SPRACZ6 December   2021 TDA4VH-Q1 , TDA4VH-Q1 , TDA4VM , TDA4VM , TDA4VM-Q1 , TDA4VM-Q1

 

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4 HS Device Flashing With OSPI Memory Boot Mode Only

In case, the board design supports only OSPI memory boot mode and there is no support for UART interface, the above methods cannot be used. Also, once the device is converted to HS-SE, as shown in Table 4-1, even the JTAG is locked. This makes it impossible to access flash again after keywriter completed. This requires first JTAG to be unlocked. Here, the secondary boot image is used with JTAG unlock functionality. This boot image replaces the keywriter1 application after the programming key. In this application report, a copy of the keywriter application is used as secondary image to unlock the JTAG, it is named as keywriter2. Then, once the JTAG is unlocked, a JTAG R5F flashing application can be used to flashing the OSPI.

Table 4-1 The JTAG State in GP/HS Silicon
Device Type Variant M3 JTAG States R5F JTAG States
General Purpose (GP) NA Open Open
High Security Field Securable (FS) Closed Open
High Security Security Enforced (SE) Closed Default Closed