Will the reprogramming (UDS over CAN) work , when the pflash is read & write protected?

[abulFzl]

Hi,

I am facing one scenario.

I have an ECU with TC397 , I have configured the UCB_PFLASH for read/write protection & UCB_DBG for enabling secure debug.  While flashing through Tace32 I unlock the secure debug with KEYCODE & disable the flash protection after UNLOCKING the PFLASH0. Flashing through trace32 gets successful.

However, when I remove the jtag and try to reprogram the software present in the PFLASH0 using UDS over CAN, reprogramming fails in Routine erase.

When I disable the pflash protection and try to reprogram , reprogramming works fine.

Does this mean that I can't erase the protected pflash and hence the reprogramming won't work (using UDS over CAN) ?

Can someone please help me to understand this?

I am trying to achieve Usecase2 of AP32399_AURIX™_TC3xx_Debug_protection_(with_HSM)_v1.3.0.pdf.

Please help me.

Thanks in advance.

[MoD · Accepted solution]

When you configure the PFLASH write protection then you can't erase or program the pflash if you don't disable the write protection temporarily before erase/program. Please see command disable protection (Command Sequences for Flash Control) for temporarily disable the protection of specific UCB. Previously programmed password of the UCB must be known.