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Add status for Raspberry 4B support

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Added a link to Raspberry 4B issue https://github.com/raspberrypi/linux/issues/3079.
Once this is fixed in firmware, uhubctl should start working on 4B.
This commit is contained in:
Vadim Mikhailov
2019-07-22 23:18:02 -07:00
parent 15f2d37d79
commit 324acc66fd
1 changed files with 6 additions and 0 deletions
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README.md
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@@ -250,6 +250,12 @@ For reference, Raspberry Pi models have following internal USB topology:
Second hub `1-1.1` (daisy-chained to main): 3 independently controlled ports, `1` is used for Ethernet+wifi,
and ports `2,3` are available with proper per-port power switching.
In other words, 2 out of total 4 ports wired outside do support independent power switching on 3B+.
* 4B: Hardware supports power switching, but current firmware is reporting broken USB descriptors.
For more details see Raspberry Pi issue https://github.com/raspberrypi/linux/issues/3079.
USB3 hub `2`, 4 ports, per-port power switching. BOS `ContainerID` not reported (required for USB3).
USB2 hub `1`, 1 port, no usable ports, connects hub `1-1` below.
USB2 hub `1-1`, 4 ports, dual to USB3 hub above. Hub descriptor incorrectly reports ganged power switching.
USB2 hub `3`, 1 port, OTG controller, incorrectly reports ganged power switching.
As a workaround, you can buy any external USB hub from supported list,
attach it to any USB port of Raspberry Pi, and control power on its ports independently.