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17:27
<
Ferixfox >
Heyo. I have a small, probably beginner, issue related to Litex. I wanted to try it out on a Sipeed nano 4K board I got. I got everything setup, it compiles and it seems like it works, but I do not get a serial output.
17:28
<
Ferixfox >
I saw that the TX pin is unused according to the gowin synthesizer, so I disabled the "with_video_terminal". This removes the warning but still no serial output from the bios (With with_video_terminal I get the colored bars on hdmi as expected)
17:28
<
Ferixfox >
In both cases the bios is the exact same size, could it be that the bios tries to output the printfs to the non existing video output instead of to the serial port?
17:51
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18:52
<
trabucayre >
Ferixfox: could you check you use second tty and your terminal emulator is in 115200b ?
18:52
<
trabucayre >
Ferixfox: you have a dock lite or a standard (ie with hdmi & ethernet) ?
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19:26
<
Ferixfox >
I have connected an FTDI 3.3V USB to TTL converter to pin 44/46 and I also checked the second TTY from the board, both had the same result.
19:27
<
Ferixfox >
Would I expect the bios to output to the second TTY from the Sipeed 4K, or to pin 44/46 of the fpga, as that is what I saw in the litex-boards/platform/sipeed_tang_nano_4k file (with a fixme above that serial is for tests and should be changed or removed)
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19:31
<
trabucayre >
Ferixfox: sorry mismatch between board: it's true 4K has an onboard interface but uart requires external ftdi
19:31
<
trabucayre >
ftdi or any usb<->uart
19:31
<
trabucayre >
I assume you have 3 ttyUSBx ?
19:35
<
nickoe >
I am trying to simulate a platform in litex, derived from SimPlatform, but I get an error like this: TypeError: Trying to add <litex.soc.cores.led.LedChaser object at 0x7f29c532ceb0>, which does not implement .elaborate(), as a submodule.
19:35
<
tpb >
Title: dpaste: G98WZ6YA5 (at dpaste.com)
19:39
<
nickoe >
mm, using from migen import * instead of from amaranth.compat import * appears to help..
19:46
<
Ferixfox >
trabucayre: I guessed so yeah, I have an external ftdi cable connected to it. 115200 baud but sadly nothing much. I will try it again in a few with a logic analyzer attached to see if I see something happen.
19:50
<
trabucayre >
make sense
20:22
<
nickoe >
Mm, my vcd or fst files are empty... I wonder wky no content is there, it loos like the Vsim binary is running ok
20:22
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nickoe >
I see a "input wire sim_trace," in the sim.v module, is that supposed to be connected to anything?
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Ferixfox >
trabucayre: I hooked up a logic analyzer and nothing. The line remains low. I also switched the LED pin and the TX pin, then the TX pin nicely shows the square wave of the "led" blinking and the LED pin shows nothing. So it seems like there is no output on the TX pin of the bios.
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trabucayre >
could you try with --flash instead on --load ? I don't remember exactly but I'm not sure bios fit in RAM -> loaded from flash
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nickoe >
Why does trace_end not seem to terminate the simulation by it self?
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Ferixfox >
trabucayre: .... That seems to have fixed it, awesome. The fact that the led and hdmi worked caught me off guard I guess :)
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trabucayre >
for HDMI I'm not sure but for LedChaser it's a controler with specific behaviour by default -> it's true it's hard to see why not working
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trabucayre >
but a small note into .py may help people to avoid spending time with that :)
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trabucayre >
In fact I remembered that because
_florent_ has asked me to add the external flash access support to openFPGALoader for Gowin targets :)
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cr1901 >
I have a test design on another board using the GW1NR-4, but LiteDRAM does not appear to be working properly
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