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| 16:21.24 | bwlang | I have a device (a thermocycler ) that knows how to load programs from a usb device. Is there a way to get a linux host to export a block device as a mass storage device ( so i can update it at will over the network) ? it looks like the linux gadget stuff might do what i want… any advice? |
| 16:36.07 | prpplague | CosmicPenguin: ping |
| 17:00.29 | SpeedEvil | bwlang: yes, usb-mass storage gadget |
| 17:00.49 | SpeedEvil | bwlang: used by almost every android phone |
| 17:01.26 | bwlang | SpeedEvil: i'll try, do i need any special hardware or can i just run this on any system that can run linux? |
| 17:02.16 | SpeedEvil | it needs a USB device capable port. |
| 17:02.28 | SpeedEvil | no desktops can do this |
| 17:02.41 | SpeedEvil | in general, only mobiles and tablets |
| 17:03.38 | SpeedEvil | also, I assume you'd want to he able to virtually unplug and replug? |
| 17:06.03 | _av500_ | my desktop can do that |
| 17:06.13 | _av500_ | there is a nice PCIe card with a usb device chip |
| 17:06.26 | _av500_ | was a blessing to develop gadget stuff |
| 17:06.26 | SpeedEvil | hmm |
| 17:06.42 | SpeedEvil | I do wonder if any motherboards can do it |
| 17:06.43 | _av500_ | t one tie my desktop wasa fully certified M$ DRM 10 device :) |
| 17:06.48 | _av500_ | at one time* |
| 17:07.22 | _av500_ | SpeedEvil: guess not |
| 17:07.38 | SpeedEvil | :-) |
| 17:07.46 | _av500_ | we used thta for MTP development |
| 17:08.24 | SpeedEvil | wished mtp on Linux just worked. |
| 17:09.13 | _av500_ | it mostly does |
| 17:09.21 | _av500_ | libmtp missed >4GB support |
| 17:09.24 | _av500_ | misses |
| 17:10.13 | _av500_ | but I guess it just does not get enough real world use |
| 17:11.05 | SpeedEvil | pretty much a distro question. |
| 17:11.24 | SpeedEvil | way too many 'my ... doesn't work' |
| 17:12.12 | SpeedEvil | a ums gadget driver based off a virtual filesystem populated from cached metadata might be I useful. |
| 17:12.50 | SpeedEvil | few cars that can understand a USB stick know mtp, for example |
| 17:13.59 | _av500_ | thats because M$ DRM 10 fell apart |
| 17:14.02 | _av500_ | aka plays for sure |
| 17:14.51 | SpeedEvil | embedded file systems are a mess |
| 17:15.16 | _av500_ | I hate the SD people for picking exfat |
| 17:16.03 | _av500_ | the camera manufs of course dont care so exfat support will be a must |
| 17:17.00 | _av500_ | I'll write a generic fs driver that has an interpreter and downloads exfat specs from a .tv domian |
| 17:17.04 | _av500_ | domain |
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| 17:45.07 | SpeedEvil | :-) |
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| 18:46.46 | bwlang | SpeedEvil: can you recommend any hardware to use for this… I will want to simulate an unplug replug after update. |
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| 19:27.41 | Kasreyn | 1951 UNIVAC I - Mercury delay line Memory for computers : https://www.youtube.com/watch?v=kignGE77l_I |
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| 20:11.53 | landley | bwlang: also nbd (network block device). |
| 20:13.49 | bwlang | landley: i'm not following you… how can ndb interface with usb? |
| 20:13.56 | bwlang | nbd |
| 20:14.46 | SpeedEvil | bwlang: I don't have any hardware suggestions, _av500_ what device? |
| 20:14.58 | SpeedEvil | any android phone has the hardware |
| 20:15.14 | landley | bwlang: if you have an existing block device, NBD can export it through the network. |
| 20:15.30 | landley | So you can plug it in to anything that does see it as a block device, and then use it anywhere you have a net connection. |
| 20:15.41 | SpeedEvil | he's wanting to pretend to be a UMS device |
| 20:15.43 | bwlang | landley: i need to export something on the filesystem as usb |
| 20:16.06 | landley | Ah. You might be able to beat that out of qemu. |
| 20:16.39 | landley | There's the "emulate a usb block storage device from a host file" code, and there's the "pipe usb packets through libusb to an external consumer". |
| 20:16.47 | landley | Usually they're not used together, and the pipe goes the other way, but in theory... :) |
| 20:17.00 | SpeedEvil | mum, no, over usb gadget |
| 20:17.04 | SpeedEvil | um |
| 20:17.23 | bwlang | SpeedEvil: i doubt any android phones have an ethernet interface… maybe i can find some embedded system with the right usb hardware. |
| 20:17.39 | SpeedEvil | bwlang: why do you need Ethernet? |
| 20:17.46 | SpeedEvil | they all have WiFi |
| 20:17.48 | landley | Really I don't have a clear picture of your setup, and am juggling 3 other things right now... |
| 20:18.04 | bwlang | SpeedEvil: this is a lab environment, no wifi. |
| 20:18.18 | _av500_ | bwlang: what do you need? |
| 20:18.29 | SpeedEvil | the Nokia n900 could do it. |
| 20:18.39 | _av500_ | the beagleboard can do it |
| 20:18.44 | SpeedEvil | oh, forgot WiFi |
| 20:18.48 | SpeedEvil | not awake |
| 20:18.50 | SpeedEvil | yeah! |
| 20:18.52 | _av500_ | wifi? |
| 20:19.00 | _av500_ | bwlang: what do you need? |
| 20:19.11 | bwlang | _av500_: i need to periodically suck down a bunch of text files over an ethernet connection and present them as usb mass storage to a thermocycler. |
| 20:19.38 | _av500_ | use a beagleboard |
| 20:19.44 | _av500_ | the OTG port as usb device |
| 20:19.48 | bwlang | it's intended that somebody reads a program from a usb stick, but i don't want to have to shuffle usb sticks around. |
| 20:19.55 | _av500_ | sure |
| 20:20.05 | bwlang | i'll look at this beagleboard - thanks for the recommendation! |
| 20:20.48 | _av500_ | basically you insmod the gadget driver and it will be a usb device on the bus |
| 20:21.01 | _av500_ | rmmod the module and your connection goes away |
| 20:22.25 | _av500_ | or echo the correct stuff into sysfs, dunno what it is these days |
| 20:27.57 | bwlang | _av500_: any experience with the beaglebone vs. beagleboard? |
| 20:28.28 | prpplague | vs. pandaboard vs. raspberry-pi vs. abacus vs. stones |
| 20:28.29 | SpeedEvil | bone should work too, aiui |
| 20:28.39 | SpeedEvil | pi will not |
| 20:28.47 | SpeedEvil | no usbmdevicxe |
| 20:28.54 | SpeedEvil | USB device mode |
| 20:30.49 | bwlang | i like the look of the xm model… has 4 usb ports. Any reason i could not use all 4? |
| 20:31.08 | bwlang | (for 4 different thermocyclers) |
| 20:31.46 | _av500_ | SpeedEvil: bone is not OTG |
| 20:31.52 | SpeedEvil | oops |
| 20:31.54 | bwlang | or are those just a hub (ie does each one have it's own device) |
| 20:32.00 | _av500_ | bwlang: a) hub |
| 20:32.04 | _av500_ | b) thats on the host port |
| 20:32.05 | bwlang | OTG i see |
| 20:32.18 | _av500_ | you need the mini USB OTG port |
| 20:32.21 | _av500_ | there is only one |
| 20:32.25 | SpeedEvil | go to #beagleboard, and ask if they can all do USB device |
| 20:32.28 | SpeedEvil | or that |
| 20:32.30 | _av500_ | no |
| 20:32.31 | _av500_ | cant |
| 20:32.35 | SpeedEvil | :-) |
| 20:32.35 | _av500_ | thats the EHCI hos |
| 20:32.37 | _av500_ | host |
| 20:33.09 | bwlang | ok - so i need 4 std beagle boards… I'll look around to see if there are other devices out there with multi OTG ports (i guess probably not) |
| 21:01.47 | _av500_ | no |
| 21:01.49 | _av500_ | what for |
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