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The SerialWidget inBuf starts to be filled in a modified design (modified to stall for a longer time) while the stall signal is active. As a result, the inBuf already contains an element once the simulation is restored and this is immediately sent to the target. Instead, in the golden design, the inBuf sends the element 2 rocket-chip cycles later than in the modified design because the inBuf had to be filled first

Waveforms showing the issue: waveforms.pdf
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