Implement write support for Security OTP values via mailbox API commands
MBOX_CMD_OTP_WRITE_32B and MBOX_CMD_OTP_WRITE.
Write support for North and South Bridge OTPs are not implemented as these
OTPs are already burned in factory with some data.
Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Marek Behún <marek.behun@nic.cz>
It is not possible for the A53 core (on which U-Boot is running) to read it
directly. For this purpose Marvell defined mbox API for sending OTP
commands between CM3 and A53 cores.
Implement these Marvell fuse reading mbox commands via U-Boot fuse API.
Banks 0-43 are used for accessing Security OTP (44 rows with 67 bits via 44
banks and words 0-2).
Note that of the 67 bits, the 3 upper bits are: 1 lock bit and 2
auxiliary bits (meant for testing during the manufacture of the SOC, as
I understand it).
Also note that the lock bit and the auxiliary bits are not readable
via Marvell commands.
With CZ.NIC's commands the lock bit is readable.
Write support is not implemented yet.
Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>
Implement reading NB and SB fuses of Armada 37xx SOC via U-Boot fuse API.
Banks 0-43 are reserved for accessing Security OTP (not implemented yet).
Bank 44 is used for accessing North Bridge OTP (69 bits via words 0-2).
Bank 45 is used for accessing South Bridge OTP (97 bits via words 0-3).
Write support is not implemented yet because it looks like that both North
and South Bridge OTPs are already burned in factory with some data. The
meaning of some bits of North Bridge is documented in WTMI source code.
The meaning of bits in South Bridge is unknown.
Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>
