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Add a warning and link how to update RPi4B firmware to make power switching work

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Vadim Mikhailov
2020-01-28 11:24:49 -08:00
parent ea70731854
commit bd92bcef2f
1 changed files with 3 additions and 0 deletions
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README.md
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@@ -290,6 +290,9 @@ For reference, supported Raspberry Pi models have following internal USB topolog
##### Raspberry Pi 4B
> :warning: You may need to [update firmware](https://www.raspberrypi.org/documentation/hardware/raspberrypi/booteeprom.md)
to vl805 00137ac or later to make power switching work on RPi 4B.
* USB2 hub `1`, 1 port, only connects hub `1-1` below.
* USB2 hub `1-1`, 4 ports ganged, dual to USB3 hub `2` below, all ports controlled by port 4: