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L2 Control Register

The L2CTLR_EL1 characteristics are:

Purpose

Provides implementation defined control options for the L2 memory system.

Usage constraints

This register is accessible as follows:

EL0

EL1

(NS)

EL1

(S)

EL2

EL3

(SCR.NS = 1)

EL3

(SCR.NS = 0)

- RW RW RW RW RW

Note

L2CTLR_EL1 is writeable. However, all writes to this register are ignored.

Configurations

L2CTLR_EL1 is architecturally mapped to the AArch32 L2CTLR register. See Control Register.:

There is one L2CTLR_EL1 for the Cortex-A53 processor.

Attributes

L2CTLR_EL1 is a 32-bit register.

Figure 4.58 shows the L2CTLR_EL1 bit assignments.

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Table 4.107 shows the L2CTLR_EL1 bit assignments.

Table 4.107. L2CTLR_EL1 bit assignments
Bits Name Function
[31:26] -

Reserved, res0.

[25:24] Number of cores

Number of cores present:

0b00

One core, core 0.

0b01

Two cores, core 0 and core 1.

0b10

Three cores, cores 0 to 2.

0b11

Four cores, cores 0 to 3.

These bits are read-only and the value of this field is set to the number of cores present in the configuration.

[23] -

Reserved, res0.

[22] CPU Cache Protection

CPU Cache Protection. Core RAMs are implemented:

0

Without ECC.

1

With ECC.

[21] SCU-L2 Cache Protection

SCU-L2 Cache Protection. L2 cache is implemented:

0

Without ECC.

1

With ECC.

This field is RO.

[20:6] -

Reserved, res0.

[5] L2 data RAM input latency

L2 data RAM input latency:

0

1-cycle input delay from L2 data RAMs.

1

2-cycle input delay from L2 data RAMs.

This field is RO.

[4:1] -

Reserved, res0.

[0] L2 data RAM output latency

L2 data RAM output latency:

0

2-cycle output delay from L2 data RAMs.

1

3-cycle output delay from L2 data RAMs.

This field is RO.


To access the L2CTLR_EL1:

	
MRS <Xt>, S3_1_C11_C0_2 ; Read L2CTLR_EL1 into Xt
MSR S3_1_C11_C0_2, <Xt>; Write Xt to L2CTLR_EL1
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