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| whatnick | daveshah: Please see this diamond error -> https://twitter.com/whatnick/status/1202535378269245440/photo/1 , any guidance is appreciated. | 08:00 |
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| daveshah | Never seen this one before | 08:00 |
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| whatnick | Okay ... I also have strange behaviour from the RAM in the OrangeCrab .. other than it being a hardware error I have no clues. I am going to see if I can line up for it to be made at MacroFab and how crazy expensive that might be. | 11:49 |
| daveshah | What was the log output? Have you tried a bitstream that you know works for Greg? | 11:58 |
| daveshah | I know the ecp5ddrphy isn't perfect. It has only been seriously tested on the Versa | 11:59 |
| whatnick | Yep I tried a bitstream he sent it has RAM read errors where alternative bytes are correct | 11:59 |
| whatnick | See this : https://twitter.com/whatnick/status/1202537147418300418/photo/1 | 11:59 |
| daveshah | It looks more like something marginal relating to latencies in the controller or similar | 12:00 |
| whatnick | Cool so salvageable ... ideas on fixing in gateware ? | 12:09 |
| daveshah | Perhaps try poking some of the magic numbers | 12:31 |
| daveshah | or looking at the signals with litescope (better talk to florent about that one) | 12:32 |
| whatnick | Magic numbers where exactly ? | 12:39 |
| whatnick | I am trying to see if I can get another board made. But it will be expensive without Greg's help :D | 12:42 |
| whatnick | https://twitter.com/whatnick/status/1202929515523006464/photo/1 | 12:42 |
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| whatnick | daveshah: Pointers on magic numbers to poke ? | 13:22 |
| whatnick | Delays in sdram code ? | 13:22 |
| daveshah | I think greg pointed to a latency issue? | 13:23 |
| whatnick | Yes ... there is a note I don't quite understand with switches between wishbone bus and soc mode | 13:28 |
| whatnick | #self.comb += dqs_read.eq(rddata_ens[cl_sys_latency+0] | rddata_ens[cl_sys_latency+1]) # Works only with wishbone-bridge test | 13:28 |
| whatnick | So latencies differ in different modes, currently it is in SoC mode and erroring out .. | 13:29 |
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| whatnick | Okay I am off for tonight daveshah , will follow up on litescope suggestions. Will be fun to learn anyway. | 14:29 |
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