Date: Sun, 10 Mar 2019 19:55:10 -0600 From: Ian Lepore <ian@freebsd.org> To: bob prohaska <fbsd@www.zefox.net>, freebsd-arm@freebsd.org Subject: Re: Multiport USB hubs/switches on Raspberry Pi Message-ID: <6310a6e3dab9c3dfae7d23a6784f9d71f9728117.camel@freebsd.org> In-Reply-To: <20190310171028.GA64290@www.zefox.net> References: <20190310171028.GA64290@www.zefox.net>
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On Sun, 2019-03-10 at 10:10 -0700, bob prohaska wrote: > Does anyone have experience using multiport USB hubs on freebsd-arm, > specifically in the context of Raspberry Pi 2 or 3? > > I'm interested in trying to use a hub/switch (not sure there's a > difference in the case of USB) to construct a terminal server for > serial console access on a small cluster of Pi's. I'd want about > seven or eight ports, each holding a USB-serial adapter that would > then connect to the GPIO UART pins on one Pi in the cluster. I've > used both USB 3.0 and USB 1.1 hubs, and in both cases odd things > seem to happen from time to time. One potential example is > > > https://www.amazon.com/AmazonBasics-Port-USB-2-0-Hub/dp/B00GGYU46O/ref=sxin_2?keywords=powered+usb+hub&pd_rd_i=B00GGYU46O&pd_rd_r=83f1e3f0-a1e6-40aa-bdd8-aa86a7c0b360&pd_rd_w=foNmt&pd_rd_wg=ncKZR&pf_rd_p=0395a9fd-d124-46c0-a48f-d8582ed1a45c&pf_rd_r=2P9WWPAZGMAA29NMVVV2&qid=1552234319&s=gateway > > > If anyone has experience along these lines or a suggestion > for/against > particular USB devices or versions I'd be curious to know. > > Thanks for reading, > > bob prohaska > I know I've connected a hub to an rpi and didn't have any trouble with it. Probably best to use a hub that has its own power brick. Also, you can get multi-port usb-serial adapters. This is my fave: https://www.amazon.com/dp/B004ETDC8K/ There are also models that are more the size and shape of a usb hub, with DB9 connectors around the edges. If you need to connect up to four bare boards like other RPIs that have .1 headers, I spotted this cool thing: https://www.amazon.com/dp/B07JW4J7KJ -- Ian
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