Difference between revisions of "TM4C Security"
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| + | The TI's TM4C series devices allow to disable the debug interface in order to prevent accesses to the device through the JTAG / SWD interface. Standard IEEE instructions (e.g. boundary scan operations) are still possible. Once the debug interface has been disabled, the only way to recover is to perform a special recovery sequence, described in the TM4C reference manual. |
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| + | In order to disable the debug interface, the the ''DBG1''bit of the ''Boot Configuration Register'' (BOOTCFG) needs to be changed from ''1'' (HIGH) to ''0'' (LOW). This register is part of the so called Non-Volatile Registers and therefore, a special sequence is needed to change it. Below, we provide two examples which disable the debug interface. Please note, that a power-on-reset is required after performing the sequence. |
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| + | For further information regarding this topic, please refer to the TI TM4C reference manual. |
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| + | == Script files and sample projects == |
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| + | '''J-Link Commander:''' |
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| + | This J-Link Command File changes the DBG1 bit in the BOOTCFG register from 1 to 0. |
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| + | * [[File:TI_TM4C123BH6PZ_DisableDebugInterface.jlink]] |
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| + | '''J-Flash:''' |
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| + | The disable debug interface sequence has been implemented as part of the exit steps which are executed on "Auto" programming (F7), only. |
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| + | * [[File:TI_TM4C123BH6PZ_DisableDebugInterface.jflash]] |
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Revision as of 11:48, 26 October 2016
The TI's TM4C series devices allow to disable the debug interface in order to prevent accesses to the device through the JTAG / SWD interface. Standard IEEE instructions (e.g. boundary scan operations) are still possible. Once the debug interface has been disabled, the only way to recover is to perform a special recovery sequence, described in the TM4C reference manual. In order to disable the debug interface, the the DBG1bit of the Boot Configuration Register (BOOTCFG) needs to be changed from 1 (HIGH) to 0 (LOW). This register is part of the so called Non-Volatile Registers and therefore, a special sequence is needed to change it. Below, we provide two examples which disable the debug interface. Please note, that a power-on-reset is required after performing the sequence.
For further information regarding this topic, please refer to the TI TM4C reference manual.
Script files and sample projects
J-Link Commander: This J-Link Command File changes the DBG1 bit in the BOOTCFG register from 1 to 0.
J-Flash: The disable debug interface sequence has been implemented as part of the exit steps which are executed on "Auto" programming (F7), only.
