1. Vivado里关闭R5/A53/GPU

有些应用中，需要降低Xilinx MPSoC的功耗。缺省设置中，R5/GPU都被使能。如果需要省电，可以在Vivado里关闭R5/GPU。步骤如下：

1. 选中 MPSoC IP，在右键菜单中选择Block Properties.
2. 在窗口Block Properties中，选择Properties.

1. 在窗口中，展开 “Config”.
2. 在搜索框中输入 “Power”， 出现PSU_RPU_POWER_ON等选项。如果值是1，表示被使能；如果值是0，表示被关闭。如果要关闭，点击最左边的编辑图标，输入0。

编辑前Power选项

编辑后Power选项

在Vivado里编辑完成后，执行“Generate Output Products”, 在导出Hardware的HDF/XSA文件。

2. JTAG检查R5/A53状态

在SDK/Vitis里创建FSBL和Standalone程序，启动后，在XSCT命令后窗口下，检查R5/A53状态，可以看到设置为0的R5/A53的状态是No Power。

xsct% connect
tcfchan#2
xsct% target
  1  PS TAP
     2  PMU
     3  PL
  4  PSU
     5  RPU (Reset)
        6  Cortex-R5 #0 (No Power)
        7  Cortex-R5 #1 (No Power)
     8  APU
        9  Cortex-A53 #0 (Running)
       10  Cortex-A53 #1 (Power On Reset)
       11  Cortex-A53 #2 (No Power)
       12  Cortex-A53 #3 (No Power)

3. 代码 代码在psu_init.c里的函数psu_peripherals_powerdwn_data( )里。

/*
 POWER DOWN REQUEST INTERRUPT ENABLE
/
/
 
 Register : REQ_PWRDWN_INT_EN @ 0XFFD80218
 
 Power-down Request Interrupt Enable for Dual_R5
 
 PSU_PMU_GLOBAL_REQ_PWRDWN_INT_EN_RPU 1
 
 Power-down Request Interrupt Enable for GPU PP0
 
 PSU_PMU_GLOBAL_REQ_PWRDWN_INT_EN_PP0 1
 
 Power-down Request Interrupt Enable for GPU PP1
 
 PSU_PMU_GLOBAL_REQ_PWRDWN_INT_EN_PP1 1
 
 Power-down Request Interrupt Enable for ACPU2
 
 PSU_PMU_GLOBAL_REQ_PWRDWN_INT_EN_ACPU2 1
 
 Power-down Request Interrupt Enable for ACPU3
 
 PSU_PMU_GLOBAL_REQ_PWRDWN_INT_EN_ACPU3 1
 
 Power-down Request Interrupt Enable Register. Writing a 1 to this locati
 
 on will unmask the Interrupt.
 
 (OFFSET, MASK, VALUE) (0XFFD80218, 0x0000043CU ,0x0000043CU)
/
PSU_Mask_Write(PMU_GLOBAL_REQ_PWRDWN_INT_EN_OFFSET,
0x0000043CU, 0x0000043CU);
/##################################################################### */
 
/*
 POWER DOWN TRIGGER
/
/
 
 Register : REQ_PWRDWN_TRIG @ 0XFFD80220
 
 Power-down Request Trigger for Dual_R5
 
 PSU_PMU_GLOBAL_REQ_PWRDWN_TRIG_RPU 1
 
 Power-down Request Trigger for GPU PP0
 
 PSU_PMU_GLOBAL_REQ_PWRDWN_TRIG_PP0 1
 
 Power-down Request Trigger for GPU PP1
 
 PSU_PMU_GLOBAL_REQ_PWRDWN_TRIG_PP1 1
 
 Power-down Request Trigger for ACPU2
 
 PSU_PMU_GLOBAL_REQ_PWRDWN_TRIG_ACPU2 1
 
 Power-down Request Trigger for ACPU3
 
 PSU_PMU_GLOBAL_REQ_PWRDWN_TRIG_ACPU3 1
 
 Power-down Request Trigger Register. Writing a 1 to this location will t
 
 rigger a power-down request to the PMU.
 
 (OFFSET, MASK, VALUE) (0XFFD80220, 0x0000043CU ,0x0000043CU)
/
PSU_Mask_Write(PMU_GLOBAL_REQ_PWRDWN_TRIG_OFFSET,
0x0000043CU, 0x0000043CU);
/##################################################################### */