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.
|0x2C||0x8||Bitfield flags 1|
|0x40||0x20||Bitfield flags 2 (DIP switches)|
|0x60||0x4||DRAM base paddr|
|0x6C||0x4||Boot type indicator (0x20000 on resume), 0x1 = no suspend/boot logo|
|0xC4||0x4||Boot type indicator (0x80 on resume)|
|0xD0||0x4||Saved context paddr|
To convert the bit number to the offset and bit:
offset = start_offset + (bit_num / 32) * 4,
bit = (bit_num % 32) << 1
0-31 is a 32-bit integer of the current time on the devkit CP clock. This is duplicated in 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
sceKernelCheckDipsw but they do not change anything in hardware (only cached values are overwritten).
96-127 does not seem to be used in the kernel.
128-159 are used to store devkit flags. It does not appear to be used in other models.
|159||Devkit in Development Mode|
160-191 are used for SceShell flags.
192-223 are for various debugging options.
|197||Enable kernel console logging|
|211||Enable user UART console logging|
224-255 are used for various system options.