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<
sensille>
how do i convert the .bit file to mcs? (ecp5/trellis)
<
sensille>
(or just a raw binary file)
<
daveshah>
Usually you can just use the bit file as is
<
sensille>
i've written it to flash and it does not work
<
sensille>
but now you say that i see a bdb3 in there
<
sensille>
so strip the comment, prepend some fffff and bitflip each byte might work
<
daveshah>
The comment doesn't need to be stripped, afaik
<
daveshah>
Not sure about bit flipping, I've never used the SPI flash boot
<
sensille>
maybe. sysconfig guide recommends 16 ff before the bdb3
<
sensille>
in mcs, the bytes are flipped
<
sensille>
ok, that should be easy enough
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<
sensille>
stupid me. after erasing the flash first results immediately got better :)
<
sensille>
i'll still strip the comment, according to docs it's an unnecessary risk
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<
ktemkin>
(as long as the comments themselves don't contain a sync pattern in 'em, you're fine)
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<
Degi>
Neato, the FIFO's from nmigen seem to be working above 600 MHz on the ecp5
<
daveshah>
Seems unlikely
<
Degi>
I mean a 32 bit counter worked till 800, above that the last bits got buggy
<
daveshah>
Is this a 5G transceiver part?
<
Degi>
Yes, speed grade 8
<
daveshah>
Ah that is slightly more plausible as that means overvolted at 1.2V
<
Degi>
Hm interesting
<
Degi>
For some reason the pll lock flickers at 600 MHz (which it didn't do before, though maybe the configuration was different
<
daveshah>
On regular parts BRAM clock to out time is >5ns so you'd be getting 3x the specification
<
daveshah>
More like 2ns for the 5G parts at 1.2V
<
Degi>
Hm doesn't the FIFO use TRELLIS_DPR16X4 instead of memories?
<
daveshah>
Oh, it it's a small one
<
Degi>
Even if I make a big fifo on the order of 20000x8 it still uses these
<
daveshah>
Hmm, not sure how the nmigen FIFO works to know if that is expected or not
<
Degi>
I mean I guess if there's enough of that free and if that's faster than bram... I tried to compile a 1e6x8 but that took too long
<
Degi>
Now I added a second PLL and the first one locks fine... weird (maybe I should stop running it out of spec)
<
Degi>
At 720 MHz, the FIFO or checking mechanism has quite a bunch of errors.
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