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This page is a stub for completion by someone who knows more than I about the subject.
Mailboxes facilitate communication between the ARM and the VideoCore. This page lists the available mailboxes/channels.
The following lists the currently defined mailbox channels, with links to pages describing the format of the messages.
Mailbox 0 defines the following channels:
0: Power management
2: Virtual UART
6: Touch screen
8: Property tags (ARM -> VC)
9: Property tags (VC -> ARM)
The following table shows the register offsets for the different mailboxes. For a description of the procedure for using these registers to access a mailbox, see here.
Mailbox Peek Read Write Status Sender Config
0 0x10 0x00 0x20 0x18 0x14 0x1C