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topaz | hi all - I've been playing about with a Zynq XC27010 board, comparing bitstreams in Vivado and from the output of prjxray's bit2fasm - am I right in thinking that prjxray is ignoring the PSS[0-4] tiles that mux the PS stuff to the PL fabric? I can't see any mention of it in the FASM | 18:16 |
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topaz | I can see that the db includes pip lists and connections relating to the PSS tiles but there aren't any segbits dbs so presumably the bitstream mapping isn't known | 18:28 |
sf-slack1 | <kgugala> @topaz - PSS doesn't have any bits (it's always there) | 18:28 |
sf-slack1 | <kgugala> the only bits you have to set is the routing between PSS and FPGA fabric | 18:29 |
topaz | ah ok, so the wiring between the INT_L IMUX_L* tiles along the left hand edge, and the inputs to the PS7 (say, EMIOENET0GMIITXCLK) are fixed? | 18:33 |
sf-slack1 | <kgugala> yes | 18:33 |
mithro | microcolonel: I don't know about nextpnr for Zynq but there is support in vpr and the symbiflow-examples - https://symbiflow-examples.readthedocs.io/en/latest/ | 18:34 |
tpb | Title: Welcome to SymbiFlow examples! SymbiFlow examples documentation (at symbiflow-examples.readthedocs.io) | 18:34 |
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topaz | kgugala: thanks, that makes sense (I am realising the extent to which the Zynq is just an FPGA with a couple of ARMs crudely bolted on - Vivado gives the impression that lots of CPU-related things are bitstream-level settings when they're actually registers that need loading on boot...) | 18:56 |
sf-slack1 | <kgugala> actually, none CPU setting is configured from bitstream :) | 18:57 |
sf-slack1 | <kgugala> all is done from software | 18:57 |
sf-slack1 | <kgugala> (in Vivado's flow this is done in FSBL) | 18:58 |
sf-slack1 | <kgugala> SDK generates ps7_init.c (and ps7_init_gpl.c, which can be used with U-Boot) - this file defines functions configuring the SoC | 18:59 |
sf-slack1 | <kgugala> if you look at it, it is just a bunch of register writes | 18:59 |
sf-slack1 | <kgugala> *registers | 18:59 |
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microcolonel | hmm | 21:22 |
microcolonel | I see it now, thanks for the *, mithro | 21:22 |
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