Re: NetBSD/evbarm on qemu

[Jared McNeill <jmcneill%invisible.ca@localhost>]

On Fri, 2 Jun 2017, Jared McNeill wrote:

> Some known issues (feel free to help with fixes!)
>
> - The vexpress-a15 machine is a dual CPU machine. By default qemu enables
>   a single CPU; use the '-smp 2' flag to turn on the second one. The kernel
>   knows how to spin up the secondary CPU, but the gic driver fails
>   shortly after the CPU finishes attaching:

Nick fixed this with r1.22 of sys/arch/arm/cortex/gic.c (thanks!)

> - If you request more than 128MB of RAM ('-m 1024m' flag) the kernel
>   will fail to boot. This is because qemu will load the dtb at a higher
>   address (88000000 / +128MB from start) when emulating more than 128MB
>   of RAM and the initial MMU table only maps the first 128MB. Workaround
>   this by changing INIT_MEMSIZE from 128 to 256 in
>   sys/arch/evbarm/vexpress/vexpress_start.S. Note that a kernel built
>   with this change will no longer boot with the default (128m) memory
>   settings.

This is no longer needed as of r1.5 of sys/arch/evbarm/vexpress/vexpress_start.S

Cheers,
Jared