Syscon Cb100 Manual

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Syscon is the main power controller chip of the PS3. It is responsible for powering up the various power systems and for configuring and initialising the CELL BE, RSX and South Bridge. It communicates with these devices via separate SPI busses. There is external access by JTAG (disabled from factory on retail models), an EEPROM programming interface and Serial (UART). The Syscon is a SoC and consists of an ARM7TDMI (ARMv4) CPU, a 256KB EEPROM and 16KB RAM.

• 1Serialnumbers per SKU
• 2Syscon Externalised Ports
  • 2.1Syscon UART packets
  • 2.2Syscon UART
• 3Syscon underlying ports

Retail[edit]

Non retail[edit]

Not mentioned:

Note: for more specific information per model, see the links to each subpage in the Serialnumbers per SKU table.

Syscon UART packets[edit]

SCUART daemon (SCUARTD) packet structure[edit]

Syscon Cb100 Manual Pdf

SCUARTD packets includes header of 0x3 bytes and optional payload (depending on the command).

Packet IDs are not important, they are used only by clients and processed by SCUART daemon. SCUART daemon opens terminal file /dev/ttyS0 and use it to send commands and receive responses.

Packets[edit]

Packets Logs[edit]

Notes[edit]

• Some commands are unavailable on earlier firmwares, for example, tmpforcp is only supported on 1.3.3+.
• Some commands are divided into several strings, the first part (if exists) describes a command group, the second part describes the actual command and other parts describes command arguments.
• Real syscon commands have an ASCII form (a bold text in the 2nd column) instead of bytes above.
• Packet with ID *0x03* notifies syscon and calls SX program (based on ZMODEM protocol) to send firmware, syscon have custom or original implementation of RX program to receive firmware. An implementation of ZMODEM protocol used by Sony: http://oss.sony.net/Products/Linux/Others/Download/DECR-1000/mips_fp_le-lrzsz-0.12.20-devtool.1.src.rpm

A start of syscon's update procedure:

• A CP development tool includes several scripts which are participated in syscon update procedure. It starts after a CP update via update_syscon.pl perl script.
• This script checks the current syscon's firmware version. If it is in mask rom then it skips an update procedure, if not it checks major/minor/release parts of both versions and if a new version is applicable then it launches scfirmup utility and pass the firmware file path as an argument.
• scfirmup is a stupid tool which prepares a connection to SCUARTD and sends an update packet with a file path inside it. There is no need to comment it, here is reimplementation: http://pastie.org/private/6h8mfeoics4mdxear7ayg

Syscon Cb100 Manual Diagram

A syscon's update operation in SCUARTD consists of following steps:

• 1. Check if SX program presents in /usr/bin/sx. It should be a regular file.
• 2. Check if specified firmware file is a regular file.
• 3. Halt syscon by sending command halt to UART, then wait some time until it prints HALT: OK.
• 4. Reset syscon by sending byte 0x30 to GPIO register SC_PI0_DIPSW, byte 0x30 to GPIO register SC_RSTX, waiting 1 second and writing byte 0x31 to GPIO register SC_RSTX.
• 5. Get current syscon's firmwave version by sending command version to UART. After receiving it, look for a character after the first _ (underscore) symbol from the left side of string and if it equals to the character b, then proceed to the next step, otherwise go to the (8) step. (It is possible to patch this step to allow upgrading or downgrading at will)
• 6. Prepare syscon for an update by sending command firmud to UART, then fork the current process; the current process won't finish until a message Done from UART arrives (it is the end of update operation).
• 7. In the forked process start SX program and pass firmware file path to it. SX program reads firmware file and transfer each chunk of it to syscon.
• 8. After successful update operation reset syscon (a different way) by sending byte 0x31 to GPIO register SC_PI0_DIPSW, byte 0x30 to GPIO register SC_RSTX, waiting 1 second and writing byte 0x31 to GPIO register SC_RSTX.

Notes:

• It seems all scuartds checks firmware revision and probably syscon is updated only once (after factory).
• To be able to reflash it you need to patch SCUARTD or do a manual update without the use of SCUARTD.
• You need to patch a single byte in SCUARTD to be able to flash any firmware (for example, to downgrade your syscon).

• An actual firmware update process (without halting and resetting steps) takes about 1 minute.
• You cannot install a corrupted firmware with scfirmup unless you corrupt the header! It seems there is a hash of sorts (possibly of the plaintext) in the header preventing scfirmup from installing something corrupt
• Updating SYSCON requires the DECR to be in standby mode! You cannot update it while it is on.
• Corrupting the header and the body will make firmup install the SYSCON update anyways! be careful not to do it!
• Should you brick SYSCON, here's a patch to 'unbrick' it, do not use it unless you brick it though!

• You can use this bruteforcer to try your luck when finding new packets: https://hastebin.com/vomogesaru.cpp

Syscon UART[edit]

You can attach a 3.3v TTL cable (LV-TTL) to the UART on syscon (UART0_TxD, UART0_RxD). (Convenient solder points are available on JSD-001 / JTP-001 by the NOR test points. They are marked as '?' in marcan' noraliser / judges' NORway install picture, closest to the ground at the bottom - RX is left, TX is right) Baud rate is 57600. There is a simple plaintext protocol involved. This varies on different syscon models. Example:

<command>:<hash>

Where the hash is the sum of command bytes & 0xFF.

You should terminate commands with rn, the syscon messages are only terminated with n.

Samples[edit]

Here are some of the commands/messages encountered:

Messages:

Commands:

See also Syscon commands.

Bruteforcing commands: http://pastebin.com/CNei0xbC

VERY IMPORTANT:

• Max size of a command is 11 characters, 16 if you count with C:<hash>:
• Sending a command with 11 chars results in NO OUTPUT
• Sending a command with more than 11 chars results in NG F0000002
• Max size of a command on DECR is 135, 140 if you count with C:<hash>:

Syscon EEPROM (SPI)[edit]

Syscon JTAG[edit]

It is disabled in factory after production on retail models.

Syscon Cell SPI Bus[edit]

Syscon Southbridge SPI Bus[edit]

Syscon Cb100 Manual User

Syscon Cb100 Manual Transmission