00:18 <jevinskie[m]> Ah, just AsyncResetSynchronizer right? I think I was reading the docs wrong and missed the async setting part

07:26 <tnt> jevinskie[m]: if your logic is clocked off SCK, AsyncResetSynchronizer really help.

14:36 <alainlou> hey everyone I'm having some trouble getting the code to fit in block RAM on my Cyclone IV board "RZ-EasyFPGA"

14:36 <alainlou> there were two options I was considering:

14:36 <alainlou> 1. any way to reduce code size?

14:36 <alainlou> 2. there's a SPI flash chip which I can use as ROM but it's also the one used for programming "Altera EPCS" - would it be bad if I connected pins from the FPGA to "AS programming" header to try to use this flash chip?

14:36 <alainlou> any help is appreciated!

14:40 <tnt> jevinskie[m]: I just realized I messed up my sentence when rephrasing it ... it's missing "won't" ... it "won't really help".

15:10 <david-sawatzke[m> alainlou: I don't know this board, but I assume the spi flash is connected directly to the fpga to load the bitstream.

15:10 <david-sawatzke[m> If the flash has enough space to fit both the bitstream (if needed) and the programm, you can use the litex spi core to mmap the flash contents.

15:10 <david-sawatzke[m> Then you can tell the bios to jump to the adress where your firmware starts in the flash memory in the wishbone address space.

15:10 <david-sawatzke[m> This is done by setting ROM_BOOT_ADDRESS to the right address, like done here for rom boot https://github.com/enjoy-digital/litex/wiki/Load-Application-Code-To-CPU

15:14 <alainlou> <3 thanks david!

15:15 <alainlou> just to clarify, this is for the BIOS code, not even application code - would the same solution apply?

15:23 <david-sawatzke[m> Oh, you're talking about the bios. There is a mechanism to boot directly from an address without having the bios in the bitstream

15:23 <david-sawatzke[m> But you can also reduce bios code size with things like:

15:23 <david-sawatzke[m> self.add_constant("SDRAM_TEST_DISABLE")

15:24 <david-sawatzke[m> and `builder = Builder(soc, **builder_options, bios_options=["TERM_MINI"])`

15:25 <david-sawatzke[m> But I'd recommend searching the bios code for more things like this

15:29 <alainlou> awesome!

15:29 <alainlou> > There is a mechanism to boot directly from an address without having the bios in the bitstream

15:30 <alainlou> not quite sure what you mean by this?

15:30 <alainlou> is it like the link you gave for application code but for BIOS code as well?

15:31 <david-sawatzke[m> The link I gave is for application code

15:32 <alainlou> yup, but ur saying there's something similar for bios code as well?

15:32 <david-sawatzke[m> I'm don't remember how the other one works

15:32 <alainlou> ah no worries, I'll have a look around

15:32 <alainlou> thanks for all the help!

15:34 <david-sawatzke[m> Yeah, it's primarily intended for if you just want to use application code without any bios, but might (shoud) also work for storing the bios externally

15:46 <jevinskie[m]> tnt: is that because it uses two FFs and introduces a cycle delay? I made a single stage one with one FF that seems to work for my needs. I think metastability won’t be an issue since the CS# setup and hold times should be long enough