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Reduce Kintex7 boot time when loading from flash #24
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Further input for reference:
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Configuring the bitstream with the constraint
and generating it by use of Vivado seems to be equivalent to generating a binary as mentioned above:
Either file (bitstream or binary) can be programmed by use of openFPGALoader with the commands
and yield short (not delayed) boot up times. |
That’s good, but do we know what’s different between the x4 bitstream and the x1 bitstream in terms of fasm statements? |
I have not looked into that aspect. Just wanted to point out that this seems to be something that is/can be engraved into the bitstream configuration (and not just a binary stream). |
As per this command, we can see the quad mode is introduced during conversion from bitstream to binfile/mcsfile. So this is where we need to look to gain performance, rather than in the spiOverJtag Vivado settings
Originally posted by @unbtorsten and @jrrk2 in trabucayre/openFPGALoader#181 (comment)
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