ARM AMBA NIC-301 Specifikace stáhnout pdf (Strana 107)

Programmers Model

ID062813 Non-Confidential

[12] PM_PERCORE_MBOX_ENABLE Recommends boot firmware or operating system action:

Do not use per-core mailboxes for power

management.

Use per-core mailboxes for power

management.

The default is

Unless the operating system intervenes, the software stack

uses the Motherboard Express μATX SYS_FLAGS system

• Power up the non-boot cores after the boot-core has

performed the necessary platform setup.

• Distinguish between a warm reset and a cold reset.

• Determine the common branch address for all cores

after a warm reset.

This bit has no direct effect but when it is

it acts as a hint

from the operating system to the boot firmware to use the

per-core SPC mailbox registers to:

• Distinguish between a warm reset, a cold reset and a

spurious reset of a core, possibly in conjunction with

another software-defined method. This includes the

ability to independently power up each non-boot core

after a cold reset.

• Determine the branch address of a core after a warm

reset.

This enables the operating system to implement a full power

management system and ensure that the boot firmware

complies with that implementation.

See application note AN318, CoreTile

™

Express A15x2 A7x3

Power Management.

Table 3-28 Test chip CFGREG48 Register bit assignments (continued)

Bits Name Function

1 2 ... 102 103 104 105 106 107 108 109 110 111 112 ... 177 178

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ARM AMBA NIC-301 Specifikace Strana 107