Southbridge

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PS4 southbridge contains two processors named EMC and EAP on the same die that are mainly used on boot, during rest mode and for servicing.

Components[edit | edit source]

Southbridge processors[edit | edit source]

The two processors are on the same die. It is a SoC (System on Chip).

EMC[edit | edit source]

EMC could stand for External Micro Controller. EMC was named MediaCon by some people when its name was still unknown.

The role of EMC is to load EMC Initial Program Loader, to be an interface for icc for the main APU kernel and Syscon and to offer a debug interface via UART that does not rely on Syscon or main APU. EMC runs its own FreeBSD kernel. It is a Marvell Armada, an ARM-based SoC. Sony stuck a PCIe bridge on it. It exposes ARM peripherals to the x86 side. There is some extra stuff (e.g. HPET, ACPI stuff).

EMC cpuid = 412FC231 (ARM Cortex-M3 r2p1). CPU clock: maybe about 100MHz.

EMC Initial Program Loader[edit | edit source]

EMC Initial Program Loader is stored encrypted in a SLB2 container in PS4 Serial Flash. Its role is to launch both EAP Kernel Boot Loader and AMD bootROM.

EAP[edit | edit source]

EAP could stand for External Application Processor.

The role of EAP is to handle media (online Wireless/GbLAN, Bluray Drive and HDD/SSD) even when the PS4 is in standby mode. EAP runs its own FreeBSD kernel in standby mode, activated to handle tasks such as downloading games updates while the PS4 is in standby.

It handles several tasks to offload the APU:

EAP consists of Marvell PJ4C B0 rev 1 cores, ARMv7 CORTEX-A8 running FreeBSD 9 kernel. CPU clock: 500MHz. DDR clock: 800MHz.

As EAP Core software is unsigned, unencrypted and easily replaceable on PS4 HDD with a PS4 kernel exploit, it is possible to run homebrew code on EAP processor. See eapdev by Bigboss (psxdev).

EAP Kernel Boot Loader[edit | edit source]

EAP Kernel Boot Loader is stored encrypted in a SLB2 container in PS4 Serial Flash. The role of EAP Kernel Boot Loader is to decrypt then uncompress the EAP Kernel. The encrypted EAP Kernel is stored at virtual address 0xC1000000 and the decrypted and uncompressed EAP Kernel is located at virtual address 0xC3000000.

EAP Kernel[edit | edit source]

EAP Kernel is located at virtual address 0xC3000000. Encrypted EAP Kernel is mounted on device da0x2 along with minila file.

minila[edit | edit source]

minila is an ELF file stored in /minila/ folder in EAP virtual filesystem (packed along with EAP Kernel). Minila is "AMD SceSysCore mini" equivalent for EAP.

EAP Core[edit | edit source]

EAP Core is the only usermode executable running on EAP. It is stored unencrypted as SceEapCore.elf in PS4 HDD.

EAP Filesystem from EAP Kernel binary[edit | edit source]

/dev/
/eap_tmp/
/eap_user/
/eap_vsh/
/minila/
/minila/minila
/rescue/
/update/
/user/

EAP files on HDD[edit | edit source]

  • da0x2 HDD partition is mounted to /eap_kern/ but is encrypted. Only EMC Kernel Boot Loader reads and decrypts this partition then loads it in EAP DDR3 memory and launches EMC Kernel.
  • da0x3 HDD partition is mounted to /eap_vsh/.
/eap_vsh/common/
/eap_vsh/common/cert/
/eap_vsh/common/cert/CA_list.cer
/eap_vsh/etc/
/eap_vsh/etc/bgdc/
/eap_vsh/etc/bgdc/config.xml
/eap_vsh/etc/timezone.dat
/eap_vsh/SceEapCore.elf

EAP files on Serial Flash[edit | edit source]

sflash0s0x33: SLB2 container
sflash0s0x33/C0010001: EMC Kernel Boot Loader
sflash0s0x33/C0018001: EMC Kernel Boot Loader Information

Southbridge RAM[edit | edit source]

Southbridge chip is connected to its own DDR3 SDRAM. It is named "sbram" as abbreviation for SouthBridge RAM.

PS4 Fat and Slim[edit | edit source]

PS4 Fat and Slim Southbridge has access to one 2Gb DDR3 chip, for a total of 256MB of memory.

PS4 Pro[edit | edit source]

PS4 Pro Southbridge has access to two 4Gb DDR3 chips, for a total of 1GB of memory.

Serial Flash[edit | edit source]

Southbridge contains a 256MB Serial flash.

Aeolia has Macronix MX25L25635FMI-10G.

Auxiliary components[edit | edit source]

Southbridge is connected to the main APU by PCI-Express x4 and to Syscon by SPI.

Aeolia has SATA bridge MB86C311B, GbLAN controller 88EC060-NN82.

Southbridge revisions[edit | edit source]

There are three major hardware revisions of the PS4 southbridge, named Aeolia, Belize and Baikal.

See also Aeolia.

Motherboards per Southbridge revisions[edit | edit source]

Southbridge Codename Southbridge Labeling Motherboards
Aeolia CXD90025G

CVN-K12
SAA-001
SAB-001

Belize CXD90036G

SAC-001
SAD-001
SAD-003 (1-981-769-11)
HAC-001
NVA-001

Belize 2 CXD90046GG

NVB-003
NVG-001
?SAD-003 (1-981-769-21, 1-981-769-31)?
SAE-001
SAE-003
SAF-003
SAF-005

Baikal CXD90042GG

NVB-004
NVG-002
NVG-004
SAD-002
SAE-002
SAE-004
SAF-004
SAF-006

Southbridge revisions per chassis[edit | edit source]

Model (chassis) Motherboards Southbridge Codename Oldest Manufacturing Date Newest Manufacturing Date
D1000 All CVN Aeolia
1000 All SAA Aeolia
1100 All SAB Aeolia
1200 All SAC Belize 2015-10
2000 SAD-001, SAD-003 (1-981-769-11) Belize 2016-04
2000 SAD-002 Baikal 2016-09
2000 SAD-003 (1-981-769-21, 1-981-769-31) ?Belize or Belize 2? 2016-08
D7000 HAC-001 Belize
7000 NVA-001 Belize 2017-05
2100 SAE-001, SAE-003 Belize 2 2017-11 2017-12
2100 SAE-002, SAE-004 Baikal 2017-06 2017-12
7100 NVB-003 Belize 2 2018-05 2018-08
7100 NVB-004 Baikal 2017-11
2200 SAF-003, SAF-005 Belize 2 2018-06 2018-09
2200 SAF-004, SAF-006 Baikal 2018-03 2020-05
7200 NVG-001, NVG-003 Belize 2 2018-11 2019-05
7200 NVG-002, NVG-004 Baikal 2018-09 2019-06

EMC IPL/EAP KBL Structure[edit | edit source]

magic:           0x%08x
version:         0x%04x
type:            0x%04x
headerSize:      0x%08x
bodySize:        0x%08x
entryPoint:      0x%08x
baseAddr:        0x%08x

EMC UART Debug Communication[edit | edit source]

Aeolia[edit | edit source]

Command/Action Description Notes
_hdmi
boot boots the console
bootadr
 cmd>bootadr
OK 00000000 FFEF 42D4 CCBE 29B9:A2
bootadr:EB
# [PSQ] boot address 00:49
OK 00000000:3A 
bootenable
bootmode
 cmd>bootmode
bootmode:59
# BootMode:AUTO:CF
OK 00000000:3A 

cmd>bootmode 1
bootmode 1:AA
# BootMode:MANUAL:54
OK 00000000:3A

buzzer beep stuff, 7 modes (?) available
cb
cclog
 cmd>cclog
cclog:08
# ChipComm Log:OFF:AA
OK 00000000:3A 

cclog 1
cclog 1:59
# ChipComm Normal Log:ON:F5
OK 00000000:3A

cclog 2
cclog 2:5A
# ChipComm Error  Log:ON:B6
OK 00000000:3A

cmd>cclog 3
cclog 3:5B
# ChipComm Normal Log:ON:F5
# ChipComm Error  Log:ON:B6
OK 00000000:3A
ccom chip communications
ccul
cec
cktemprid
csarea
ddr
ddrr
ddrw
devpm
 cmd>devpm
devpm:1C
# wlan on:F2
# hdd on:70
# usb on:8A
# bd on:06
# acdc on:CB
# pg3 on:4A
# hdmi on:E2
# gbe off:CC
# sdio off:4D
OK 00000000:3A
dled
dsarea
ejectsw ps3, toggles eject switch
errlog ps3, gets error log, 32 possibilities (0-1F)
 errlog 0:DB
# No Code     Rtc      PowState UpCause  SeqNo    DevPm    T(SoC)   T(Exhaust):C4
# 00 C0010201 12F50C61 00FF0001 00000000 006F     0001     FFFF     2100:17
OK 00000000 C0010201 12F50C61 00FF0001 00000000 006F 0001 FFFF 2100:2E 
etempr
 cmd>etempr get
etempr get:ED
#  Main Soc    ::E7
#           Alert Limits = 0x6000:F8
#       Alert Hysteresis = 0x0200:35
#   CriticalTempr Limits = 0x6100:34
#  Intake      ::B9
#           Alert Limits = 0x4700:FD
#       Alert Hysteresis = 0x0200:35
#   CriticalTempr Limits = 0x4800:39
#  Exhaust     ::1F
#           Alert Limits = 0x4700:FD
#       Alert Hysteresis = 0x0200:35
#   CriticalTempr Limits = 0x4800:39
OK 00000000:3A
fdownmode
fdownmode
fdownmode:C3
# FataldownMode:RUN:97
OK 00000000:3A 

fdownmode 1
fdownmode 1:14
# FataldownMode:STOP:E8
OK 00000000:3A
fduty
 fduty get
fduty get:8C
# duty=0x0100(25):67
OK 00000000:3A 
flimit
 flimit get
flimit get:E5
# MainSoc     : max_duty=0x0400 min_duty=0x0100 :4A
# Environment : max_duty=0x0400 min_duty=0x00CD :DB
OK 00000000:3A 
fmode
 mode
fmode:0B
# Fan Mode List:B9
# no:00 mode:AutoServo:61
# no:01 mode:Maximun:99
# no:02 mode:Minimun:98
# no:03 mode:Manual:1A
# no:04 mode:end:F4
OK 00000000:3A 
fservo
 cmd>fservo get
fservo get:F5
#  MainSoc     ::E7
#   SetVal  = 0x00005000:9C
#   PGain   = 0x00000800:3F
#   IGain   = 0x00000080:38
#   ILimit  = 0x0FFFFFFF:2A
#   ULimit  = 0x0FFFFFFF:36
#   DLimit  = 0x0FFFFFFF:25
#   UPLimit  = 0x0FFFFFFF:86
#   DPLimit  = 0x0FFFFFFF:75
#   UILimit  = 0x0FFFFFFF:7F
#   DILimit  = 0x0FFFFFFF:6E
#   DifGain  = 0x00005000:DF
#   DifLimit = 0x00000900:43
#   DifDLimit = 0x00450000:87
#   MaxDduty = 0x00900000:61
#  Environment ::52
#   SetVal  = 0x00003B00:AC
#   PGain   = 0x00000500:3C
#   IGain   = 0x00000005:35
#   ILimit  = 0x0FFFFFFF:2A
#   ULimit  = 0x0FFFFFFF:36
#   DLimit  = 0x0FFFFFFF:25
#   UPLimit  = 0x0FFFFFFF:86
#   DPLimit  = 0x0FFFFFFF:75
#   UILimit  = 0x0FFFFFFF:7F
#   DILimit  = 0x0FFFFFFF:6E
#   DifGain  = 0x00000000:DA
#   DifLimit = 0x0FFFFFFF:D4
#   DifDLimit = 0x0FFFFFFF:18
#   MaxDduty = 0x0FFFFFFF:F2
OK 00000000:3A 
fsstate
cmd>fsstate get
fsstate get:5A
# 0: ctempr=29.50(0x1D80), err=0xFFFFCD80, ierr=0x00000000, duty=0x0100(25):BD
# 1: ctempr=22.75(0x16C0), err=0xFFFFDBC0, ierr=0x00000000, duty=0x00CD(20):E6
OK 00000000:3A
fstartup
ftable
halt ps3, halts the console
haltmode
hdmir
hdmis
hdmistate
 cmd>hdmistate
hdmistate:C3
# == DP Video Setting ==:20
#       MVID           : 0x0:C5
#       NVID           : 0x0:C6
#       MISC 0         : 0:29
#       MISC 1         : 0:2A
#       H Total        : 0:F9
#       V Total        : 0:07
#       H Start        : 0:03
#       V Start        : 0:11
#       Hsync Width    : 0:32
#       Hsync Porality : High Active:F2
#       Vsync Height   : 0:79
#       Vsync Porality : High Active:00
#       Video Width    : 0:24
#       Video Height   : 0:5D
# Wait Power On State.:31
OK 00000000:3A
hdmiw
help
 help:A9
# ANY    "R16":A8
# ANY    "R32":A6
# ANY    "R8":79
# ANY    "W16":AD
# ANY    "W32":AB
# ANY    "W8":7E
# ANY    "_hdmi":F0
# ANY    "boot":A3
# ANY    "bootadr":DA
# ANY    "bootenable":0A
# ANY    "bootmode":48
# ANY    "buzzer":91
# ANY    "cb":B4
# ANY    "cclog":F7
# ANY    "ccul":96
# ANY    "cec":1A
# ANY    "cktemprid":B2
# ANY    "combuf":6B
# ANY    "comlog":70
# ANY    "csarea":5E
# ANY    "ddr":29
# ANY    "ddrc":8C
# ANY    "ddrr":9B
# ANY    "ddrw":A0
# ANY    "devpm":0B
# ANY    "dled":88
# ANY    "dsarea":5F
# ANY    "ejectsw":E4
# ANY    "errlog":7A
# ANY    "etempr":7C
# ANY    "fdownmode":B2
# ANY    "fduty":1B
# ANY    "flimit":74
# ANY    "fmode":FA
# ANY    "fservo":84
# ANY    "fsstate":E9
# ANY    "fstartup":68
# ANY    "getmacadr":97
# ANY    "halt":98
# ANY    "haltmode":3D
# ANY    "hdmir":03
# ANY    "hdmis":04
# ANY    "hdmistate":B2
# ANY    "hdmiw":08
# ANY    "help":98
# ANY    "mbu":33
# ANY    "mduty":22
# ANY    "nvscsum":FE
# ANY    "nvsinit":FA
# ANY    "nvsl2sw":CE
# ANY    "osarea":6A
# ANY    "osbootparam":96
# ANY    "osdebuginfo":84
# ANY    "osstate":F2
# ANY    "pcie":90
# ANY    "pdarea":5C
# ANY    "powcount":6E
# ANY    "powersw":06
# ANY    "powupcause":3B
# ANY    "qafinfo":D3
# ANY    "r16":C8
# ANY    "r32":C6
# ANY    "r8":99
# ANY    "resetsw":FC
# ANY    "rtc":38
# ANY    "runseq":8D
# ANY    "s3state":B6
# ANY    "sb":C4
# ANY    "sbnvs":1B
# ANY    "scfupdbegin":79
# ANY    "scfupddl":44
# ANY    "scfupdend":AB
# ANY    "scnvsinit":D0
# ANY    "scpdis":75
# ANY    "screset":E8
# ANY    "scversion":CB
# ANY    "sdkversion":37
# ANY    "sdnvs":1D
# ANY    "smlog":11
# ANY    "socdmode":3D
# ANY    "socuid":76
# ANY    "spoff":0D
# ANY    "spon":AF
# ANY    "sqlog":15
# ANY    "ssbdis":77
# ANY    "startwd":F8
# ANY    "state":10
# ANY    "stinfo":82
# ANY    "stopwd":90
# ANY    "stwb":AF
# ANY    "subsysid":65
# ANY    "subsysinfo":44
# ANY    "syspowdown":5C
# ANY    "task":A2
# ANY    "tempr":17
# ANY    "temprlog":59
# ANY    "testpcie":50
# ANY    "thrm":AA
# ANY    "uareq1":3E
# ANY    "uareq2":3F
# ANY    "version":F5
# ANY    "vshinfo":EC
# ANY    "w16":CD
# ANY    "w32":CB
# ANY    "w8":9E
# ANY    "wsc":3C
OK 00000000:3A 
mbu
mduty
cmd>mduty get
mduty get:93
#  MainSoc     : duty=0x0000(0):F3
#  Environment : duty=0x0000(0):5E
OK 00000000:3A
nvscsum
 cmd>nvscsum
OK 00000000 FFEF 42D4 CCBE 29B9:A2
nvscsum:0F 
nvsinit
osarea
osstate
pcie
cmd>pcie
pcie:A1
# <PCIe Debug>:05
#   PHY Link                           : Up:A1
#   Data Link                          : Up:0A
# :43
# <PCIe Link Control and Status>:A4
#   Active State Link PM               : Disabled:BD
#   Read Completion Boundary(RCB)      : 64byte:FD
#   Retrain Link                       : 1:71
#   Enable Clock Power Management      : Disable:EE
#   Hardware Autonomous Width          : Enable:0C
#   Link Bandwidth Management Interrupt: Disable:DE
#   Link Autonomous Bandwidth Interrupt: Disable:1B
#   Link Speed                         : Gen1:E7
#   Link Width                         : x4:57
#   Link Traing                        : Done:76
# :43
# <Calib Value>:B5
#   LANE 0                             : 0x60:FB
#   LANE 1                             : 0x5E:10
#   LANE 2                             : 0x5D:10
#   LANE 3                             : 0x5C:10
# :43
# <PCIe Device Status>:12
#   Correctable Error                  : Yes:DE
#   Non-Fatal Error                    : No:84
#   Fatal Error                        : No:AC
#   Unsupported Request Detected       : Yes:E2
OK 00000000:3A
pdarea
powersw ps3, toggles power switch
powupcause
 cmd>powupcause
powupcause:4C
# 04000000 02 00 02 00 00:4B
OK 00000000:3A 
r16
R16
R32
r32
R8
r8
resetsw ps3, toggles reset switch
rtc
 cmd>rtc
rtc:49
# RTC Counter            : 318078913:DE
# RTC Status(0x000001FC) : OK:87
OK 00000000 12F57FC1 000001FC:F3 
sb
 sb
sb:D5
# [Active bank] : Second:E9
OK 00000000:3A
sbnvs
 cmd>sbnvs
sbnvs:2C
# sbnvs : [partitin number]:B5
# [UCMD] Arguments err.:91
NG F0000001:4C 
scfupdbegin
scfupddl
scfupdend
scnvsinit
scpdis
screset ps3, resets syscon
scversion gets syscon version
 cmd>scversion
scversion:DC
# 1.0.0 ET r1808  p1:2D
OK 00000000 C1ET 0001 0000 0000 0710 0001:D1 
sdnvs
 cmd>sdnvs
sdnvs:2E
# sdnvs : [partitin number] [bank number] :F4
# [UCMD] Arguments err.:91
NG F0000001:4C 
smlog
 cmd>smlog
smlog:22
# Packet Log:OFF:F2
OK 00000000:3A 

cmd>smlog 1
smlog 1:73
# Packet Log:ON:B4
OK 00000000:3A
socdmode
 cmd>socdmode
socdmode:4E
# [PSQ] Soc download mode : 0:1B
OK 00000000:3A 
socuid gets socuid, also found in NVS
ssbdis
 cmd>ssbdis
ssbdis:88
# [PSQ] boot disable 00:37
OK 00000000:3A 
startwd
state
 cmd>state
state:21
# system:SSC_SYSTEMSTATE_SOC_UP_IDLE:95
OK 00000000 0005 FF:CB 
stinfo
 cmd>stinfo
stinfo:93
# Updated Sector Adr = 0x1C5000 (table = 0x02 i=0,j=1):29
OK 00000000:3A 
stopwd
stwb
syspowdown shutsdown system
tempr
 cmd>tempr get
tempr get:88
# get all:DC
#  MainSoc     : t=30.25(0x1E40):83
#  Intake      : Disable:8D
#  Exhaust     : t=24.00(0x1800):A6
OK 00000000 1E40 FFFF 1800:55 
testpcie
thrm
uareq1 command to gain more privileges, rsa
uareq2 command to gain more privileges, rsa
version ps3, gets emc version
 cmd>version
version:06
# 1.19.0 E r4336 :51
OK 00000000 E1E 0001 0013 0000 10F0:B1 
W16
w16
W32
w32
w8
w8
W8
wsc

See also:

Southbridge Patches[edit | edit source]

God Mode (All Commands Unlocked)[edit | edit source]

  • Change ALL instances of 03 00 FD 00 to 0F 00 FD 00
  • Change ALL instances of 07 00 FD 00 to 0F 00 FD 00
  • Be extremely careful as this might brick your console if you try weird commands!