On Sat, Mar 23, 2019 at 6:35 PM Rick Payne <[email protected]> wrote:
>
>
> So I'm not actually using hardware for now. I'm using qemu-system-
> aarch64 as shown on the wiki page:
>
> qemu-system-aarch64 -S -s -nographic -machine virt -kernel
> build/release.aarch64/loader.img -cpu cortex-a57 -m 1024M -append "
> --nomount /tools/uush.so"
>
Would be nice if we had a script for that. Perhaps even an option to
scripts/run.py.
Why the "-S"? It causes the machine not really to start.
If I run the above without "-S" I get:
OSv v0.53.0-3-g8cd7d8aa
dtb_setup: failed to move dtb (dtb too large?)
Halting.
QEMU: Terminated
Which is a different problem than you reported.
> The problem I'm having is that the assignment of the pl011 serial
> driver to the early console port isn't working, and thus we end up with
> no method for console::arch_early_console.write. I made this quick
> hack:
>
I don't know anything about "pl011", but maybe qemu doesn't emulate it,
or our driver doesn't know how to recognize qemu's version of it?
(just a wild guess).
> diff --git a/arch/aarch64/arch-setup.cc b/arch/aarch64/arch-setup.cc
> index 4f4be836..24a4e6a8 100644
> --- a/arch/aarch64/arch-setup.cc
> +++ b/arch/aarch64/arch-setup.cc
> @@ -185,7 +185,9 @@ void arch_init_early_console()
> }
>
> new (&console::aarch64_console.pl011) console::PL011_Console();
> + console::aarch64_console.pl011.write("a", 1);
> console::arch_early_console = console::aarch64_console.pl011;
> + console::arch_early_console.write("b", 1);
> int irqid;
> u64 addr = dtb_get_uart(&irqid);
> if (!addr) {
>
> and I get 'a' printed, but the call to
> console::arch_early_console.write fails.
>
> Why can't we assign there?
>
> Rick
>
>
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