[PATCH] bsps/raspberrypi: Add SEV Instruction for RPi SMP firmware changes.

[Pranav Dangi]

ping

On Mon, 9 Aug 2021, 16:43 pranav, <dangipranav at gmail.com> wrote:

> The Pi firmware added a wfe(wait for event), the cores 1-3 wait
> for the start address being written to the mailbox register, followed
> by a SEV poke to the mailbox that acts as a wfe wake-up event.
> ---
>  bsps/arm/raspberrypi/start/bspsmp.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/bsps/arm/raspberrypi/start/bspsmp.c
> b/bsps/arm/raspberrypi/start/bspsmp.c
> index 44f7a1d376..9dcfb0fb03 100644
> --- a/bsps/arm/raspberrypi/start/bspsmp.c
> +++ b/bsps/arm/raspberrypi/start/bspsmp.c
> @@ -42,6 +42,7 @@ bool _CPU_SMP_Start_processor( uint32_t cpu_index )
>    if (cpu_index != cpu_index_self) {
>
>      BCM2835_REG(BCM2836_MAILBOX_3_WRITE_SET_BASE + 0x10 * cpu_index) =
> (uint32_t)_start;
> +    _ARM_Send_event();
>
>      /*
>       * Wait for secondary processor to complete its basic initialization
> so
> --
> 2.30.2
>
>
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