KBL Param

The sysroot buffer is a 0x100 or 0x200 sized buffer passed to the secure kernel bootloader in the scratch space and contains all sorts of flags and system parameters. This buffer is copied to the secure kernel, the non-secure kernel loader, and the non-secure kernel and is used by many functions to check for features that are enabled for the system.

Offset	Size	Description
0x0	0x2	Version (usually 1)
0x2	0x2	Sysroot size (0x100 or 0x200)
0x4	0x4	Current Firmware Version
0x8	0x4	Factory Firmware Version
0xC	0x14	unk
0x20	0x10	QA flags
0x30	0x10	Boot flags
0x40	0x20	DIP Switches
0x60	0x4	DRAM base paddr (0x40000000)
0x64	0x4	DRAM size (0x20000000 on retail and testkit, 0x40000000 on DevKit)
0x68	0x4	unk
0x6C	0x4	Boot type indicator 1 (0x20000 on resume - no boot logo, 0x1 on boot - boot logo, 0x4 manufacturing mode)
0x70	0x10	OpenPsId
0x80	0x4	secure_kernel.enp raw data paddr (optional)
0x84	0x4	secure_kernel.enp size (optional)
0x88	0x4	context_auth_sm.self raw data paddr
0x8C	0x4	context_auth_sm.self size
0x90	0x4	kprx_auth_sm.self raw data paddr
0x94	0x4	kprx_auth_sm.self size
0x98	0x4	prog_rvk.srvk raw data paddr
0x9C	0x4	prog_rvk.srvk size
0xA0	0x8	PSCode
0xA8	0x8	unk
0xB0	0x10	Session ID
0xC0	0x4	Unknown, comes from syscon cmd 3
0xC4	0x4	Wakeup factor
0xC8	0x4	Unknown, comes from syscon cmd 0x800 (?Device model dependant?) (ex: 0x40, 0x60, 0x64, 0x3D2, 0xC001C0)
0xCC	0x4	Unknown, comes from syscon cmd 0x100 (0x74FFFFFF on coldboot, 0x74FFBFFF on warmboot, 0x36AFFFXX triggers SetProductMode on 0.940)
0xD0	0x4	Saved context paddr, comes from syscon cmd 0x90 offset 0xC
0xD4	0x4	Hardware Info
0xD8	0x4	Boot type indicator 2
0xDC	0xC	unk
0xE8	0x10	Hardware flags, comes from syscon cmd 6
0xF8	0x4	BootLoader Revision
0xFC	0x4	Sysroot Magic value (0xCBAC03AA)
0x100	0x20	Encrypted Session Key (FW 2.12+)

QA flags

Bit	Description
0x2C + bit 29	Set to skip version checks in system updates
0x2D + bit 30	Checked by SceAppMgr. Dictates if you can pass arguments to sceAppMgrLaunchAppByPathForDriver

The data below contains QA Flags captured (at 0x20 in sysroot buffer) from a system debugger (SD DEM):

Offset(h) 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
00000020  33 00 00 00 00 00 07 05 73 01 00 01 06 03 03 01  3.......s.......

Boot flags

Bit	Description
47	use internal storage

• at 0x30: 0xFF - not update mode
• at 0x33: 0xFF - not safe mode
• at 0x35: FF on FAT - no internal storage or on PSTV or SLIM - internal storage enabled, FE on PSTV or SLIM - internal storage disabled

Hardware Info

Data is returned by SceSyscon.

• 00 60 41 00: PDEL-1XXX
• 00 60 40 00: PCH-10XX / PTEL-1XXX
• 02 60 40 00: PCH-11XX
• 38 22 82 00: PCH-2XXX model revision 0x18
• 30 30 70 00: VTE-XXXX

Bit flags

Bit	Description
2	PSTV Slim
3	PSTV Slim
4	Slim
6	3G Modem
9	Fat
10	always set
11	PSTV
16	Slim
17	PSTV Fat
18	PSTV
19	PSTV
22	Slim
23	?Communication Processor?

Boot type indicator 2

Experimental point of view

- No AC connected + No POWER Button pressed: 0x0
ex: rebooting by software PSVita when AC is not connected

- No AC connected + POWER Button pressed: 0x4
ex: booting PSVita by pressing POWER button when AC is not connected

- AC connected + No POWER Button pressed: 0x8
ex: rebooting by software PSVita when AC is connected
ex: autobooting PSTV/IDU PSVita by pluging AC

- AC connected + POWER Button pressed: 0xC
ex: powering off by software PSTV then booting it by pressing POWER button
ex: booting PSVita by pressing POWER button when AC is connected

Bit flags point of view

Bit	Description
0	AC: connected: 1 - disconnected: 0 (note that PSTV always has AC connected)
1	POWER button: pressed: 1 - not pressed: 0

Wakeup factor

• 14 FF 00 00
• 04 FF 00 00 after normal reboot
• 04 00 00 00
• 00 FF 00 00
• 80 after suspend

DIP Switches

DIP switches area embeds two parts: Communication Processor information as 32-bit integers, followed by DIP switches represented by bitflags.

Offset	Size	Description
0x40	0x4	CP Timestamp 1 (ex: 0x4AD86AB3 -> 16/10/2009 14:44:35)
0x44	0x2	CP Version (ex:0x1301 => 1301 on PDEL-100x)
0x46	0x2	CP Board ID (3 on DEM-300xH, 4 on PDEL-100x)
0x48	0x4	CP Timestamp 2 (identical as 1)
0x4C	0x4	ASLR Seed (?USER flags?) (also set on Retail and TestKit) (ex: 0x00000000 on a DEM-300xH)
0x50	0x4	SDK (SCE) flags (ex: 0x80000000 or 0x80000001 or 0x80000003 or 0x81000000 or 0x81000001 OR 0x0 or 0x2 in release mode)
0x54	0x4	SHELL flags (ex: 0x00000000 on a DEM-300xH)
0x58	0x4	Debug control flags (ex: 0x000413e7 on a DEM-300xH, 0x1453E7 dev mode, 0x080002 release mode)
0x5C	0x4	System control flags (ex: 0x2000001c on a DEM-300xH, 0x20000010 dev mode, 0x20000000 release mode)

DIP Switches bit flags resolving

DIP Switches bit flags are numbered from right to left. Thus, we have to use an algorithm to convert bit number to offset and bit.

To convert the bit number to the offset and bit: offset = 0x40 + (bit_num / 32) * 4, bit = 1 << (bit_num % 32).

CP Information

Bits 0-31 is a 32-bit integer of the current time on the CP clock. This is duplicated in bits 64-95.

Bits 32-47 is a 16-bit integer of the CP version and bits 48-63 is a 16-bit integer of the CP board ID. All integers are little-endian. On non-devkits, these fields are zeroes.

Bits 0-63 are also usable as general purpose switches exposed with sceKernelSetDipsw, sceKernelClearDipsw, and sceKernelCheckDipsw but they do not change anything in hardware (only cached values are overwritten). According to SDK only DIP switches 0-63 are accessible from userland.

User flags

Bits 96-127 does not seem to be used in the kernel.

SDK (SCE) flags

Bits 128-159 are used for DevKit Boot Parameters.

Bit	Description
128	Memory Size. (Extended game memory): On: 1 - Off: 0
129	?Release Mode Console?: On: 1 - Off: 0
152	PS TV Emulation: On: 1 - Off: 0
159	Release Check Mode: Development Mode: 1 - Release Mode: 0

Shell flags

Bits 160-191 are used for SceShell flags.

Bit	Description
168	Memory Size: Console Size: 1 - Development Tool Size: 0
184	Enable extra TTY: On: 1 - Off: 0
185	Enable System Boot Time Notifications: On: 1 - Off: 0

Debug control flags

Bits 192-223 are for various debug options.

Bit	Description
192	?
193	Enable SDbgSdio
194	Enable CP (if disabled it disables Cpup, DbgSdio and UsbDbg)
195	Disable USB Debug. nouse_dbgusb (if enabled, SceUsbDbg doesn't init)
196	Enable kernel UART console logging (if enabled, UART is initialized and SceDebug handlers are set to UART functions).
197	Enable kernel console logging: On: 1 - Off: 0
199	Enable TTY stdio ("tty0:"): On: 1 - Off: 0
200	Stop when an assertion fails: On: 1 - Off: 0
201	Set minimum assertion level to 1: On: 1 - Off: 0
202	Set minimum assertion level to 2: On: 1 - Off: 0
210	Allows Kernel Budget (related to memblock types)
211	Enable usermode UART console logging?
212	?

System control flags

Bits 224-255 are used for various system options.

Bit	Description
224	Allows loading sd0:psp2-config.txt
228	Allows getting and setting Process and Thread HBP and HWP. sceKernelGetPHWPForKernel, sceKernelSetPHWPForKernel, sceKernelGetPHBPForKernel, sceKernelSetPHBPForKernel, sceKernelGetTHBPForDriver, sceKernelSetTHBPForDriver.
229	HDCP related?
251	?
252	? Used in SceSblFwLoader.

Hardware flags

Bit	Description
1	IC Connexant: 1 - yes, 2 - no
5	unk
6	unk
7	unk
14	unk

• all zeroes on most cases
• 47 02, 07 00 on a Slim

Types

typedef struct SceBootArgs {
  uint16_t version;
  uint16_t size;
  uint32_t current_fw_version;
  uint32_t factory_fw_version;
  uint8_t unk_C[0x14];
  uint8_t qa_flags[0x10];
  uint8_t boot_flags[0x10];
  uint32_t devkit_cp_timestamp_1;
  uint16_t devkit_cp_version;
  uint16_t devkit_cp_build_id;
  uint32_t devkit_cp_timestamp_2;
  uint32_t aslr_seed;
  uint32_t devkit_boot_parameters;
  uint32_t unk_54;
  uint32_t devkit_unk_flags;
  uint32_t devkit_flags_3;
  uint32_t dram_base;
  uint32_t dram_size;
  uint32_t unk_68;
  uint32_t boot_type_indicator_1;
  uint8_t openpsid[0x10];
  uint32_t secure_kernel_enp_addr;
  uint32_t secure_kernel_enp_size;
  uint32_t context_auth_sm_self_addr;
  uint32_t context_auth_sm_self_size;
  uint32_t kprx_auth_sm_self_addr;
  uint32_t kprx_auth_sm_self_size;
  uint32_t prog_rvk_srvk_addr;
  uint32_t prog_rvk_srvk_size;
  uint8_t pscode[0x8];
  uint8_t unk_A8[0x8];
  uint8_t session_id[0x10];
  uint32_t unk_C0;
  uint32_t wakeup_factor;
  uint32_t unk_C8;
  uint32_t unk_CC;
  uint32_t resume_context_addr;
  uint32_t hardware_info;
  uint32_t boot_type_indicator_2;
  uint8_t unk_DC[0xC];
  uint8_t hardware_flags[0x10];
  uint32_t bootldr_revision;
  uint32_t magic;
  uint8_t session_key[0x20];
  uint8_t unused[0xE0];
} __attribute__((packed)) SceBootArgs;