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ROM
7.3
7.3.1
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7.3.2
Security and rights management
Access and security rules of thumb
PROTB protects against accidental programming/erasures by software running on-chip. It does not
prevent mass-erase via BDM or slave port CI.
The Page Release Register (PRR) allocates the pages of the flash array to be used by Freescale code
and the user application code. (See “Page-Release Register” .) Pages assigned to Freescale are
protected from accidental erasure and can only be erased under tightly controlled conditions.
Mass-erase operational requests supply a mask parameter of 0xFFFFFFFF.
The following resources are restricted to use in Supervisor mode:
— ROM code
— AFE registers
— Flash-controller registers
Asserting security shuts down almost all access via the BDM and slave ports. The only supported
operations in secure state are RESET, MASS ERASE and GET DEVICE INFO.
Security
Users may secure their code from prying eyes by writing a secure code to NVOPT in the flash array. When
the part is subsequently reset, access to the BDM development port is disabled. In addition, ROM-based,
slave-port access is severely restricted.
Security may be cleared by mass-erasing the device. This can be done via BDM by setting
XCSR[ERASE] 1 and resetting the device. The ROM boot code will then erase all application pages (PRR
= 1) 2 in flash memory, regardless of the setting of the flash-protection bit (FOPT[PROTB]) 3 .
Security may also be cleared by mass-erasing the part via the slave-port interface. In such cases (as is the
case for software running on-chip), it is necessary first to set FOPT[PROTB] = 1 using the flash-unprotect
function 4 .
If an attempt is made to read/write any on-chip memory while the device is in a secure state, the
ROM-based, slave-port functions will fail and return a security violation.
1. “Extended Configuration/Status Register” on page 357.
2. “Page-Release Register” on page 78.
3. “Flash Options register” on page 66.
4. “RMF_FLASH_PROTECT and RMF_FLASH_UNPROTECT” on page 111
MMA955xL Intelligent, Motion-Sensing Platform Hardware Reference Manual, Rev. 1.0
Freescale Semiconductor, Inc.
77
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