Jeremy Shen
b294dfe58a
Problem: _run_elf_with_xsct() ALWAYS appended ps7_init before dow,
even though PS was already initialized by the prior BIT download step.
Re-running ps7_init after FPGA config resets PS registers (clocks,
DDR, MIO), which breaks subsequent ELF download.
Fix: two-attempt strategy —
1. First try WITHOUT ps7_init (DAP alive from BIT step):
connect → targets 2 → dow → con
2. If that fails, retry WITH ps7_init as DAP recovery:
connect → targets 1 → source ps7_init.tcl → ps7_init → targets 2 → dow → con
Additional improvements:
- Inner _run() helper deduplicates TCL execution logic
- Better progress messages distinguish attempts
- Extended success phrase detection (adds 'Successfully downloaded')
- Nested TimeoutExpired handling per attempt