1.1.1.5 MPU Bootloader Memory Layout

MPU Bootloader persistent storage layout

For SD/eMMC media

• The SD/eMMC media uses FAT-FS file system to store the Bootloader, Application and AT91bootstrap images

For NAND/Serial Flash media

The placement of the AT91bootstrap, Bootloader and the application in Flash memory should be such that the application will not overwrite the Bootloader/AT91bootstrap, and the Bootloader can properly program the application when it is downloaded

• The application code can be placed anywhere after the bootloader end address. The application start address should be aligned to Erase Unit Size of the device.

• As the Bootloader code requires the application start address to be mentioned at compile time, it should match in both the application and bootloader

• The size of application image stores into Metadata region (address: 0x00180000) in the Flash memory

MPU Bootloader execution memory layout

• The following table shows Bootloader and Application start address in DDR memory for all MPU devices

For example, SAMA5D2 DDR execution memory layout is shown in the diagram as below: