15:18 <krickit> hello everybody

15:19 <krickit> i loaded risc-v in my board and it commands led.

15:19 <krickit> now, i want to change order or blinking led

15:20 <krickit> which file i have to change?

15:40 <Claude> Hmm could anyone confirm that lite-pcie isn't currently working on ecp5 ? I somehow was under impression that I saw it working on ecp5 in a tweet some time ago. But now when checking litepcie GitHub I can only find xilinx Phys . Asking because I'm in the process designing a board which needs to have pcie

15:41 <daveshah> Currently, litepcie can only use the Xilinx hard IP PHY

15:41 <Claude> Ok so a artix7 35 is a good candidate ?

15:41 <daveshah> Degi is working on https://github.com/ECP5-PCIe which could eventually plug in to the litepcie infrastructure

15:41 <daveshah> I think so, but better check with _florent_ that it would be big enough

15:42 <Claude> Ok thanks a lot on the confirmation on ecp5 daveshah

15:44 <krickit> daveshah can you help also me?

15:44 <krickit> '=D

15:45 <daveshah> I don't know. The default LiteX environment doesn't use the CPU to blink the LED, it is a separate piece of standalone gateware

15:46 <krickit> ok, so i want to understand how to give commands to litex for complete simple operations

15:46 <krickit> what can i do?

15:47 <krickit> a simple operation like a sum for example

15:47 <daveshah> have you read https://github.com/enjoy-digital/litex/wiki/LiteX-for-Hardware-Engineers ?

15:47 <daveshah> it's the best thing I can point to

15:48 <krickit> ok thanks

15:48 <krickit> i haven't read it

16:14 <somlo> krickit: one more (non-authoritative) data point -- you could look in your build directory under `software/include/generated/csr.h`, there will be `leds_out_[read|write]()` functions; if you add some calls to them from the bare-metal bios that is also built into the bitstream, can you get anything interesting to happen?

16:21 <krickit> somlo I can try. Unfortunately I am now starting to understand how this RiscV works and I am knowledge on the basics is very low

16:23 <krickit> i don't know, for example, how to use the software folder after load bitstream in my fpga

17:04 <somlo> krickit: it's mostly just for reference, once bitstream is built (i.e., for knowing what addresses the various MMIO a.k.a. CSR registers are located at)

17:05 <somlo> that's why I recommended trying to modify the litex/soc/software/bios/... sources *before* you build the bitstream, as that software will be incorporated into the "rom" that's part of the bitstream, and runs on the SoC once it's programmed

17:06 <somlo> alternatively, you use that knowledge from whatever software is loaded by the bios, from microSD, or via tftp, or (lately) via liteSATA

17:07 <somlo> e.g., from a linux kernel driver, or even by reading/writing "memory" pointers from userspace once the kernel is loaded

17:08 <somlo> but (IMHO) the easiest first step to figuring out what reads/writes to/from the LED MMIO register(s) do is to try them as part of the bare-metal bios that's incorporated into the bitstream itself, that way you won't have to deal with loading additional software just to find out