Non Volatile Storage

Same as PS3's NVS, used for storing tokens and flags. You can access it by using the function icc_nvs_read (or by ftp'ing the respective regions with root flags server).
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's possible to read the other 5 (also the entirety of it by reading /dev/sflash0s0x34 with BUF_SIZE 0x200 from ftp ).
Most, if not all, of the NVS regions can be accessed also in sflash, starting with offset 0x1C4000.

Mapping of the area (NVS service)

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
1	0	0x8000	0x1CC000	0x3000	match, tokens and flags region (backup)
1	1	0xB000	0x1CF000	0x1000	match

Mapping of the detailed area (NVS service)

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 5.05, Unique Identifier of Console, hw_info
0	2	0x4041	0x1C8041	0x1F	Used in later firmwares, Unique Identifier of Console, hw_model
0	2	0x4060	0x1C8060	0x58
0	2	0x40C0	0x1C80C0	0xD
0	2	0x4100	0x1C8100	0x20
0	2	0x47D0	0x1C87D0	0x10	all zeroes usually
0	2	0x47F0	0x1C87F0	0x1
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 proto devkit)
0	4	0x5010	0x1C9010	0x1	vsh_4K Mode (0xFE ON) (0xFF OFF)
0	4	0x5020	0x1C9020	0x1	init_safe_mode flag
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	ethernet related (gbe)
0	4	0x5050	0x1C9050	0x1	is_extra_clock_available_rtc_status
0	4	0x5064	0x1C9064	0x4	sdk version?
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	0x5301	0x1C9301	1	unknown (01 = enabled)
0	4	0x5311	0x1C9311	1	unknown (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
0	4	0x5322	0x1C9322	1	lvp_configure_tccds
0	4	0x5329	0x1C9329	1	related to lvp_config
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
?	?	???	0x1CC31F	1	unknown (01 = enabled)
?	?	???	0x1CF000	1	?? FF disabled 00 enabled