Ernie

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Ernie is the codename for the Syscon chip. The Syscon is for exemple responsible for handling button input (including power button), reading/writing to non-volatile storage (NVS) for storing system flags (mostly encrypted and signed). For example IDU flag is stored in NVS. Syscon is also responsible for maintaining the physical address to the resume buffer during Suspend. Communication between Kermit and Syscon is mainly through SPI (see SceSyscon) but there are also some GPIO pins connecting the two. The chip model is NEC/Renesas uPD79F0109 and is likely custom designed for Sony.

See also: Ernie Secure

Boot Process

The following is logged from boot. The timestamp is in seconds (the starting time is irrelevant). The arrow at the start indicates direction: '>' means Kermit to Syscon (MOSI) and '<' means Syscon to Kermit (MISO). Then there is a 2 byte command id or response code, followed by a flag byte (response only), the payload, a checksum byte, and an (response only) unknown byte. Please note that the packets are listed in transfer order but this may not represent the logical order of the packets. It is currently unknown what the logical order should be, but one can guess that a response is "close to" a request.

First some version information seems to be sent from Syscon to Kermit. This is same for cold boot and resume boot. The last response indicates the type of boot where 0xFF80 is resume and 0xFF14 is regular boot. 

< [2.048118000000000] 0x0004, flags=00, payload=[0D 06 00 01 | ....], chk=0xE1, unk=0x00
> [2.048118000000000] 0x0001, payload=[ | ], chk=0xFD
< [2.048659583333333] 0x0004, flags=00, payload=[00 60 40 00 | .`@.], chk=0x55, unk=0x00
> [2.048659583333333] 0x0005, payload=[ | ], chk=0xF9
< [2.049330083333333] 0x0004, flags=00, payload=[32 30 31 32 31 31 30 38 31 37 30 34 | 201211081704], chk=0x92, unk=0x00
> [2.049330083333333] 0x0002, payload=[ | ], chk=0xFC
< [2.054004333333333] 0x0004, flags=80, payload=[ | ], chk=0x79, unk=0x30
> [2.054004333333333] 0x0080, payload=[12 00 | ..], chk=0x6A
< [2.058172916666666] 0x0024, flags=00, payload=[ | ], chk=0xD9, unk=0x30
> [2.058172916666666] 0x0000, payload=[ | ], chk=0xFE
< [2.062716333333333] 0x0024, flags=00, payload=[ | ], chk=0xD9, unk=0x30
> [2.062716333333333] 0x0080, payload=[12 00 | ..], chk=0x6A
< [2.111457750000000] 0x0004, flags=00, payload=[14 FF | ..], chk=0xE4, unk=0x32

Next some encrypted session is established. A 8 byte nonce is sent from Syscon (it appears random for each boot, cold or warm). Encrypted data from this point on always differs each boot. 

> [2.111457750000000] 0x0010, payload=[ | ], chk=0xEE
< [2.133389000000000] 0x0004, flags=80, payload=[ | ], chk=0x79, unk=0xFF
> [2.133389000000000] 0x00A0, payload=[30 00 00 0B 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 | 0.......................................], chk=0xFB
< [2.150567250000000] 0x0024, flags=00, payload=[ | ], chk=0xD9, unk=0xFF
> [2.150567250000000] 0x0000, payload=[ | ], chk=0xFE
< [2.155149500000000] 0x0024, flags=00, payload=[30 01 00 0B 00 00 00 00 A4 B0 EF 23 D6 9A 3A 06 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 | 0..........#..:.........................], chk=0x5F, unk=0x00
> [2.155149500000000] 0x00A0, payload=[30 00 00 0B 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 | 0.......................................], chk=0xFB
< [2.163572000000000] 0x0004, flags=80, payload=[ | ], chk=0x79, unk=0x01
> [2.163572000000000] 0x00A0, payload=[30 02 00 0B 01 00 00 00 6C 7F E0 79 AA 03 4B B0 96 B7 42 F0 BC F8 62 7A 35 27 53 68 3D 0D ED A7 13 F2 32 77 46 2D 54 F8 | 0.......l..y..K...B...bz5'Sh=.....2wF-T.], chk=0x9B
< [2.189271166666667] 0x0024, flags=00, payload=[ | ], chk=0xD9, unk=0x01
> [2.189271166666667] 0x0000, payload=[ | ], chk=0xFE
< [2.193866583333334] 0x0024, flags=00, payload=[30 03 00 0B 00 00 00 00 7A 44 6E C8 F5 FA 35 CB 9B E9 E6 A0 B6 5C 85 1D FB A8 89 5C 9C 04 0B 29 34 59 55 EB 1D 98 AB 83 | 0.......zDn...5......\.....\...)4YU.....], chk=0xC6, unk=0x00
> [2.193866583333334] 0x00A0, payload=[30 02 00 0B 01 00 00 00 6C 7F E0 79 AA 03 4B B0 96 B7 42 F0 BC F8 62 7A 35 27 53 68 3D 0D ED A7 13 F2 32 77 46 2D 54 F8 | 0.......l..y..K...B...bz5'Sh=.....2wF-T.], chk=0x9B

Some more data is exchanged. Up until this point all the plaintext payloads appear to be the same from coldboot and warmboot. 

< [2.202246333333334] 0x0004, flags=80, payload=[ | ], chk=0x79, unk=0x03
> [2.202246333333334] 0x088E, payload=[01 22 | ."], chk=0x43
< [2.206411750000000] 0x0004, flags=00, payload=[ | ], chk=0xF9, unk=0x03
> [2.206411750000000] 0x0000, payload=[ | ], chk=0xFE
< [2.217062666666667] 0x0024, flags=00, payload=[ | ], chk=0xD9, unk=0x03
> [2.217062666666667] 0x0000, payload=[ | ], chk=0xFE
< [2.221620916666667] 0x0024, flags=00, payload=[ | ], chk=0xD9, unk=0x03
> [2.221620916666667] 0x088E, payload=[01 22 | ."], chk=0x43
< [2.229805500000000] 0x0004, flags=80, payload=[ | ], chk=0x79, unk=0x03
> [2.229805500000000] 0x1082, payload=[80 04 08 | ...], chk=0xDD
< [2.233887583333333] 0x0024, flags=00, payload=[ | ], chk=0xD9, unk=0x03
> [2.233887583333333] 0x0000, payload=[ | ], chk=0xFE
< [2.238363416666667] 0x0024, flags=00, payload=[FF FF FF FF 01 FF FF FF | ........], chk=0xD7, unk=0x44
> [2.238363416666667] 0x1082, payload=[80 04 08 | ...], chk=0xDD
< [2.246473916666667] 0x0004, flags=80, payload=[ | ], chk=0x79, unk=0xFF

Now, there appears to be a branch. The next sequence only shows up for cold boots. 

> [2.246473916666667] 0x1082, payload=[A0 04 01 | ...], chk=0xC4
< [2.250555000000000] 0x0024, flags=00, payload=[ | ], chk=0xD9, unk=0xFF
> [2.250555000000000] 0x0000, payload=[ | ], chk=0xFE
< [2.255030833333334] 0x0024, flags=00, payload=[FF | .], chk=0xD9, unk=0x00
> [2.255030833333334] 0x1082, payload=[A0 04 01 | ...], chk=0xC4
< [2.259176583333333] 0x0004, flags=00, payload=[01 01 13 00 | ....], chk=0xE0, unk=0xFF
> [2.259176583333333] 0x1100, payload=[ | ], chk=0xED
< [2.263720583333333] 0x0004, flags=80, payload=[ | ], chk=0x79, unk=0x01
> [2.263720583333333] 0x00D0, payload=[30 00 00 0F 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 | 0.......................................], chk=0xC7
< [2.267827000000000] 0x0004, flags=00, payload=[ | ], chk=0xF9, unk=0x01
> [2.267827000000000] 0x0000, payload=[ | ], chk=0xFE
< [2.278339666666667] 0x0024, flags=00, payload=[ | ], chk=0xD9, unk=0x01
> [2.278339666666667] 0x0000, payload=[ | ], chk=0xFE
< [2.282830833333333] 0x0024, flags=00, payload=[30 01 00 0F 00 00 00 00 E1 CA 65 96 BB 7E 81 7A 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 | 0.........e..~.z........................], chk=0x97, unk=0x00
> [2.282830833333333] 0x00D0, payload=[30 00 00 0F 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 | 0.......................................], chk=0xC7
< [2.291023500000000] 0x0004, flags=80, payload=[ | ], chk=0x79, unk=0x01
> [2.291023500000000] 0x00D0, payload=[30 02 00 0F 01 00 00 00 4E D7 C0 7C D5 E8 BB D7 3E 9E 43 7B B2 E3 4D 81 23 C8 C4 BF B8 4D 9B 25 0A 3D C7 45 E6 0D 23 43 | 0.......N..|....>.C{..M.#....M.%.=.E..#C], chk=0x38
< [2.295129250000000] 0x0004, flags=00, payload=[ | ], chk=0xF9, unk=0x01
> [2.295129250000000] 0x0000, payload=[ | ], chk=0xFE
< [2.305641750000000] 0x0024, flags=00, payload=[ | ], chk=0xD9, unk=0x01
> [2.305641750000000] 0x0000, payload=[ | ], chk=0xFE
< [2.310132916666667] 0x0024, flags=00, payload=[30 03 00 0F 00 00 00 00 5B 3E 5C 5F 11 F9 E4 6A 85 0D 1E 06 9E F9 33 25 9B 95 55 21 39 48 FC 55 C7 BF A7 E4 32 AD FC 65 | 0.......[>\_...j......3%..U!9H.U....2..e], chk=0x55, unk=0x00
> [2.310132916666667] 0x00D0, payload=[30 02 00 0F 01 00 00 00 4E D7 C0 7C D5 E8 BB D7 3E 9E 43 7B B2 E3 4D 81 23 C8 C4 BF B8 4D 9B 25 0A 3D C7 45 E6 0D 23 43 | 0.......N..|....>.C{..M.#....M.%.=.E..#C], chk=0x38
< [2.318358166666667] 0x0004, flags=80, payload=[ | ], chk=0x79, unk=0x03
> [2.318358166666667] 0x00D0, payload=[30 04 00 0F 00 00 00 00 52 8D 6D BC 90 C9 00 EE FA CA 47 63 10 D1 4A E5 5A FD BB 91 3A 6C DA EF 64 CA 71 01 4A A9 D5 31 | 0.......R.m.......Gc..J.Z...:l..d.q.J..1], chk=0x4B
< [2.322464250000000] 0x0004, flags=00, payload=[ | ], chk=0xF9, unk=0x03
> [2.322464250000000] 0x0000, payload=[ | ], chk=0xFE
< [2.332976833333333] 0x0024, flags=00, payload=[ | ], chk=0xD9, unk=0x03
> [2.332976833333333] 0x0000, payload=[ | ], chk=0xFE
< [2.337468000000000] 0x0024, flags=00, payload=[30 05 00 0F 00 00 00 00 52 8D 6D BC 90 C9 00 EE FA CA 47 63 10 D1 4A E5 5A FD BB 91 3A 6C DA EF 64 CA 71 01 4A A9 D5 31 | 0.......R.m.......Gc..J.Z...:l..d.q.J..1], chk=0xF5, unk=0x00
> [2.337468000000000] 0x00D0, payload=[30 04 00 0F 00 00 00 00 52 8D 6D BC 90 C9 00 EE FA CA 47 63 10 D1 4A E5 5A FD BB 91 3A 6C DA EF 64 CA 71 01 4A A9 D5 31 | 0.......R.m.......Gc..J.Z...:l..d.q.J..1], chk=0x4B
< [2.345696333333333] 0x0004, flags=80, payload=[ | ], chk=0x79, unk=0x05

Then another set of shared sequence. Some differences in the warmboot responses though. On line 18, 

FF BF FF 74

becomes 

FF FF FF 74

. On line 12, the 

00 00 00 00

becomes the address of the resume buffer (ex 

F0 1E 1F 41

). 

> [2.345696333333333] 0x00D2, payload=[20 7A 3E 7B 31 DE FC 3A 11 5F 64 E7 AB A4 EC 17 | .z>{1..:._d.....], chk=0x77
< [2.349790333333333] 0x0004, flags=00, payload=[ | ], chk=0xF9, unk=0x05
> [2.349790333333333] 0x0000, payload=[ | ], chk=0xFE
< [2.360448916666666] 0x0024, flags=00, payload=[ | ], chk=0xD9, unk=0x05
> [2.360448916666666] 0x0000, payload=[ | ], chk=0xFE
< [2.364930250000000] 0x0024, flags=00, payload=[9D 0B BC 4D BA 66 40 2C 63 BE F3 79 D0 31 26 1E 47 3A 64 DE 68 2F AE E2 8A B6 F0 27 37 46 89 16 0E 71 04 FA BF C9 4A A1 DF 4B EF D3 3D 0D 39 CD | ...M.f@,c..y.1&.G:d.h/.....'7F...q....J..K..=.9.], chk=0x11, unk=0x00
> [2.364930250000000] 0x00D2, payload=[20 7A 3E 7B 31 DE FC 3A 11 5F 64 E7 AB A4 EC 17 | .z>{1..:._d.....], chk=0x77
< [2.373236666666667] 0x0004, flags=80, payload=[ | ], chk=0x79, unk=0x0B
> [2.373236666666667] 0x0090, payload=[0C 00 04 | ...], chk=0x5B
< [2.377318583333333] 0x0024, flags=00, payload=[ | ], chk=0xD9, unk=0x0B
> [2.377318583333333] 0x0000, payload=[ | ], chk=0xFE
< [2.381794416666667] 0x0024, flags=00, payload=[00 00 00 00 | ....], chk=0xD5, unk=0x66
> [2.381794416666667] 0x0090, payload=[0C 00 04 | ...], chk=0x5B
< [2.385879750000000] 0x0004, flags=00, payload=[40 00 | @.], chk=0xB7, unk=0x00
> [2.385879750000000] 0x0800, payload=[ | ], chk=0xF6
< [2.386382583333333] 0x0004, flags=00, payload=[FF BF FF 74 | ...t], chk=0xC4, unk=0x66
> [2.386382583333333] 0x0100, payload=[ | ], chk=0xFD
< [2.386871833333333] 0x0004, flags=00, payload=[10 00 00 00 | ....], chk=0xE5, unk=0x66
> [2.386871833333333] 0x0003, payload=[ | ], chk=0xFB
< [2.387380083333333] 0x0000, flags=3F, payload=[ | ], chk=0xBE, unk=0x00
> [2.387380083333333] 0x0006, payload=[ | ], chk=0xF8
< [2.481997666666667] 0x0000, flags=80, payload=[ | ], chk=0x7D, unk=0x00
> [2.481986333333333] 0x00D2, payload=[30 14 F4 B8 84 89 81 AB 3D 07 66 DE AE B6 D3 24 | 0.......=.f....$], chk=0x10
< [2.514678500000000] 0x0020, flags=00, payload=[ | ], chk=0xDD, unk=0x00
> [2.514678500000000] 0x0000, payload=[ | ], chk=0xFE
< [2.519163916666667] 0x0020, flags=00, payload=[1A 1F BC 74 AA 16 59 D6 5C E7 FF 5B E0 85 B2 C8 39 2D D6 95 98 2F B7 4B 71 64 34 D7 8D 2C 94 A1 91 CB 73 D7 8D E1 D0 07 E6 1E 0F DA E7 51 BC 69 | ...t..Y.\..[....9-.../.Kqd4..,....s..........Q.i], chk=0x3C, unk=0x00
> [2.519163916666667] 0x00D2, payload=[30 14 F4 B8 84 89 81 AB 3D 07 66 DE AE B6 D3 24 | 0.......=.f....$], chk=0x10
< [2.527551416666667] 0x0000, flags=80, payload=[ | ], chk=0x7D, unk=0x1F
> [2.527540083333333] 0x088E, payload=[02 29 | .)], chk=0x3B
< [2.531619416666667] 0x0000, flags=00, payload=[ | ], chk=0xFD, unk=0x1F
> [2.531619416666667] 0x0000, payload=[ | ], chk=0xFE
< [2.542392416666666] 0x0020, flags=00, payload=[ | ], chk=0xDD, unk=0x1F
> [2.542392416666666] 0x0000, payload=[ | ], chk=0xFE
< [2.546867583333333] 0x0020, flags=00, payload=[ | ], chk=0xDD, unk=0x1F
> [2.546867583333333] 0x088E, payload=[02 29 | .)], chk=0x3B

Then, the two boot paths diverge completely (also note the time jump). It is suspected that at this point the kernel is started up on coldboot, and the kernel resumes for warmboot. For cold boot only, we see the beginning init sequence again, which is likely done in SceSyscon. 

< [3.322105750000000] 0x0000, flags=00, payload=[0D 06 00 01 | ....], chk=0xE5, unk=0x16
> [3.322105750000000] 0x0001, payload=[ | ], chk=0xFD
< [3.326563916666667] 0x0000, flags=00, payload=[32 30 31 32 31 31 30 38 31 37 30 34 | 201211081704], chk=0x96, unk=0x85
> [3.326552583333333] 0x0002, payload=[ | ], chk=0xFC
< [3.331090666666667] 0x0000, flags=80, payload=[ | ], chk=0x7D, unk=0x30
> [3.331079333333333] 0x0080, payload=[12 00 | ..], chk=0x6A
< [3.331576333333333] 0x0020, flags=00, payload=[ | ], chk=0xDD, unk=0x30
> [3.331576333333333] 0x0080, payload=[12 00 | ..], chk=0x6A
< [3.332068833333333] 0x0000, flags=00, payload=[10 00 00 00 | ....], chk=0xE9, unk=0x31
> [3.332068833333333] 0x0004, payload=[ | ], chk=0xFA
< [3.332541666666667] 0x0000, flags=00, payload=[00 FF 04 00 | ....], chk=0xF6, unk=0x31
> [3.332541666666667] 0x0103, payload=[ | ], chk=0xFA
< [3.336980333333333] 0x0000, flags=00, payload=[10 00 00 00 | ....], chk=0xE9, unk=0x31
> [3.336980333333333] 0x0003, payload=[ | ], chk=0xFB
...

Packet checksum

The checksum byte of the packet is calculated as the binary negation of the sum of all the bytes of the packet (including the 2 bytes of the command id and the byte for the length). The checksum calculation can be implemented as follows: 

void syscon_calc_checksum(unsigned char packet[32], int length)
{
	int i;
	unsigned char hash = 0;
	
	for (i = 0; i < 3 + length; i++)
		hash += packet[i];

	packet[3 + length] = ~hash;
}

Commands

Commands are listed in the order seen in cold boot. The numbers in the captured packets indicate the assumed order with some unused packets filtered out (they appear to be resent). The ordering and grouping are assumed and may contain errors.

CMD 0x0001

Gets some device specific version. Maybe chipset revision? Can also be seen in the packet header in Syscon Update. Also sent at kernel boot. 

SEND 1    > [2.881037083333333] 0x0001, payload=[ | ], chk=0xFD
RESP 1    < [2.881037083333333] 0x0004, flags=00, payload=[0D 06 00 01 | ....], chk=0xE1, unk=0x71

SEND 23   > [4.167151583333333] 0x0001, payload=[ | ], chk=0xFD
RESP 23   < [4.167151583333333] 0x0000, flags=00, payload=[0D 06 00 01 | ....], chk=0xE5, unk=0x32

CMD 0x0005 - GetHardwareInfo

See Sysroot#Hardware_Info. 

SEND 2    > [2.881578833333333] 0x0005, payload=[ | ], chk=0xF9
RESP 2    < [2.881578833333333] 0x0004, flags=00, payload=[00 60 40 00 | .`@.], chk=0x55, unk=0x71

CMD 0x0002

Gets syscon version string. Likely refers to hardware version. Also sent at kernel boot. 

SEND 3    > [2.882249083333333] 0x0002, payload=[ | ], chk=0xFC
RESP 3    < [2.882249083333333] 0x0004, flags=00, payload=[32 30 31 32 31 31 30 38 31 37 30 34 | 201211081704], chk=0x92, unk=0x00

SEND 24   > [4.171598000000000] 0x0002, payload=[ | ], chk=0xFC
RESP 24   < [4.171598000000000] 0x0000, flags=00, payload=[32 30 31 32 31 31 30 38 31 37 30 34 | 201211081704], chk=0x96, unk=0xF7

CMD 0x0080

Unknown. Sends data 0x0012 on 3.60. Does not get return data. Also sent at kernel boot. 

SEND 4    > [2.895635416666666] 0x0080, payload=[12 00 | ..], chk=0x6A
RESP 4    < [2.886923416666667] 0x0004, flags=80, payload=[ | ], chk=0x79, unk=0x30
RESP 4    < [2.891092083333333] 0x0024, flags=00, payload=[ | ], chk=0xD9, unk=0x30
RESP 4    < [2.895635416666666] 0x0024, flags=00, payload=[ | ], chk=0xD9, unk=0x30

SEND 25   > [4.176620750000000] 0x0080, payload=[12 00 | ..], chk=0x6A
RESP 25   < [4.176123750000000] 0x0000, flags=80, payload=[ | ], chk=0x7D, unk=0x30
RESP 25   < [4.176620750000000] 0x0020, flags=00, payload=[ | ], chk=0xDD, unk=0x30

CMD 0x0010 - GetWakeupFactor

See Wakeup factor.

Boot type indicator. 0xFF14 on cold boot. 0xFF80 on resume boot. 

SEND 5    > [2.950546416666667] 0x0010, payload=[ | ], chk=0xEE
RESP 5    < [2.950546416666667] 0x0004, flags=00, payload=[14 FF | ..], chk=0xE4, unk=0x32

CMD 0x00A0

Runs twice. Appears to contain a 8 byte inner header. First packet sends all zeros and gets back a 8 byte random response. This is likely a nonce or challenge. This likely establishes an encrypted session. Encrypted data differs on each boot. There does not appear to be data transferred using the established session. 

SEND 6    > [2.994470666666667] 0x00A0, payload=[30 00 00 0B 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 | 0.......................................], chk=0xFB
RESP 6    < [2.972471333333333] 0x0004, flags=80, payload=[ | ], chk=0x79, unk=0xFF
RESP 6    < [2.989889500000000] 0x0024, flags=00, payload=[ | ], chk=0xD9, unk=0xFF
RESP 6    < [2.994470666666667] 0x0024, flags=00, payload=[30 01 00 0B 00 00 00 00 CA 71 11 BA 86 87 EF 0D 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 | 0........q..............................], chk=0x66, unk=0x00

SEND 7    > [3.033187750000000] 0x00A0, payload=[30 02 00 0B 01 00 00 00 92 45 B4 A5 49 15 CE F2 39 0E 9E 4C BF FA 19 E6 5D CF BA 5A 6E C3 7C ED 2A 6D 4E 79 84 28 1C 2A | 0........E..I...9..L....]..Zn.|.*mNy.(.*], chk=0x97
RESP 7    < [3.002893083333333] 0x0004, flags=80, payload=[ | ], chk=0x79, unk=0x01
RESP 7    < [3.028592333333334] 0x0024, flags=00, payload=[ | ], chk=0xD9, unk=0x01
RESP 7    < [3.033187750000000] 0x0024, flags=00, payload=[30 03 00 0B 00 00 00 00 12 77 A5 98 67 F7 38 9B B4 54 48 FE 84 82 CF 84 41 42 87 A2 EA D1 CF 9C 5B D1 2A 3F 1E 50 B9 3D | 0........w..g.8..TH.....AB......[.*?.P.=], chk=0x0A, unk=0x00

CMD 0x088E

Unknown. Sends data 0x2201 on 3.60 and does not get a response. 

SEND 8    > [3.061354583333333] 0x088E, payload=[01 22 | ."], chk=0x43
RESP 8    < [3.041713500000000] 0x0004, flags=80, payload=[ | ], chk=0x79, unk=0x03
RESP 8    < [3.046148250000000] 0x0004, flags=00, payload=[ | ], chk=0xF9, unk=0x03
RESP 8    < [3.056796250000000] 0x0024, flags=00, payload=[ | ], chk=0xD9, unk=0x03
RESP 8    < [3.061354583333333] 0x0024, flags=00, payload=[ | ], chk=0xD9, unk=0x03

CMD 0x1082 - NVS Read

Get data from NVS. 2-byte offset followed by 1 byte length. For example used to fetch boot-time flags, like Update Mode.

See SceSblSsMgr#NVS_Areas. 

Get Qaf Token area:
SEND 9    > [3.078212500000000] 0x1082, payload=[80 04 08 | ...], chk=0xDD
RESP 9    < [3.069790250000000] 0x0004, flags=80, payload=[ | ], chk=0x79, unk=0x03
RESP 9    < [3.073736583333333] 0x0024, flags=00, payload=[ | ], chk=0xD9, unk=0x03
RESP 9    < [3.078212500000000] 0x0024, flags=00, payload=[FF FF FF FF 01 FF FF FF | ........], chk=0xD7, unk=0x77

Get Update Mode:
SEND 10   > [3.094879833333333] 0x1082, payload=[A0 04 01 | ...], chk=0xC4
RESP 10   < [3.086322916666667] 0x0004, flags=80, payload=[ | ], chk=0x79, unk=0xFF
RESP 10   < [3.090404000000000] 0x0024, flags=00, payload=[ | ], chk=0xD9, unk=0xFF
RESP 10   < [3.094879833333333] 0x0024, flags=00, payload=[FF | .], chk=0xD9, unk=0x00

CMD 0x1100 - GetErnieDLVersion

Gets Ernie DownLoader Version i.e. version of Ernie firmware. 

SEND 11   > [3.099025500000000] 0x1100, payload=[ | ], chk=0xED
RESP 11   < [3.099025500000000] 0x0004, flags=00, payload=[01 01 13 00 | ....], chk=0xE0, unk=0xFF

CMD 0x00D0

Some encrypted transfer that looks close to Syscon#CMD 0x00A0 in format. Different on each boot. 

SEND 12   > [3.122679833333333] 0x00D0, payload=[30 00 00 0F 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 | 0.......................................], chk=0xC7
RESP 12   < [3.103569583333333] 0x0004, flags=80, payload=[ | ], chk=0x79, unk=0x01
RESP 12   < [3.107676166666667] 0x0004, flags=00, payload=[ | ], chk=0xF9, unk=0x01
RESP 12   < [3.118188666666667] 0x0024, flags=00, payload=[ | ], chk=0xD9, unk=0x01
RESP 12   < [3.122679833333333] 0x0024, flags=00, payload=[30 01 00 0F 00 00 00 00 9F CC 4A 69 73 E9 C0 5A 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 | 0.........Jis..Z........................], chk=0xDD, unk=0x00

SEND 13   > [3.150031916666667] 0x00D0, payload=[30 02 00 0F 01 00 00 00 98 6D 3A 1E C5 B1 E9 AF 54 65 55 91 3B DF 2B A8 0F AD B0 73 A0 A2 0F EE 5D 0A AF 41 A5 6D 32 20 | 0........m:.....TeU.;.+....s....]..A.m2.], chk=0xF4
RESP 13   < [3.130872500000000] 0x0004, flags=80, payload=[ | ], chk=0x79, unk=0x01
RESP 13   < [3.134978166666667] 0x0004, flags=00, payload=[ | ], chk=0xF9, unk=0x01
RESP 13   < [3.145539833333333] 0x0024, flags=00, payload=[ | ], chk=0xD9, unk=0x01
RESP 13   < [3.150031916666667] 0x0024, flags=00, payload=[30 03 00 0F 00 00 00 00 F5 19 C0 67 09 80 C6 DB 58 8D FB E1 86 22 D1 00 DA BB D2 AF AA 51 F9 57 7C 56 92 0A 94 D6 60 4D | 0..........g....X....".......Q.W|V....`M], chk=0xF0, unk=0x00

SEND 14   > [3.177452416666667] 0x00D0, payload=[30 04 00 0F 00 00 00 00 87 4E 59 41 22 98 F8 62 BD B4 C8 4F 4C 0A 81 90 47 1E 1E 70 D6 51 57 42 E5 EC 07 A2 D4 CF E5 02 | 0........NYA"..b...OL...G..p.QWB........], chk=0x9A
RESP 14   < [3.158257166666667] 0x0004, flags=80, payload=[ | ], chk=0x79, unk=0x03
RESP 14   < [3.162363250000000] 0x0004, flags=00, payload=[ | ], chk=0xF9, unk=0x03
RESP 14   < [3.172875666666667] 0x0024, flags=00, payload=[ | ], chk=0xD9, unk=0x03
RESP 14   < [3.177452416666667] 0x0024, flags=00, payload=[30 05 00 0F 00 00 00 00 87 4E 59 41 22 98 F8 62 BD B4 C8 4F 4C 0A 81 90 47 1E 1E 70 D6 51 57 42 E5 EC 07 A2 D4 CF E5 02 | 0........NYA"..b...OL...G..p.QWB........], chk=0x44, unk=0x00

CMD 0x00D2 - SNVS RW

This command is used twice during boot and also quite often after boot. Data is different on each boot. Encrypted session using key from handshake above. Second transaction seems to be the firmware version data written during the update process. Likely firmware version check is done here. 

SEND 15   > [3.204733083333333] 0x00D2, payload=[32 78 88 CF 3E 63 56 19 75 3A 0A 2D F3 49 63 E2 | 2x..>cV.u:.-.Ic.], chk=0xA4
RESP 15   < [3.185595250000000] 0x0004, flags=80, payload=[ | ], chk=0x79, unk=0x05
RESP 15   < [3.189740333333333] 0x0004, flags=00, payload=[ | ], chk=0xF9, unk=0x05
RESP 15   < [3.200251666666666] 0x0024, flags=00, payload=[ | ], chk=0xD9, unk=0x05
RESP 15   < [3.204733083333333] 0x0024, flags=00, payload=[D3 57 9B F2 A2 45 E2 7A 2A FC 84 12 97 8E 23 5F C8 AB FB 58 97 EC DE 20 94 0A 78 28 C6 EE C5 45 18 29 00 F4 56 22 53 AF 24 47 8E FF B1 5C DA 2F | .W...E.z*.....#_...X......x(...E.)..V"S.$G...\./], chk=0x4C, unk=0xFF

SEND 21   > [3.359112250000000] 0x00D2, payload=[1C 0B 9E FF FB 68 90 4B FD C2 05 CD D8 67 4D D0 | .....h.K.....gM.], chk=0x2D
RESP 21   < [3.321934500000000] 0x0000, flags=80, payload=[ | ], chk=0x7D, unk=0x00
RESP 21   < [3.354626666666667] 0x0020, flags=00, payload=[ | ], chk=0xDD, unk=0x00
RESP 21   < [3.359112250000000] 0x0020, flags=00, payload=[6C B4 26 F3 CD 32 D3 3E 6F 80 F2 0F 68 F7 E2 96 58 DB 2F BB AB A6 98 DD 26 14 DD 61 12 E4 55 BA BB 32 1D 1F 75 D5 D1 4C 7E 4A 19 42 E5 B0 C6 AB | l.&..2.>o...h...X./.....&..a..U..2..u..L~J.B....], chk=0x84, unk=0xFF

CMD 0x0090 - VS Read

This command reads data from Ernie Volatile Storage. This is the inverse of command 0x91.

This is used for example to fetch the saved resume context buffer physical address. Kernel sets this before suspending and this value is passed to the resume function. See Suspend. The format is 2 byte offset and 1 byte length. 

SEND 16   > [3.221743166666667] 0x0090, payload=[0C 00 04 | ...], chk=0x5B
RESP 16   < [3.213273166666667] 0x0004, flags=80, payload=[ | ], chk=0x79, unk=0x57
RESP 16   < [3.217267333333333] 0x0024, flags=00, payload=[ | ], chk=0xD9, unk=0x57
RESP 16   < [3.221743166666667] 0x0024, flags=00, payload=[F0 0E 1F 41 | ...A], chk=0x77, unk=0x45

CMD 0x0091 - VS Write

This command writes data to Ernie Volatile Storage. This is the inverse of command 0x90.

CMD 0x0800

Unknown. 

SEND 17   > [3.225828583333334] 0x0800, payload=[ | ], chk=0xF6
RESP 17   < [3.225828583333334] 0x0004, flags=00, payload=[40 00 | @.], chk=0xB7, unk=0x41

CMD 0x0100 - GetBootControlsInfo

See Boot Controls Info. 

SEND 18   > [3.226331500000000] 0x0100, payload=[ | ], chk=0xFD
RESP 18   < [3.226331500000000] 0x0004, flags=00, payload=[FF BF FF 74 | ...t], chk=0xC4, unk=0x45

CMD 0x0003 - GetSleepFactor

See Sleep Factor. 

SEND 19   > [3.226820750000000] 0x0003, payload=[ | ], chk=0xFB
RESP 19   < [3.226820750000000] 0x0004, flags=00, payload=[10 00 00 00 | ....], chk=0xE5, unk=0x45

CMD 0x0006 - Get Hardware flags

See Hardware flags. 

SEND 20   > [3.227328833333333] 0x0006, payload=[ | ], chk=0xF8
RESP 20   < [3.227328833333333] 0x0000, flags=3F, payload=[ | ], chk=0xBE, unk=0x00

CMD 0x088E

Unknown. Appears to be the last command sent before a time-jump (likely indicating completion of early-boot). Might be some status indicator to tell Syscon that we're done. 

SEND 22   > [3.386554833333333] 0x088E, payload=[02 29 | .)], chk=0x3B
RESP 22   < [3.367488416666667] 0x0000, flags=80, payload=[ | ], chk=0x7D, unk=0xB4
RESP 22   < [3.371567833333333] 0x0000, flags=00, payload=[ | ], chk=0xFD, unk=0xB4
RESP 22   < [3.382079833333334] 0x0020, flags=00, payload=[ | ], chk=0xDD, unk=0xB4
RESP 22   < [3.386554833333333] 0x0020, flags=00, payload=[ | ], chk=0xDD, unk=0xB4

CMD 0x0004

Unknown. Likely happens after initial boot. 

SEND 26   > [4.177113250000000] 0x0004, payload=[ | ], chk=0xFA
RESP 26   < [4.177113250000000] 0x0000, flags=00, payload=[10 00 00 00 | ....], chk=0xE9, unk=0x31

CMD 0x0103

Unknown. Likely happens after initial boot. 

SEND 27   > [4.177586083333333] 0x0103, payload=[ | ], chk=0xFA
RESP 27   < [4.177586083333333] 0x0000, flags=00, payload=[00 FF 04 00 | ....], chk=0xF6, unk=0x31

NVS

Not every NVS sector is directly readable from non-secure kernel: some sectors are part of SNVS (Secure NVS) which means they are XTS encrypted and must be accessed through a Secure handshake.

On FW 3.60, NVS size is 0xB60 bytes:

  • Area from 0 to 0x3FF cannot be read using sceSblSsNvsReadForKernel nor written using sceSblSsNvsWriteForKernel. This area is handled by Secure Modules.
  • Area from 0x400 to 0x75F is handled by NS Kernel SceSblSsMgr.
  • Area from 0x760 to 0xB5F seems to be unused. It is reserved for Test and Tool consoles.
Offset Size Name Comment Used by
0 0x20 Mgmt Data Embeds SNVS flags and ProductMode. Used for Update, PM and QAF. "sceSblQafManagerSetFlag" (sub_81001610 on FW 0.990), "SpkgInfoUtilGetSNVSFlagStatus" and "SpkgInfoUtilSetSNVSFlagStatus" (on FW 0.931), setProductMode
0x20 0x280 SNVS Sectors 19 XTS encrypted sectors of size 0x20 bytes handled by update_service_sm.self "SpkgInfoUtilInitForUpdater" on FW 0.931
0x2A0 0x20 Qa Flag Version 0x10 bytes data + 0x10 bytes AES128CMAC "sceSblQafManagerSetQaFlagVersion" on FW 0.940
0x2C0 0x140 Unknown
0x400 0x80 Qaf Token
0x480 1 Is Qaf Token not set 1 when Qaf Token is not set (FFed), 0 when Qaf Token is set
0x481 0x1F Unknown
0x4A0 0x10 Sysroot#Boot flags sceSblUsGetUpdateModeForUser, sceSblUsSetUpdateModeForUser
0x4B0 0x30 Unknown
0x4E0 0x20 Unknown per device ASCII string ?VisibleId?
0x500 0x20 Unknown
0x520 0x80 Activation Area first 0x20 bytes are SceNVSKitActivationData
0x5A0 0x100 Qaf Token RSA signature Not present on FW 0.990. Present on FW 3.60. Maybe added on FW 1.80.
0x6A0 0xC0 Unknown

Types

typedef struct SceNVSKitActivationData { // size is 0x20 bytes
  char magic[4]; // "act\n"
  uint32_t issue_no;
  uint32_t end_date;
  uint32_t start_date;
  char cmac_hash[0x10];
} SceNVSKitActivationData;

Pinout

Ernie BGA package.

A candidate package for this chip is Renesas' P121F1-50-BAL-1. It has the same size and number of pins.

UART

Name Pin Description
CTS0 J7 UART0 clear to send
RTS0 C6 UART0 request to send
TX0 B6 UART0 transmit
RX0 F11 UART0 receive
SW0 A8 Switch, see UART Console#OLED PSVita UART0 location

SPI

Main communication with Kermit.

Name Pin Description
SS A7 Slave Select (often active low, output from master)
MISO A6 Master In Slave Out (data output from slave)
MOSI C7 Master Out Slave In (data output from master)
SCLK B7 Serial Clock (output from master)

Other

Name Pin Description
? C11 UDC pin 11
? F9 UDC pin 12
? G4 UDC pin 13
? G8 SN99057 pin 38
PWR_SW G6 Power switch through two transistor buffers

Versions

Hardware Versions

See also [1].

Software Versions

See also [2].

Ernie firmware can be partly updated and downgraded with software updates embedded in PUP.

Ernie firmware is dependant of the hardware version and detects it based on Hardware Info.

Examples

With DevKit connected, psp2ctrl info queries return the following results:

DEM-3000H running FW 0.990: 

SysConVersion: 591105

-> converted to hexadecimal: 0x00090501 -> 0.9.5.1

PDEL-1001 running FW 1.692: 

SCVersion: 0.9.2.4

PDEL-1001 running FW 3.600-3.680: 

SCVersion: 1.0.3.6

Downgrade

Syscon is downgradable on DEM/PDEL/PTEL/QAF units. It might also be downgraded on retail when using a downgrade enabler like modoru.

Firmware

See Ernie Firmware

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