Re: [PATCH 1/3] hw/arm/virt: Add serial aliases in DTB

[Philippe Mathieu-Daudé]

On 23/10/23 18:15, Peter Maydell wrote:
> If there is more than one UART in the DTB, then there is no guarantee
> on which order a guest is supposed to initialise them.  The standard
> solution to this is "serialN" entries in the "/aliases" node of the
> dtb which give the nodename of the UARTs.
>
> At the moment we only have two UARTs in the DTB when one is for
> the Secure world and one for the Non-Secure world, so this isn't
> really a problem. However if we want to add a second NS UART we'll
> need the aliases to ensure guests pick the right one.
>
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
> ---
>   hw/arm/virt.c | 4 ++++
>   1 file changed, 4 insertions(+)


> @@ -889,7 +891,9 @@ static void create_uart(const VirtMachineState *vms, int 
> uart,
>   
>       if (uart == VIRT_UART) {

I'd have put this patch after the rename (#2 <-> #1). Anyhow,

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>

>           qemu_fdt_setprop_string(ms->fdt, "/chosen", "stdout-path", nodename);
> +        qemu_fdt_setprop_string(ms->fdt, "/aliases", "serial0", nodename);
>       } else {
> +        qemu_fdt_setprop_string(ms->fdt, "/aliases", "serial1", nodename);
>           /* Mark as not usable by the normal world */
>           qemu_fdt_setprop_string(ms->fdt, nodename, "status", "disabled");
>           qemu_fdt_setprop_string(ms->fdt, nodename, "secure-status", "okay");