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docs(target-debug): manuals, breakpoint/watchpoint arsenal, RTT via OpenOCD

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- Link J-Link UM08001, OpenOCD and GDB (Tenth Ed.) manuals
- bp/wp depth with halt-per-hit cost model. Verified on stm32f407disco
  (J-Link) + raspberry_pi_pico (OpenOCD): FPB/DWT budget reads (M4 6 bp/4 wp,
  M0+ 4/2 exact), 'Hardware watchpoint' confirmation rule (software fallback
  single-steps = USB death), OpenOCD data-VALUE watchpoints, dprintf +
  breakpoint command lists exercised on hardware; JLinkGDBServer -singlerun
  lifecycle gotcha
- RTT is not J-Link-only: OpenOCD rtt setup/start/server verified on pico
  (control block found at the nm address, LOG=2 boot banner captured over nc)
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hathach
2026-07-24 14:55:59 +07:00
parent 80a000e2f0
commit b1becd8f5f
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