Isochronous USB Issues » History » Version 5
laforge, 01/24/2022 04:16 PM
| 1 | 1 | laforge | h1. Isochronous USB Issues |
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| 3 | It seems there are many XHCI implementations out there that have problems properly computing the isochronous bandwidth limits and hence refuse to activate both [[icE1usb]] interfaces. |
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| 5 | |_.System/Board|_.USB Controller|_.Runs with 2 icE1usb interfaces| |
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| 6 | |Raspberry Pi 3B|built-in|YES| |
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| 7 | |Raspberry Pi 4|VIA XHCI|no| |
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| 8 | |Thinkpad x260|Intel Corporation Sunrise Point-LP USB 3.0 xHCI CoStroller (rev 21)|no| |
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| 9 | 5 | laforge | |PC-Engines APU2/APU3/APU4|AMD GX-412TC SoC|external:"with apu-ehci tool":https://git.sysmocom.de/sysmocom/apu-ehci, internal:YES| |
| 10 | 2 | tnt | |AMD Ryzen|Ryzen CPU|YES| |
| 11 | |AMD Ryzen|X570 chipset|YES| |
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| 12 | 3 | tnt | |Odroid XU4|USB 2.0 port|YES| |
| 13 | |Odroid XU4|USB 3.0 ports|no| |
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| 14 | 4 | tnt | |Soekris net5501|AMD CS5536 OHCI/EHCI|YES| |
| 15 | 2 | tnt | |
| 16 | Note that in all cases, the device needs to be the sole full speed device on the bus since it uses all the full speed bandwidth and AFAICT all root-hubs are single-TT. |
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| 17 | 3 | tnt | It seems that a hub connected to a EHCI/OHCI port works too, but a hub connected to a XHCI port, even one working without hub, doesn't work. (Currently tested only on Ryzen since it's the only working XHCI controller) |
