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| xobs | DFU solves the problem by appending a 16-byte suffix with a crc in it. | 01:43 |
|---|---|---|
| xobs | The nice thing about a suffix is that if you flash it with something other than dfu-util, it's still a valid image. | 01:44 |
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| tinyfpga | xobs: what else is in the suffix besides the crc? | 02:19 |
| xobs | tinyfpga: It includes the VID/PID of the target device, so it doesn't accidentally get flashed to the wrong thing. | 02:20 |
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| xobs | It also has the length, as well as a potential bcdDevice value so you can e.g. check the device is in "update" mode first. | 02:21 |
| cr1901_modern | How do you know the length then? Any inband marker has a nonzero chance of being misinterpreted in the actual data | 02:21 |
| xobs | cr1901_modern: It's a suffix, so it goes at the end of the file. The suffix is for updaters, and is stripped before it gets written. | 02:22 |
| cr1901_modern | Ahh, a _real_ suffix. But what if you have more than one bitstream? | 02:23 |
| cr1901_modern | or more than one payload | 02:23 |
| xobs | It doesn't define the contents of the data at all. You're free to come up with your own format. It's just concerned with cramming bytes into the correct device. | 02:24 |
| xobs | So you could still stick a header on top and have your updater look at that, but still use the DFU suffix for allowing the updater to select the correct device. | 02:24 |
| cr1901_modern | what is DFU anyway? :P | 02:25 |
| xobs | Device Firmware Update. It's a USB spec that uses EP0 control transfers to update devices. | 02:25 |
| xobs | I've discovered with Tomu that it's ridiculously easy for end-users to use. | 02:26 |
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| cr1901_modern | Oh right, eventually I want to play w/ Tomu and add rust support (if not done already). But alas no USB stack yet. | 02:29 |
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| tinyfpga | cr1901_modern: that’s a good opportunity to learn USB | 03:23 |
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| _florent_ | cr1901_modern: minerva is not my core, it's developed by LambdaConcept, i'll just try to help | 06:34 |
| cr1901_modern | mithro: Well my productivity went careening off a cliff tonight. I'll busy during the day tomorrow, so I'll be back on the grind tomorrow night | 06:37 |
| _florent_ | mithro: yes if we add more cpus, we will have to find a way to improve integration. | 06:54 |
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| CarlFK | mithro: shorne: trying to test CFLAGS ... -I$TOP_DIR/third_party/litex/litex/soc/software/include and getting this error, which Im not expecting, wondering if anyone knows whats going on : http://paste.ubuntu.com/p/2KR5n3jwnT/ | 22:08 |
| tpb | Title: Ubuntu Pastebin (at paste.ubuntu.com) | 22:08 |
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