1. Vivado里關閉R5/A53/GPU
有些應用中，需要降低Xilinx MPSoC的功耗。缺省設置中，R5/GPU都被使能。如果需要省電，可以在Vivado里關閉R5/GPU。步驟如下：
- 選中 MPSoC IP，在右鍵菜單中選擇Block Properties.
- 在窗口Block Properties中，選擇Properties.
-
在窗口中，展開 “Config”.
-
在搜索框中輸入 “Power”， 出現PSU_RPU_POWER_ON等選項。如果值是1，表示被使能；如果值是0，表示被關閉。如果要關閉，點擊最左邊的編輯圖標，輸入0。
編輯前Power選項
編輯后Power選項
在Vivado里編輯完成后，執行“Generate Output Products”, 在導出Hardware的HDF/XSA文件。
2. JTAG檢查R5/A53狀態
在SDK/Vitis里創建FSBL和Standalone程序，啟動后，在XSCT命令后窗口下，檢查R5/A53狀態，可以看到設置為0的R5/A53的狀態是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. 代碼
代碼在psu_init.c里的函數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);
/##################################################################### */