BOOTCONF

Address offset: 0x080

Immutable boot region configuration.

If this register is not equal to 0xFFFFFFFF, RRAMC applies these settings to form the immutable boot region.

For an immutable bootloader, recommended value is READ, EXECUTE, SECURE, WRITEONCE, LOCK, and SIZE. READ permission is needed for the CPU to read constants and instructions.

Unused bits (unused fields) must be set to zero.


Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID															G	G	G	G	G			F	E									D	C	B	A
Reset 0xFFFFFFFF				1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1
ID	R/W	Field	Value ID	Value								Description
A	RW1	READ										Read access. Must be enabled in order for the Arm Cortex CPU to start executing from RRAM.
			NotAllowed	0								Reading from the region is not allowed.
			Allowed	1								Reading from the region is allowed
B	RW1	WRITE										Write access
			NotAllowed	0								Writing to the region is not allowed
			Allowed	1								Writing to the region is allowed
C	RW1	EXECUTE										Execute access
			NotAllowed	0								Executing code from the region is not allowed
			Allowed	1								Executing code from the region is allowed
D	RW1	SECURE										Secure access
			NonSecure	0								Both secure and non-secure access to region is allowed
			Secure	1								Only secure access to region is allowed
E	RW1	WRITEONCE										Write-once
			Disabled	0								Write-once disabled
			Enabled	1								Write-once enabled Writes to a 32-bit word in the BOOTCONF region are is only when the current data is 0xFFFFFFFF, otherwise the writes are ignored
F	RW1	LOCK										Enable lock of configuration register
			Disabled	0								Lock is disabled, and the RRAMC region configuration registers for the immutable boot region are writable.
			Enabled	1								Lock is enabled, and the RRAMC configuration registers for the immutable boot region are read-only.
G	RW1	SIZE										Immutable boot region size Configures the region size in kB