Visible to Intel only — GUID: syc1540272328617
Ixiasoft
Visible to Intel only — GUID: syc1540272328617
Ixiasoft
3.1.2. RSU Image Layout in Flash – SDM Perspective
In the RSU case, decision firmware replaces the standard firmware. The decision firmware copies have pointers to the following structures in flash:
- Decision firmware data
- One factory image
- Two configuration pointer blocks (CPBs)
- Each of the Decision Firmware copies point to the Factory Image and both Pointer Block 0 and Pointer Block 1.
- Both Pointer Block 0 and Pointer Block 1 point to Application Images.
The decision firmware data stores basic settings, including the following:
- The clock and pins that connect to quad SPI flash memory
- The Direct to Factory Image pin that forces the SDM to load the factory image
Note: You can set this pin on the following menu in the factory image project: Assignments > Device > Device and Pin Options > Configuration > Configuration Pin Options
- The max_retry parameter value.
The pointer blocks contain a list of application images to try until one of them is successful. If none is successful, the SDM loads the factory image. To ensure reliability, the pointer block includes a main and a backup copy in case an update operation fails.
Both the factory image and the application images start with firmware. First, the decision firmware loads the firmware. Then, that firmware loads the rest of the image. These implementation details are not shown in the figure above. For more information, refer to the Application Image Layout section.