MicroBlaze访问Zynq-7000的OCM
1. MicroBlaze AXI访问返回DECODE1C在ZC702单板上，MicroBlaze通过IC/DC端口连接到PS S_AXI_GP0，MicroBlaze读取OCM，得到值DECODE1C。DECODE1C is returned by the AXI Interconnect if it doesn't know how to route a requested AXI transaction.
MicroBlaze改为通过DP端口连接到PS S_AXI_GP0，再读取OCM，正常。2. OCM映射到高地址Zynq-7000的OCM缺省部分映射到0地址，部分映射到0xFFFF0000。如果要把OCM全部映射到高地址，需要配置OCM_CFG寄存器。MicroBlaze不能访问OCM_CFG寄存器，一定要在A9里访问OCM_CFG寄存器。 /*
Register (slcr) OCM_CFG
Absolute Address 0xF8000910
*/
xil_printf("Original OCM_CFG: 0x%08x\r\n", Xil_In32(0xF8000910) );
Xil_Out32(SLCR_UNLOCK, SLCR_UNLOCK_VAL);
Xil_Out32(0xF8000910, 0x1f);
Xil_Out32(SLCR_LOCK, SLCR_LOCK_VAL);
xil_printf("Updated OCM_CFG: 0x%08x\r\n", Xil_In32(0xF8000910) );
3. 参考文章https://www.xilinx.com/support/answers/71416.html
https://www.xilinx.com/video/soc ... source-sharing.html
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