Readout Protection

[Roadrunner1805]

Hello,

is it possible to enable/disable the "readout protection via SWD/JTAG mode for BlueNRG devices? Is it possible with openocd?

BR Sebastian

[Peter BENSCH]

Readout Protection is used to protect the flash from being read out. Deactivating it therefore only makes sense if the flash is completely deleted.
This is why it is written in the data sheets or the reference manual: Disable readout protection: Perform a mass erase of the user flash.

OpenOCD: TN1347, section 6.3 describes the settings and usage together with the RF-Flasher utility.

Does it answer your questions?

Regards
/Peter

[Roadrunner1805]

Not just yet. Is there a command for openocd to enable the "readout protection"? Or for the RF-Flasher command line?

BR Sebastian

[Peter BENSCH]

Well, not really a command but depending on the particular device some data you have to write to a special location. Details can be found in the data sheet or reference manual, if you search for “readout protection”.

[Winfred LU]

To the qeustion: yes for BlueNRG-1/2, partially yes for BlueNRG-LP.

Perform the actions according to your needs.

For BlueNRG-1/2, both can be done via SWD/openocd:

• Enable: Program a secret 64 bit sequence in the last two word address of the user flash.
• Disable: Perform a mass erase

For BlueNRG-LP, readout protection can be disabled via SWD/openocd

• Enable: this has to be enabled by passing a command (0x82) to UART bootloader. Refer to AN5471.
• Disable: perform a mass erase.

AN5471: The BlueNRG-LP, BlueNRG-LPS UART bootloader protocol

[Roadrunner1805]

Thanks.

I got it working with the RF-Flasher Launcher.

I also got it to run passing the command to UART. But how should it work in SWD mode and openocd?