Tuesday, 2019-01-22

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robaragoHi to all. I would appreciate a hint from somebody who owns an ECP5 Versa. Anybody?17:37
robaragoIs this devboard good for FOSS development with prjtrellis? Any important issue? My main concern is if it would be possible to run GNU/Linux as a target OS in the FPGA. Do you know any project doing that?17:40
daveshahYes, it's a nice board17:40
daveshahI have done this on a Versa, but there is no support in the open source tools for DDR3, so I added a hat for SDRAM17:41
daveshahThe alternative is to use a ULX3S which has SDRAM on board17:41
robaragoOh, very interesting. I was thinking to purchase the ECP5 because of the DDR3 module but of course I would like to use the open source toolchain... Thank you very much for the link17:42
daveshahThere will be DDR3 support soon (Feb/March hopefully)17:43
daveshahThe main issue is getting litedram ported and working out what primitives it needs17:43
daveshahwe already have bitstream documentation needed for DDR3, just need to finish the place and route side of things17:43
robaragoOh, I could wait, of course. I'm happy to hear that. You're doing a great job17:44
robaragoI like very much the ULX3s but it is available to purchase?17:46
daveshahMight be worth asking here: https://gitter.im/ulx3s/Lobby17:47
tpbTitle: ulx3s/Lobby - Gitter (at gitter.im)17:48
robaragoThank you all very much for the info. Really helpful17:49
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_florent_daveshah: i started porting litedram to ECP5 for DDR3, but it's a bit more work than i expected since we need to use a very specific structure for the IO primitives18:29
_florent_daveshah: it's here: https://github.com/enjoy-digital/versa_ecp5_dram18:29
tpbTitle: GitHub - enjoy-digital/versa_ecp5_dram (at github.com)18:29
daveshah_florent_: awesome18:30
daveshahThat was my feeling once I started looking at the set of primitives too18:30
_florent_daveshah: i'd like to continue working on it but have difficulties finding time for that...18:30
daveshahI'll see if I can play about a bit18:30
_florent_for now, i just tried to instantiate the primitives to be able to route with diamond18:31
daveshah_florent_: just so we are on the same page, this is the error I get atm18:41
daveshah> ERROR - par: Based on physical connectivity, comp "DQSBUFM" has to be placed at site "LDQS29". However, it has been placed at site "LDQS41". This could be caused by a LOCATE preference..18:41
_florent_daveshah: yes i'm not sure it was able to finish place and route regarding my last comment ("almost able to p&r")18:42
_florent_daveshah: btw, i was trying to follow TN126518:43
daveshahI'll take a look over the next few days18:43
daveshahActually I think the trellis db might be useful insight to connectivity...18:44
daveshahI think the current error is because DQS is shared over all IO, whereas it should be per byte group18:44
_florent_ok cool if you look at that18:44
daveshahOK, got it to build at least...18:59
tpbTitle: GitHub - daveshah1/versa_ecp5_dram at fixes (at github.com)19:00
daveshahI think the next step is actually to understand DQSBUFM a bit better...19:04
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mithroMorning everyone!20:32

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