01:38 <jevinskie[m]> It’s a good idea though! The litex peripherals would probably be pretty simple to add to qemu

05:36 <sajattack[m]> my friend wants to write some way of trapping ethernet on the litex board and forwarding it out to the host pc over pcie

05:37 <sajattack[m]> and same for storage

06:36 <jevinskie[m]> A stream multiplexer would be cool to let you use *bone and Ethernet etc over one litepcie stream

06:40 <sajattack[m]> yeah

11:01 <keesj> buildroot is pretty good (designed) to be able to cross compile. What is the reason to run it in qemu ?

22:12 <jevinskie[m]> Anybody know how to keep quartus from optimizing away my signals? /* synthesize keep */ doesn’t work and the sdc constraints for the Ethernet clock nets fail (the port name would work but I don’t want to hack that)

22:12 <sajattack[m]> <keesj> "buildroot is pretty good (..." <- for me it would be to check if things are hardware bugs or software bugs

22:13 <sajattack[m]> also is there anything special about allocating heap memory in linux-litex? This rust code is segfaulting, and more complicated rust code is giving a malloc error

22:13 <sajattack[m]> https://hastebin.com/uceniwicos.php

22:13 <tpb> Title: hastebin (at hastebin.com)

22:13 <jevinskie[m]> Does rust still do stack probing?

22:14 <sajattack[m]> maybe?

22:14 <sajattack[m]> dunno

22:15 <sajattack[m]> if I use a static str instead of a heap string it's totally fine

22:16 <jevinskie[m]> Unclear for riscv. https://github.com/rust-lang/rust/issues/43241 hmm then it’s likely not that

22:17 <jevinskie[m]> This is a Linux binary not bare metal?

22:17 <jevinskie[m]> Oh then that’s just weird =\

22:18 <sajattack[m]> yes it's std linux

22:18 <sajattack[m]> https://hastebin.com/sajifuqifa.yaml these are the errors if you think you can glean anything

22:18 <tpb> Title: hastebin (at hastebin.com)

22:18 <sajattack[m]> I'm just using -Zbuild-std flag on the riscv32gc-unknown-linux-gnu target

22:19 <sajattack[m]> with this linker https://github.com/riscv-software-src/riscv-gnu-toolchain

22:19 <jevinskie[m]> epc is program counter? 0x9 would seem to be a kernel addr no? Or is it a 3/1 GB split?

22:20 <jevinskie[m]> But the fault addr is page zero…

22:23 <jevinskie[m]> Google fu for cause 0xf is failing, I guess that needs some code spelunking and maybe riscv manual to decode -_-

22:23 <sorear> i think it is 3/1, look at the libc load address on the first line...

22:23 <jevinskie[m]> Good point!

22:24 <sorear> table 3.6, mcause values, "15 Store/AMO page fault"

22:26 <sorear> you've pretty clearly got a null pointer deref but without symbols it's hard to say more, do you have a working gdb

22:26 <jevinskie[m]> I’m glad we have a human encyclopedia here, thanks :)

22:29 <sajattack[m]> I tried to play with gdb the other day but it seems my gateware doesn't have the debug port compiled in?

22:29 <sajattack[m]> is there a litex flag to build that?

22:29 <sorear> you don't need a special gateware to run a native linux build of gdb *in* the riscv environment

22:30 <sajattack[m]> oh

22:30 <sajattack[m]> well I don't have that either

22:30 <sorear> you would need one for tethered debugging, but that's not very useful with linux

22:30 <sajattack[m]> is it easy to add gdb to the buildroot?

22:31 <sorear> if it isn't that should be fixed

22:31 <sajattack[m]> I only see binutils in the menuconfig

22:32 <sajattack[m]> I guess I'll try to cross-compile it

22:45 <jevinskie[m]> Does buildroot binutils include gdb? Gdb source lives in the binutils git repo at least

22:45 <sajattack[m]> don't think so

22:45 <jevinskie[m]> crosstool-ng can build it for you easily :)

22:51 <sajattack[m]> ugh it's complaining because I don't have GMP for rv32

22:52 <sajattack[m]> guess I'll give crosstool a go

23:02 <sajattack[m]> I installed crosstool and ctl-ng menuconfig doesn't have a riscv option

23:05 <sajattack[m]> gotta run and buy coffee filters before the coffee shop closes, I'll be back in under an hour probably

23:24 <jevinskie[m]> Did you enable experimental targets? It might not yet be in the packaged version in your is

23:25 <jevinskie[m]> https://github.com/crosstool-ng/crosstool-ng/blob/master/config/arch/riscv.in

23:52 <sajattack[m]> thanks

23:52 <sajattack[m]> it's building now