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Support for JTAG-PDI based Atmel parts#1077

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dragonmux wants to merge 42 commits intomainfrom

Commits on Jan 1, 2025

avr_pdi: Begun building a scan handler for JTAG-PDI devices
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avr_pdi: Implemented a low-level routine for exchanging PDI messages with the part over JTAG
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avr_pdi: Added validation for a valid part to the JTAG-PDI handler and transitioned the part into PDI mode
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avr_pdi: Implemented PDI register access functions
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atxmega: Implemented a probe routine for some of the ATXMega parts
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avr_pdi: Implement the logic to create the target, populate it, and dispatch to a suitable probe routine
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avr_pdi: Implemented support for target_halt_request
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avr_pdi: Begun implementing a function for target_reset
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avr_pdi: Implemented functions for enabling and disabling PDI controller features
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avr_pdi: Impelemented a function for writing the processor address space
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avr_pdi: Impelemented a function for reading the processor address space
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avr_pdi: Made the processor address space manipulation functions available in the header
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avr_pdi: Implemented a function for accessing a target's avr_pdi_s
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avr_pdi: Implemented a function for asking the target to ensure the NVM controller is idle
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atxmega: Implemented a function for ensuring the NVM controller is idle
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avr_pdi: Implemented functions for attaching and detaching to the target
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avr_pdi: Added handling in avr_reset() for when the PDI controller has things enabled already
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avr_pdi: Implemented type-safe read helpers for the processor address space
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avr_pdi: Implemented a function for writing the PDI pointer register and another for writing the PDI repeat counter
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avr_pdi: Implemented a function for doing an indirect write to the processor address space
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avr_pdi: Implemented a function for doing an indirect read from the processor address space
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atxmega: Implemented a Flash erase routine
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atxmega: Implemented a Flash write routine
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avr_pdi: Implemented target_halt_poll
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avr_pdi: Implemented the AVR registers structure
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atxmega: Implemented building of the target register description XML
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avr_pdi: Added the PDI controller register access functions into the header
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avr_pdi: Moved the target register structure into the header
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atxmega: Implemented a function for reading the ATXMega processor registers
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avr_pdi: Implemented an error state tracker for the PDI structure
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atxmega: Implemented support for reading out memory from the target
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atxmega: Implemented target check_error
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avr_pdi: Added PDI structure definitions for breakpoint handling
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atxmega: Defined the number of breakpoints available on a ATXMega
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avr_pdi: Implemented the debugger-facing part of the breakwatch system
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avr_pdi: Added documentation for how various parts of the support works
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atxmega: Implemented the config breakpoints hook for the AVR support
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avr_pdi: Cleaned up use of `target->priv`
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atxmega: Implemented storage of the program counter from atxmega_regs_read()
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atxmega: Implemented target halt_resume for single stepping
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avr_pdi: Moved all the PDI registers definitions to the header
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atxmega: Created an initial implementation of breakpoint-based halt_resume
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