Q.
How can I unlock a secure processor when connecting via an emulator?
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A.
The ADSP-BF70x processor can be locked in order to protect customer IP. There may be times when they will want to gain access to that processor with an emulator and a special key is needed in order to do so. A custom board support file is recommended in this situation with the contents similar to the following, but with the appropriate key in the place of the ones shown:
Custom Board Support Example
<?xml version="1.0" standalone="yes"?>
<?xml
version="1.0"
standalone="yes"?>
<custom-cces-proc-xml
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xsi="
xsi:noNamespaceSchemaLocation="\Analog Devices\CrossCore Embedded Studio 1.1.0\System\ArchDef\ADSP-custom-board.xsd"
processor-family="Blackfin"
file="example_custom_board_support.xml">
<custom-register-reset-definitions>
<register name="userkey0" reset-value="0x00001111" core="Common" />
<register
name="userkey0"
reset-value="0x00001111"
core="Common"
/>
<register name="userkey1" reset-value="0x22223333" core="Common" />
name="userkey1"
reset-value="0x22223333"
<register name="userkey2" reset-value="0x44445555" core="Common" />
name="userkey2"
reset-value="0x44445555"
<register name="userkey3" reset-value="0x66667777" core="Common" />
name="userkey3"
reset-value="0x66667777"
</custom-register-reset-definitions>
</custom-cces-proc-xml>
The 128 bit user key format is
For information on locking the ADSP-BF70x processors, see chapter 30 of the ADSP-BF70x Blackfin+ Processor Hardware Reference manual.