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I'm exploring qemu system emulation with custom-built Linux kernels, starting with mips. To start, I'm trying to get to the point of the kernel simply panicking before I add a rootfs, but I can't even get that far as there's no serial output:

enter image description here

serial_putc loops forever because uart_lsr_tx_empty never returns true. Why is that?

I run qemu with the following:

qemu-system-mips -m 1G -s -S -M malta -kernel mips_kernel -append "console=ttyS0" -nographic

I've tried every variant I could think of....I would think this would work out of the box. Thanks for any ideas.

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