ECC Initialization

Zynq UltraScale+ Device Technical Reference Manual (UG1085)

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2.4 English

When the ECC mode is enabled, a write operation computes and stores an ECC code along with the data, and a read operation reads and checks the data against the stored ECC code. Consequently, it is possible to receive ECC errors when reading uninitialized memory locations. To avoid this problem, all memory locations must be written before being read. Writing to the entire DDR DRAM through the CPU can be time intensive. It might be worthwhile to use a DMA device to generate larger bursts to the DDR controller initialization and offload the CPU.

If the ECC mode is selected in the Vivado tools, the first-stage boot loader (FSBL) initializes the DDR DRAM to a known value.