Man page - vcmailbox(1)

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Manual

VCMAILBOX(1) General Commands Manual VCMAILBOX(1)

vcmailbox - send messages to the VideoCore via the mailbox

vcmailbox [word0] [word1] ...

vcmailbox is a low-level utility for sending mailbox messages to the VideoCore. See [MAILBOX] or vcmailbox(7) for more information on the available messages and their respective formats. and raspiotp(7) for some examples of typical usage.

vcgencmd(1), raspiotp(7), [MAILBOX]

[MAILBOX]
https://github.com/raspberrypi/firmware/wiki/Mailbox-property-interface