Cortex-A8 R2P2.pdf - ARM Information Center

DebugBits Field Function[31:3] - RAZ.Table 12-28 shows how the bit values correspond with the OS Lock Status Registerfunctions.Table 12-28 OS Lock Status Register bit functions[2] 32-bit access Indicates that a 32-bit access is required to write the key to the OS Lock AccessRegister. This bit always reads 0.[1] Lock bit Locked bit:0 = lock is not set1 = lock is set.Writes are ignored. On Present, this bit initializes to the value ofDBGOSLOCKINIT, that is, the OS lock is set if DBGOSLOCKINIT is HIGH.[0] Lock implemented bit Lock implemented bit. It indicates that the OS lock functionality is implemented. Thisbit always reads 1.12.4.19 Operating System Save and Restore RegisterThe OSSRR is a 32-bit read/write register that enables an operating system to save(prior to power-up) or restore (after power-down) those debug registers that reside onthe core power domain while the OS lock is set.Figure 12-16 shows the bit arrangement of the OSSRR.31 0OS save and restoreFigure 12-16 OS Save and Restore Register format12-48 Copyright © 2006-2008 ARM Limited. All rights reserved. ARM DDI 0344E