Editing Non Volatile Storage

The PS4 Non Volatile Storage (NVS) is, like in PS3 and PS Vita, a storage that has two properties: it remains accessible after electricity shortage (unlike RAM) and it is non-removeable (unlike HDD). NVS is mostly used for storing tokens and flags.

On PS4, there are 2 Non Volatile Storages, one in the [[Serial Flash]] and one in the [[Syscon]] EEPROM. On PS3, NVS is stored in Serial Flash (NAND or NOR) whilst on PS Vita, NVS is part of Syscon EEPROM. There is also the Secure NVS (SNVS), which is a secure area of the Syscon NVS. SNVS is encrypted with some SAMU keys and can be accessed only after doing a handshake.

= Syscon NVS =

https://fail0verflow.com/blog/2018/ps4-syscon/

Syscon NVS is accessible from EMC but only after doing the handshake to unlock EMC functionalities.

= Serial Flash NVS =

PS4 [[Serial Flash]] NVS is usually stored at offset 0x1C4000 (it depends on the Serial Flash MBR).

Serial Flash NVS can be accessed from Kernel by calling the function icc_nvs_read. It can also be read by calling IO functions, with System privileges, to open <code>/dev/sflash0s0x34</code>.

== Serial Flash NVS Banks ==

It seems that a total of 7 regions (blocks) exist in 2 banks, main bank and backup bank. The kernel accesses only the 5th and the 2nd region, however it is possible to read the other 5 banks (also the entirety of it by reading /dev/sflash0s0x34 with BUF_SIZE 0x200 from FTP).

{| class="wikitable sortable"
|-
! Bank # !! Block # !! Start Offset in /dev/sflash0s0x34 !! Start Offset in Sflash !! Size !! Notes
|-
| 0 || 0 || 0 || 0x1C4000 || 0x3000 || does not match, probably one (sflash or nvs, likely sflash) updates data
|-
| 0 || 1 || 0x3000 || 0x1C7000 || 0x1000 || match
|-
| 0 || 2 || 0x4000 || 0x1C8000 || 0x800 || match, console data region
|-
| 0 || 3 || 0x4800 || 0x1C8800 || 0x800 || match, all ffs?
|-
| 0 || 4 || 0x5000 || 0x1C9000 || 0x3000 || match, tokens and flags region (backuped at bank 1 block 0)
|-
| 1 || 0 || 0x8000 || 0x1CC000 || 0x3000 || match, tokens and flags region (backup of bank 0 block 4)
|-
| 1 || 1 || 0xB000 || 0x1CF000 || 0x1000 || match
|}

== Detailed Serial Flash NVS Structure ==

{| class="wikitable sortable"
|-
! Bank # !! Block # !! Start Offset in /dev/sflash0s0x34 !! Start Offset in Sflash !! Size !! Notes
|-
| 0 || 0 || 0 || 0x1C4000 || 0x8 || Unknown (e.g 04 01 01 01 01 01 04 01)
|-
| 0 || 0 || 0x20 || 0x1C4020 || 0x6 || Unknown (e.g 02 BC 60 A7 28 83 66)
|-
| 0 || 0 || 0x4E || 0x1C404E || 0x2 || Unknown (e.g 25 16)
|-
| 0 || 0 || 0x50 || 0x1C4050 || 0x5 || Unknown (e.g 12 FF 00 00 00)
|-
| 0 || 0 || 0x60 || 0x1C4060 || 0x5 || Unknown (e.g 04 02 01 01 02)
|-
| 0 || 0 || 0x73 || 0x1C4073 || 0x1 || Unknown (e.g 01)
|-
| 0 || 0 || 0x76 || 0x1C4076 || 0x1 || Unknown (e.g 01)
|-
| 0 || 0 || 0x7A || 0x1C407A || 0x6 || Unknown (e.g 00 00 00 00 00 38)
|-
| 0 || 0 || 0x80 || 0x1C4080 || 0x1 || Unknown (e.g. 00)
|-
| 0 || 0 || 0x82 || 0x1C4082 || 0x3 || Unknown (e.g. 01 01 01)
|-
| 0 || 0 || 0x91 || 0x1C4091 || 0x2 || Unknown (e.g 00 00)
|-
| 0 || 0 || 0x96 || 0x1C4096 || 0x3 || 
|-
| 0 || 0 || 0x9A || 0x1C409A || 0x2 || Unknown (e.g 02 02)
|-
| 0 || 0 || 0x9E || 0x1C409E || 0x2 || Unknown (e.g 00 00)
|-
| 0 || 0 || 0xA0 || 0x1C40A0 || 0x3 || Unknown (e.g 01 01 01)
|-
| 0 || 0 || 0xAC || 0x1C40AC || 0x4 || 
|-
| 0 || 0 || 0xC5 || 0x1C40C5 || 0x3 || Unknown (e.g AA AA AA)
|-
| 0 || 0 || 0x204 || 0x1C4204 || 0x1 || Unknown (e.g 00)
|-
| 0 || 0 || 0x20B || 0x1C420B || 0x1 || Unknown (e.g 00)
|-
| 0 || 0 || 0x210 || 0x1C4210 || 0x2 || Unknown (e.g 49 42)
|-
| 0 || 0 || 0x7FE || 0x1C47FE || 0x2 || Unknown (e.g AF 31)
|-
| 0 || 0 || 0x801 || 0x1C4801 || 0x1 || 
|-
| 0 || 0 || 0x810 || 0x1C4810 || 0x12 || 
|-
| 0 || 0 || 0x84C || 0x1C484C || 0x2 || 
|-
| 0 || 0 || 0x854 || 0x1C4854 || 0x2 || 
|-
| 0 || 0 || 0x870 || 0x1C4870 || 0xC || 
|-
| 0 || 0 || 0x8A0 || 0x1C48A0 || 0x1C || 
|-
| 0 || 0 || 0xFFE || 0x1C4FFE || 0x2 || 
|-
| 0 || 0 || 0x1000 || 0x1C5000 || 0x64 || 
|-
| 0 || 0 || 0x1220 || 0x1C5220 || 0x18 || 
|-
| 0 || 0 || 0x1240 || 0x1C5240 || 0x18 || 
|-
| 0 || 0 || 0x1260 || 0x1C5260 || 0x18 || 
|-
| 0 || 0 || 0x1280 || 0x1C5280 || 0x18 || 
|-
| 0 || 0 || 0x12A0 || 0x1C52A0 || 0x18 || 
|-
| 0 || 0 || 0x12C0 || 0x1C52C0 || 0x18 || 
|-
| 0 || 0 || 0x12E0 || 0x1C52E0 || 0x18 || 
|-
| 0 || 0 || 0x1300 || 0x1C5300 || 0x18 || 
|-
| 0 || 0 || 0x1320 || 0x1C5320 || 0x18 || 
|-
| 0 || 0 || 0x1340 || 0x1C5340 || 0x18 || 
|-
| 0 || 0 || 0x1360 || 0x1C5360 || 0x18 || 
|-
| 0 || 0 || 0x1380 || 0x1C5380 || 0x18 || 
|-
| 0 || 0 || 0x13A0 || 0x1C53A0 || 0x18 || 
|-
| 0 || 0 || 0x13C0 || 0x1C53C0 || 0x18 || 
|-
| 0 || 0 || 0x13E0 || 0x1C53E0 || 0x18 || 
|-
| 0 || 0 || 0x1400 || 0x1C5400 || 0x18 || 
|-
| 0 || 0 || 0x1420 || 0x1C5420 || 0x18 || 
|-
| 0 || 0 || 0x1440 || 0x1C5440 || 0x18 || 
|-
| 0 || 0 || 0x1460 || 0x1C5460 || 0x18 || 
|-
| 0 || 0 || 0x1480 || 0x1C5480 || 0x18 || 
|-
| 0 || 0 || 0x14A0 || 0x1C54A0 || 0x18 || 
|-
| 0 || 0 || 0x14C0 || 0x1C54C0 || 0x18 || 
|-
| 0 || 0 || 0x14E0 || 0x1C54E0 || 0x18 || 
|-
| 0 || 0 || 0x1500 || 0x1C5500 || 0x18 || 
|-
| 0 || 0 || 0x1520 || 0x1C5520 || 0x18 || 
|-
| 0 || 0 || 0x1540 || 0x1C5540 || 0x18 || 
|-
| 0 || 0 || 0x1560 || 0x1C5560 || 0x18 || 
|-
| 0 || 0 || 0x1580 || 0x1C5580 || 0x18 || 
|-
| 0 || 0 || 0x15A0 || 0x1C55A0 || 0x18 || 
|-
| 0 || 0 || 0x15C0 || 0x1C55C0 || 0x18 ||
|-
| 0 || 0 || 0x2000 || 0x1C6000 || 0x8 || 
|-
| 0 || 1 || 0x3000 || 0x1C7000 || 0x40 || 
|-
| 0 || 1 || 0x3040 || 0x1C7040 || 0x10 || trsw_attach (e.g 1F FF 00 00 07 FF FF 07 FF FF 00 00 00 00 00 00)
|-
| 0 || 1 || 0x30A0 || 0x1C70A0 || 0x2 || get_icc_max (e.g 20 9A)
|-
| 0 || 2 || 0x4000 || 0x1C8000 || 0x4C || Serial Number + model Type (CUH-XXXXX), see below
|-
| 0 || 2 || 0x4010 || 0x1C8010 || 0x10 || SOCUID 
|-
| 0 || 2 || 0x4030 || 0x1C8030 || 0x11 || Used in FW 5.05. Unique identifier of console, hw_info (e.g 00TS4DB00K2180050)
|-
| 0 || 2 || 0x4041 || 0x1C8041 || 0x1F || Used in later firmwares. Unique identifier of console, hw_model (e.g DUT-DBW00JK-S0ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ)
|-
| 0 || 2 || 0x4060 || 0x1C8060 || 0x58 || 
|-
| 0 || 2 || 0x40C0 || 0x1C80C0 || 0xD || 
|-
| 0 || 2 || 0x4100 || 0x1C8100 || 0x20 || (e.g 00 02 F4 C1 64 E6 83 41 0C D0 8D 91 38 56 50 AE 15 3E 60 9E 70 16 17 1A 1C 18 26 25 1B 1B F5 F7)
|-
| 0 || 2 || 0x47D0 || 0x1C87D0 || 0x10 || all zeroes usually (e.g 01 01 01 01 01 01 01 01 01 00 00 00 00 00 00 00)
|-
| 0 || 2 || 0x47F0 || 0x1C87F0 || 0x1 ||  (e.g 01)
|-
| 0 || 4 || 0x5000 || 0x1C9000 || 0x20 || dipswitch flags, see below
|-
| 0 || 4 || 0x5000  || 0x1C9000 || 0x1 || SCE_REGMGR_ENT_KEY_DEVENV_TOOL_boot_param (FE Development Mode) (FB Assist Mode) (FF Release Mode)
|-
| 0 || 4 || 0x5003 || 0x1C9003 || 0x1 || Memory Budget (0xFF Normal, 0xFE Large)
|-
| 0 || 4 || 0x5005 || 0x1C9005 || 0x1 || Slow HDD Mode (0xFE ON) (0xFF OFF)
|-
| 0 || 4 || 0x500B || 0x1C900B || 0x1 || Unknown (0x87 on prototype DevKit)
|-
| 0 || 4 || 0x5010 || 0x1C9010 || 0x1 || vsh_4K Mode (0xFE ON) (0xFF OFF)
|-
| 0 || 4 || 0x501F || 0x1C901F || 0x1 || ??? (e.g 7F)
|-
| 0 || 4 || 0x5020 || 0x1C9020 || 0x1 || init_safe_mode flag (e.g F1)
|-
| 0 || 4 || 0x5021 || 0x1C9021 || 0x1 || sysctl_machdep_cavern_dvt1_init_update
|-
| 0 || 4 || 0x5030 || 0x1C9030 || 0x1 || trsw_probe (01 for [ WLAN mode : FT ], else [ WLAN mode : OFF ]) also bt_sdio_probe and trs_probe
|-
| 0 || 4 || 0x5038 || 0x1C9038 || 0x1 || gigabyte ethernet related (gbe)
|-
| 0 || 4 || 0x5050 || 0x1C9050 || 0x1 || is_extra_clock_available_rtc_status
|-
| 0 || 4 || 0x5060 || 0x1C9060 || 0x4 || sdk version 1 (e.g 00 00 50 02 (2.50) probably for active bank
|-
| 0 || 4 || 0x5068 || 0x1C9068 || 0x4 || sdk version 2 (e.g 00 00 05 05 (5.05) probably for inactive bank
|-
| 0 || 4 || 0x5070 || 0x1C9070 || 0x4 || manu_mode related (sdk version?)
|-
| 0 || 4 || 0x5074 || 0x1C9074 || 0x4 || Unknown (e.g. 84 72 4E 57)
|-
| 0 || 4 || 0x507C || 0x1C907C || 0x4 || manu_mode related (sdk version?)
|-
| 0 || 4 || 0x5080 || 0x1C9080 || varies (0x68-0x6C) || acf token <- checked by sceSblDevActVerifyCheckExpire
|-
| 0 || 4 || 0x5100 || 0x1C9100 || 0x100 || sce_cam_error_put
|-
| 0 || 4 || 0x5200 || 0x1C9200 || varies (0x40-0x60) || scrambled/obfuscated eap hdd key <- checked by g_crypt_deferred_init, also checked by read_idstorage
|-
| 0 || 4 || 0x5300 || 0x1C9300 || 0x30 || sam/liverpool flags (fun stuff here) (SEE BELOW)
|-
| 0 || 4 || 0x5301 || 0x1C9301 || 1 || unknown (01 = enabled) (only available for prototype)
|-
| 0 || 4 || 0x5310 || 0x1C9310 || 1 || sam_memtest (01 = enabled)
|-
| 0 || 4 || 0x5311 || 0x1C9311 || 1 || unknown (01 = enabled) (only available for prototype)
|-
| 0 || 4 || 0x5312 || 0x1C9312 || 1 || sam_rngtest (01 = enabled)
|-
| 0 || 4 || 0x531F || 0x1C931F || 1 || UART boot param (setting this to 1 enables UART output on boot)
|-
| 0 || 4 || 0x5320 || 0x1C9320 || 1 || lvp_configure_get_gddr5clk (0x14 = 500Mhz) (whatever value is here is multiplied by 0x19 to get final value) (0xED max value, 5925Mhz) (500Mhz will semi-brick the console with DCT errors, however for some stupid reason BwE's lets you pick ranges from 400 to 2250MHz)
|-
| 0 || 4 || 0x5322 || 0x1C9322 || 1 || lvp_configure_tccds
|-
| 0 || 4 || 0x5323 || 0x1C9323 || 1 || sam_boot_flags (anything other than FF for enabled)
|-
| 0 || 4 || 0x5329 || 0x1C9329 || 1 || related to lvp_config (likely gddr5DebugFlag, 1->Read DBI disabled, 2->Write DBI disabled, 4->ABI disabled, 8->Force auto precharge enabled, 0x10 -> Bank swap disabled, 0x20-> Bank swizzle mode disabled, 0x3F -> Everything set)
|-
| 0 || 4 || 0x5400 || 0x1C9400 || 0x800 || dev/qaf/utkn region (tokens, signatures here) (SEE BELOW)
|-
| 0 || 4 || 0x5400 || 0x1C9400 || 0x210 || token ???
|-
| 0 || 4 || 0x5650 || 0x1C9650 || 0x290 || qafutkn_ioctl
|-
| 0 || 4 || 0x5900 || 0x1C9900 || 0x100 || acf signature
|-
| 0 || 4 || 0x5A00 || 0x1C9A00 || 0x190 || token ???
|-
| 0 || 4 || 0x5C00 || 0x1C9C00 || 0x3C || HDD Info (e.g GHTSH ST4501019A6E08                    613081DJ0124FZD129SN)
|-
| 0 || 4 || 0x5C3C || 0x1C9C3C || 0x04 || Unknown (e.g 05 C6 0A 00)
|-
| 0 || 4 || 0x5C40 || 0x1C9C40 || 0x130 || setPupExpirationStatus
|-
| 0 || 4 || 0x6000 || 0x1CA000 || 0x300 || wrappNvsRead, or regMgrNvsRead
|-
| 0 || 4 || 0x600E || 0x1CA00E || 0x1 || Unknown (Not Regions)
|-
| 0 || 4 || 0x6040 || 0x1CA040 || 0x1 || Circle Button Behaviour (0x01 is Circle Go Back) (0x00 is Circle Accept)
|-
| 0 || 4 || 0x6300 || 0x1CA300 || 0x300 || wrappNvsRead, or regMgrNvsRead
|-
| 0 || 4 || 0x6600 || 0x1CA600 || 0x20 || Modes (See Below)
|-
| 0 || 4 || 0x6600 || 0x1CA600 || 0x1 || SCE_REGMGR_ENT_KEY_SYSTEM_SPECIFIC_idu_mode (0x01 Enabled 0x00 or 0xFF Disabled)
|-
| 0 || 4 || 0x6601 || 0x1CA601 || 0X1 || SCE_REGMGR_ENT_KEY_SYSTEM_update_mode (0xFF or 0x00 disabled) (0x10, 0x20, 0x30, 0x31, 0x32, 0x50 enabled)
|-
| 0 || 4 || 0x6602 || 0x1CA602 || 0x1 || SCE_REGMGR_ENT_KEY_SYSTEM_SPECIFIC_show_mode (0x01 Enabled 0x00 Disabled) (Testkit Only!)
|-
| 0 || 4 || 0x6603 || 0x1CA603 || 0x1 || SCE_REGMGR_ENT_KEY_REGISTRY_recover 
|-
| 0 || 4 || 0x6604 || 0x1CA604 || 0x4 || SCE_REGMGR_ENT_KEY_SYSTEM_soft_version (deprecated) (devkit only?)
|-
| 0 || 4 || 0x6609 || 0x1CA609 || 0x1 || SCE_REGMGR_ENT_KEY_SYSTEM_SPECIFIC_arcade_mode
|-
| 0 || 4 || 0x7C00 || 0x1CBC00 || 0x20 || manu mode (all zeroes for enabled, all ffs for disabled)
|-
| 0 || 4 || 0x7C40 || 0x1CBC40 || 0x20 || 
|-
| 0 || 4 || 0x7CC0 || 0x1CBCC0 || 0x20 || srtc_modevent
|-
| ? || ? || ??? || 0x1CF000 || 1 || ?? FF disabled 00 enabled
|}