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11:08
<
tnt >
Does anyone know if the "HOLD" inputs on the ice40 DSP are like ~CE synchronous inputs or is that more like a async latch ?
11:10
<
mwk >
ice40_dsp pass certainly just treats it as ~CE
11:10
<
mwk >
... I'd rather hope it's right
11:10
<
mwk >
also the registers are synchronous anyway, it
*has* to work that way unless something really strange is going on
11:15
<
tnt >
reset looks async though.
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11:42
<
tnt >
Am I blind ? I can't find where nextpnr select which cell variant ( SB_MAC16_ACC_U_32P32_BYPASS / SB_MAC16_ACC_U_32P32_ALL_PIPELINE / ... ) to use from timings.
11:51
<
mwk >
async reset, yes
11:58
<
tnt >
so, IIUC, there is just no timing data used for DSPs. It just randonly assumes 0.1 ns setup time and 0.1 ns clock-to-out for every port.
12:05
<
omnitechnomancer >
That would seem like a hasn't been done properly yet kind of thing?
12:05
<
daveshah >
I guess this was never implemented
12:05
<
tnt >
chipdb.py has nothing to import the timing data for DSPs AFAICT.
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<
lambda >
(it's also a dependency for xc3sprog-svn, which I have the pleasure of maintaining)
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17:17
<
pepijndevos >
lambda, the programmer of the Gowin IDE
17:18
<
pepijndevos >
You don't need a license to use it actually
17:29
<
lambda >
pepijndevos: yeah, can reproduce, seems like a gowin problem though
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17:30
<
lambda >
1.4.8 is the latest ftd2xx version available, not much more one can do about two pieces of proprietary software not interacting
17:32
<
pepijndevos >
lambda, it worked before though... someone suggested the latest kernel broke it
17:33
<
lambda >
pepijndevos: personally I'd blame glibc
17:34
<
pepijndevos >
so it's this function right?
17:34
<
pepijndevos >
Why would ftd2xx fail to find that?
17:35
<
pepijndevos >
And what makes you say it is a Gowin problem?
17:35
<
pepijndevos >
Just trying to understand the linking weirdness going on here
17:35
<
lambda >
yeah, me too
17:36
<
daveshah >
It was deprecated a little while ago, it seems
17:36
<
daveshah >
But I don't know why it needs to
_set_ the system time in the first place...
17:38
<
implr >
seems like LD_PRELOADing a shim that just successfully does nothing should be enough
17:40
<
lambda >
I just tried that, can't get it to work
17:41
<
lambda >
can't find the reference to stime in the libftd2xx.so objdump either for some reason
17:43
<
daveshah >
pepijndevos, are you sure the gowin tools are using system libraries? This seems odd based on my knowledge of vendor tools
17:44
<
daveshah >
system ftd2xx in particular, being rather nonstandard
17:44
<
pepijndevos >
daveshah, I was using the included one, but then deleted it to try the AUR one.
17:44
<
pepijndevos >
Both give the same error
17:45
<
pepijndevos >
Weird, since the stime deprecation mentions it's only unavailable for newly linked objects, so the shipped one should have it
17:45
<
pepijndevos >
Unless it's some transative system deb that is newer than the deprecation or something
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