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laforge, 01/24/2022 04:16 PM
Isochronous USB Issues¶
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.
| System/Board | USB Controller | Runs with 2 icE1usb interfaces |
|---|---|---|
| Raspberry Pi 3B | built-in | YES |
| Raspberry Pi 4 | VIA XHCI | no |
| Thinkpad x260 | Intel Corporation Sunrise Point-LP USB 3.0 xHCI CoStroller (rev 21) | no |
| PC-Engines APU2/APU3/APU4 | AMD GX-412TC SoC | external:with apu-ehci tool, internal:YES |
| AMD Ryzen | Ryzen CPU | YES |
| AMD Ryzen | X570 chipset | YES |
| Odroid XU4 | USB 2.0 port | YES |
| Odroid XU4 | USB 3.0 ports | no |
| Soekris net5501 | AMD CS5536 OHCI/EHCI | YES |
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.
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)
Updated by laforge over 2 years ago · 5 revisions
