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| xobs | mithro: tomu-quickstart and tomu-samples do | 00:57 |
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| futarisIRCcloud | mithro: Is this similar to what you were talking about the other day? https://lkml.org/lkml/2019/3/27/332 | 07:00 |
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| xobs | bunnie is a machine. He just reworked a Fomu board, and now it works. It's very very fragile, but the LED is blinking away. | 07:52 |
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| tnt | xobs: oh nice. pics ? :p | 07:58 |
| * xobs uploaded an image: image.png (468KB) < https://matrix.org/_matrix/media/v1/download/matrix.org/UsLRrphHupiMvICsxTyYHLXo > | 08:25 | |
| xobs | Grain of rice for scale | 08:26 |
| tnt | So he removed the fpga, drilled out the pad I guess, then soldered a wire to the bga pad, then replaced the fpga ? | 08:28 |
| xobs | Almost. Used a wick to hollow out the pad, then put UV coating on top. And he used a fresh FPGA afterwards. | 08:29 |
| tnt | ok. wow ... | 08:30 |
| xobs | So there is now exactly one Fomu DVT board in the wild that works. | 08:39 |
| xobs | "works". I still haven't gotten the SB_WARMBOOT function working. | 08:41 |
| MadHacker | xobs: Just saw his tweet about it. Neat job. | 08:44 |
| MadHacker | I see the board is still swimming in flux in the pic. :) | 08:45 |
| MadHacker | Did he use the normal UV-hardening photoresist stuff for capping the pad/via? | 08:45 |
| xobs | I believe so, yes. | 08:45 |
| MadHacker | I always struggle with patience with it; I use a UV laser for hardening it, and it's still a good 10+ seconds to harden up properly. | 08:48 |
| MadHacker | I've seen some really masterful work with that stuff though. | 08:49 |
| futarisIRCcloud | How much is the replacement FPGA part? | 08:49 |
| MadHacker | Ah yeah, bunnie had tweeted about the soldermark stuff previously actually. Repairing the actual CPU package on an iPhone 6. https://www.youtube.com/watch?v=nap0gtds5tQ&feature=youtu.be&t=1m15s | 08:52 |
| MadHacker | futarisIRCcloud: About £4 | 08:52 |
| MadHacker | Call it $5.50 or something. | 08:53 |
| MadHacker | soldermask not soldermark above. Brain no worky, it's early here. :) | 08:53 |
| xobs | I bought FPGAs off of Digikey. They were expensive, but worth it. | 08:58 |
| MadHacker | https://www.digikey.co.uk/product-detail/en/lattice-semiconductor-corporation/ICE40UP5K-UWG30ITR1K/220-2215-1-ND/9744706?utm_adgroup=Integrated+Circuits&mkwid=sksXezBfx&pcrid=267270543519&pkw=&pmt=b&pdv=c&productid=&slid=&gclid=EAIaIQobChMI59u-8Lqk4QIVw7ztCh26PgWKEAAYASAAEgKPtfD_BwE it's that part, aye? | 09:01 |
| tpb | Title: ICE40UP5K-UWG30ITR1K Lattice Semiconductor Corporation | Integrated Circuits (ICs) | DigiKey (at www.digikey.co.uk) | 09:01 |
| xobs | Okay, so the "icemulti" example appears to work. That's a good sign. | 09:01 |
| xobs | MadHacker: that's the one | 09:01 |
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| m_w | how is the firmware going loaded onto the fomu in production? via test points? | 22:31 |
| m_w | can they be reflashed, post-production if they are bricked? | 22:32 |
| tnt | yes to all | 22:45 |
| tnt | although I think making them 'unbrickable' is pretty high on the list :p | 22:46 |
| m_w | making them unbrickable is a challenge unless the flash has a OTP area or locking or something | 22:47 |
| tnt | and it does | 22:47 |
| m_w | which flash is used in production? | 22:47 |
| tnt | AT25SF161 I think | 22:50 |
| tnt | but xobs would know better | 22:50 |
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