Hi,

> -----Original Message-----
> From: Lim, Jit Loon <[email protected]>
> Sent: Wednesday, 31 August, 2022 2:46 PM
> To: [email protected]
> Cc: Jagan Teki <[email protected]>; Vignesh R
> <[email protected]>; Vasut, Marek <[email protected]>; Simon
> <[email protected]>; Chee, Tien Fong
> <[email protected]>; Hea, Kok Kiang <[email protected]>;
> Lim, Elly Siew Chin <[email protected]>; Kho, Sin Hui
> <[email protected]>; Lokanathan, Raaj <[email protected]>;
> Maniyam, Dinesh <[email protected]>; Ng, Boon Khai
> <[email protected]>; Yuslaimi, Alif Zakuan
> <[email protected]>; Chong, Teik Heng
> <[email protected]>; Zamri, Muhammad Hazim Izzat
> <[email protected]>; Tang, Sieu Mun
> <[email protected]>; Lim, Jit Loon <[email protected]>; Chin
> Liang See <[email protected]>
> Subject: [PATCH] arch: arm: mach-socfpga: To notify SDM when U-Boot pass
> control to Linux
> 
> From: Chin Liang See <[email protected]>
> 
> Prior U-Boot pass control to Linux, U-Boot will send a mailbox command
> "HPS_STAGE_NOTIFY" to notify Secure Device Manager (SDM) on HPS SW
> transition.
> 
> Signed-off-by: Chin Liang See <[email protected]>
> Signed-off-by: Jit Loon Lim <[email protected]>
> ---
>  arch/arm/mach-socfpga/misc_soc64.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/arch/arm/mach-socfpga/misc_soc64.c b/arch/arm/mach-
> socfpga/misc_soc64.c
> index 2acdfad07b..00852d27d9 100644
> --- a/arch/arm/mach-socfpga/misc_soc64.c
> +++ b/arch/arm/mach-socfpga/misc_soc64.c
> @@ -89,3 +89,8 @@ void do_bridge_reset(int enable, unsigned int mask)
> 
>       socfpga_bridges_reset(enable);
>  }
> +
> +void arch_preboot_os(void)
> +{
> +     mbox_hps_stage_notify(HPS_EXECUTION_STATE_OS);

I don't see this function in https://source.denx.de/u-boot/u-boot, you need to 
submit the patch for this function first.

> +}
> --
> 2.26.2

Best regards,
TF.

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