作者：付汉杰，hankf@xilinx.com，文章转载自：博客园
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：
选中 MPSoC IP，在右键菜单中选择Block Properties.
在窗口Block Properties中，选择Properties.
在窗口中，展开 “Config”.
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);
/##################################################################### */
