Segger J-Link - ARM Cortex - Background Memory Access

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13.5 ARM Cortex - Background memory access

On ARM Cortex targets, background memory access necessary for RTT is performed

via a so-called AHB-AP which is similar to a DMA but exclusively accessible by the

debug probe. While on Cortex-M targets there is always an AHB-AP present, on Cor-

tex-A and Cortex-R targets this is an optional component. CortexA/R targets may

implement multiple APs (some even not an AHB-AP at all), so in order to use RTT on

Cortex-A/R targets, the index of the AP which is the AHB-AP that shall be used for

RTT background memory access, needs to be manually specified. This is done via the

following J-Link Command string:

CORESIGHT_SetIndexAHBAPToUse on page 225.

For more information about how to use J-Link command strings in various environ-

ments, please refer to

Using command strings on page 241.

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