Tuesday, 2021-07-13

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OmkarBhilare[m]In litedram, In case of standalone generation can we control wishbone control and user port address and data width?11:53
OmkarBhilare[m]I have checked all the yml examples here, https://github.com/enjoy-digital/litedram/tree/master/examples11:53
OmkarBhilare[m]none of them used this, that's why I was asking.11:53
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chiefwigmsany tips on how/what to debug w/ the ku+?  i looked briefly at litescope but the doc is just a block diagram picture12:16
chiefwigms:)12:16
_florent_chiefwigms: To use the bridges and LiteScope, you can have a look at:12:44
_florent_https://github.com/enjoy-digital/litex/wiki/Use-Host-Bridge-to-control-debug-a-SoC12:44
_florent_and https://github.com/enjoy-digital/litex/wiki/Use-LiteScope-To-Debug-A-SoC12:44
_florent_If you have a UART, I would put a UARTBone bridge in the design, that would give you read/write access to the main bus of the SoC12:46
_florent_https://github.com/enjoy-digital/litex/wiki/Use-Host-Bridge-to-control-debug-a-SoC#add-a-uart-bridge-to-your-soc12:46
_florent_And then create CSR register in the design to probe value of internal signals (or just add a LiteScope instance)12:47
_florent_for the KU/1000-baseX support, the first thing to look at are the initialization FSM, be sure that TX and RX are initialized correctly12:48
_florent_then check the TX and RX frequencies (can be done with a simple counter running in TX/RX clock domains connected to a CSRStatus that is monitored every second through the bridge)12:49
_florent_Sorry I've not been able to spend time on this yet, too much things to do :)12:50
chiefwigmsk12:51
_florent_OmkarBhilare[m]: For LiteDRAM standalone generation, it's not possible to control the data_width of the wishbone control interface12:52
_florent_initial support has been added for user port data width, but it will probably only be available for the native interface12:52
_florent_(for now)12:53
OmkarBhilare[m]<_florent_ "initial support has been added f"> Okay thanks 12:57
_florent_OmkarBhilare[m]: This has been added with https://github.com/enjoy-digital/litedram/pull/22912:59
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geertu_Anyone else seeing random corruptions with current litex-rebase?15:26
geertu_The /etc/init.d/ scripts fail with weird errors15:27
geertu_cat'ing the files show they're fine15:27
geertu_executing them with "sh -v" shows the messed up content.15:27
geertu_An older version based on v5.13-rc5 works fine, so I'm bisecting...15:28
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somlogeertu_: I am getting occasional invalid opcode kernel oops on rocket, but tracked it down to what is most likely timing failures in the ecp5 bitstream -- rebuilding the bitstream made the kernel stop crashing15:56
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somlono idea what your underlying "hardware" is, but maybe rule that out first, before bisecting?15:57
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blackpepperAfter talking to somlo yesterday, I created a Fedora VM to try linux-on-litex-vexriscv. Now I am finally able to get "litex>" prompt at simulation. Thanks somlo for leading me to switch to Fedora!16:07
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blackpepperNow a question -- Does the simulation accept user keyboard input at "Litex>" prompt? Right now my simulation seems frozen at "Litex>" prompt.16:08
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somloblackpepper: if everything goes well, you should be able to interact with your simulation via the prompt (sorry, can't help you any further, not a vexriscv user, and don't have access to my litex stuff at the moment)16:15
somloblackpepper: also, unrelated to anything, you're disconnecting and re-connecting to this channel about once every 2 minutes -- just FYI :)16:16
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geertusomlo: we'll see...16:20
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blackpepperThanks for letting me know I'm disconnecting at this channel. I'm using https://web.libera.chat/gamja/. I will search around how to keep connected to this channel.16:23
tpbTitle: gamja IRC client (at web.libera.chat)16:23
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blackpepperI will drop from my laptop and reconnect from a remote VM to get better connection.16:34
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geertusomlo: Bisected to ca6eaaa210deec0e ("riscv: __asm_copy_to-from_user: Optimize unaligned memory access and pipeline stall")18:00
geertuwhich looks like an appropriate victim to blame18:00
somlogeertu: fair enough, as long as it doesn't go away if you rebuild the bitstream with a new nextpnr seed :P18:02
somloI assume if you revert that commit things work fine for you once again?18:03
geertuJust tried a revert, works fine. "8*SZREG" looks like a sure disaster on 32-bit, as it will copy only half of the data18:04
geertuDoh, Günter already bisected a failure on rv32 qemu to that commit.18:05
* geertu kicked Tsukamoto-san18:10
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somloso, unlike me, you found a bona fide regression...18:15
geertusomlo: You're using 64-bit rocket, right?18:15
somloyeah18:15
geertuI knew it was working fine on my beagleV, so my first guess was an rv32 issue18:16
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tcal@xobs, mithro mentioned you might have created a way to easily specify a custom Vexriscv build, integrated with a Litex build?    I know how to do one-off experiments by modifying the pythondata-cpu-vexriscv Makefile and/or the top sbt script and rebuilding a specific variant, or also how to add a new variant, but did you have another way?18:23
somlogertu: I assume this will go away eventually (hopefully soon) if I keep rebasing the litex-rebase branch...18:25
somloi.e., whatever fix for this regression will get applied upstream, and pulled into litex-rebase from there18:25
geertusomlo: Yep, I assume it will be fixed quickly upstream18:27
mithrotcal: https://github.com/enjoy-digital/litex/search?q=sbt18:33
tcalmithro: thanks!18:53
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