From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
Date: Sat, 25 Jun 2016 21:04:42 +0200
Subject: [U-Boot] [PATCH v7 3/9] armv8: Add Secure Monitor/Hypervisor
 Call (SMC/HVC) infrastructure
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Hi Dirk,

On 23.06.2016 13:33, Dirk Behme wrote:
[...]
>>>>
>>>> Idea: perhaps after this series is merged we can add 2 new commands to u-boot (SMC/HVC) to
>>>> play with hypervisors/secure monitors (and perhaps use some simple functionality if needed).
>>>
>>> How this should look like?
>>
>> I thought of something like this (I did such code few times):
>>
>> u-boot> smc 42 42 42 42 42 42
>> ret => (0x1, 0x2, 0x3, 0x4)
> 
> 
> Could you share any (example?) code you have for such an smc/hvc U-Boot command?

I'm afraid I don't have it anymore :(

SMC call itself is trivial, you can use smc_call @ u-boot:
arch/arm/cpu/armv8/fwcall.c
(this is code for armv8 in 64-bit mode, but you can easily port it to armv7)

As for adding custom commands - just use any existing as template (sleep may be a good idea :) ).

Regards,
Mateusz