There is a todo in the putchar stub. Looks like it’s not implemented yet.
I have it implemented here in my own roughly 1k line zig kernel: https://github.com/Fingel/aeros-v/blob/ddc6842291e9cf4876729...
I have it implemented here in my own roughly 1k line zig kernel: https://github.com/Fingel/aeros-v/blob/ddc6842291e9cf4876729...
I did see the putchar stub in the user.zig but, lacking understanding of zig, wasn’t sure how that could work given common.zig is looking for putChar in kernel.zig as far as I could tell.
I just jumped through a couple of hoops to get zig 0.13 installed and see an error about “root struct of file ‘kernel’ had no member named ‘putchar’” so I guess maybe it’s not implemented here at all.
Are you saying you had trouble getting putchar working in my implementation? As far as I know common.console is fully implemented and working. Let me know if something is wrong.
What you mention about VGA being common on x86 was what got me curious, since it’s not a thing on riscv. In my own OS project I’m using a framebuffer to show a graphical terminal on both x86 and riscv64 so I wondered if OP was doing similar or was really using SBI output.