KBL Param

The sysroot buffer is a 0x100 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
0x2C	0x8	Bitfield flags 1
0x40	0x20	Bitfield flags 2 (DIP switches)
0x60	0x4	DRAM base paddr
0x64	0x4	DRAM size
0x6C	0x4	Boot type indicator (0x20000 on resume), 0x1 = no suspend/boot logo
0x70	0x10	Some serial
0x80	0x4	secure_kernel.enp raw data paddr (optional)
0x84	0x4	secure_kernel.enp size (optional)
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	0x2	Unknown
0xA2	0x2	Device type
0xA4	0x4	Unknown
0xB0	0x10	Session ID
0xC4	0x4	Boot type indicator (0x80 on resume)
0xD0	0x4	Saved context paddr
0xF8	0x4	BootLoader Revision

Bitfield Flags

DIP Switches

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

CP Information

Bits 0-31 is a 32-bit integer of the current time on the devkit 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 build ID. All integers are little-endian. On non-devkits, these fields are zero. 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).

User Flags

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

SDK Flags

Bits 128-159 are used to store devkit flags. It does not appear to be used in other models.

Bit	Description
159	Devkit in Development Mode

Shell Flags

Bits 160-191 are used for SceShell flags.

Bit	Description

Debug Flags

Bits 192-223 are for various debugging options.

Bit	Description
197	Enable kernel console logging
211	Enable user UART console logging

System Flags

Bits 224-255 are used for various system options.

Bit	Description