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Diffstat (limited to 'doc/board/amlogic/khadas-vim3.rst')
| -rw-r--r-- | doc/board/amlogic/khadas-vim3.rst | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/doc/board/amlogic/khadas-vim3.rst b/doc/board/amlogic/khadas-vim3.rst index c1c03212d2..d6a9642ad6 100644 --- a/doc/board/amlogic/khadas-vim3.rst +++ b/doc/board/amlogic/khadas-vim3.rst @@ -18,6 +18,33 @@ Technology Co., Ltd. with the following specifications: Schematics are available on the manufacturer website. +PCIe Setup +---------- +The VIM3 on-board MCU can mux the PCIe/USB3.0 shared differential +lines using a FUSB340TMX USB 3.1 SuperSpeed Data Switch between +an USB3.0 Type A connector and a M.2 Key M slot. +The PHY driving these differential lines is shared between +the USB3.0 controller and the PCIe Controller, thus only +a single controller can use it. + +To setup for PCIe, run the following commands from U-Boot: + +.. code-block:: none + + i2c dev i2c@5000 + i2c mw 0x18 0x33 1 + +Then power-cycle the board. + +To set back to USB3.0, run the following commands from U-Boot: + +.. code-block:: none + + i2c dev i2c@5000 + i2c mw 0x18 0x33 0 + +Then power-cycle the board. + U-Boot compilation ------------------ |