump.bin

Have you tried fw_dynamic.bin? It shouldn't make a difference, but that's the one QEMU uses.

Posted: **Tue Nov 05, 2024 5:57 pm**

Octocontrabass wrote: ↑Sun Nov 03, 2024 5:22 pm
saraelsa wrote: ↑Sat Nov 02, 2024 3:13 pmOpenSBI (main branch)
Are you sure the main branch works? QEMU uses release versions of OpenSBI.
saraelsa wrote: ↑Sat Nov 02, 2024 3:13 pm
Code: Select all
make LLVM=1 PLATFORM=GENERIC
Is it case-sensitive? Maybe it needs to be "PLATFORM=generic" to build correctly.

saraelsa wrote: ↑Sat Nov 02, 2024 3:13 pmfw_jump.bin
Have you tried fw_dynamic.bin? It shouldn't make a difference, but that's the one QEMU uses.

I tried compiling with lowercase 'generic' from branch release-1.5.x and loading fw_dynamic.bin. I get the same result.

I should note that OpenSBI itself prints a lot of output. It's only the payload that isn't able to print anything.

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