- fpga_target gains max_tck_khz (registry key), the max safe JTAG TCK
for a part/board (0 = unspecified)
- jtag_autoinit, after identifying the chain, resolves the clock: if the
requested JTAG_TCK_FREQ_KHZ exceeds the smallest device max, it clamps
it and re-opens the probe once (stored probe id) to apply, then
re-scans; within-cap / unset just report the cap
- autoinit body extracted into autoinit_run() so it can re-run after the
re-tune; fpga_list shows maxtck
Validated on the IGLOO2/FlashPro (req 500 -> clamp 200 -> reopen -> still
detected; within-cap and unset paths don't reopen).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
- registry moves from the array in fpga.c to fpga_registry.yaml at the
repo root, parsed via libyaml (pkg-config yaml-0.1); adding a part is
now a YAML edit, no rebuild
- looked up CWD-relative (like bsdl_files/), overridable with
$BS_FPGA_REGISTRY, loaded lazily once; public API unchanged
- fpga_list shows the source file (fpga_registry_source())
- add microsemi_igloo2/smartfusion2 and lattice_machxo2/3 families,
ready for the non-Xilinx targets
- docs updated: CLAUDE.md, README, tutorial "add a target" walkthrough
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
"quirk" was unclear jargon; "caveat" matches the wording already used in
the README/CLAUDE.md ("Xilinx caveats"). Renames the struct field, the
FPGA_QUIRK_* macro, the fpga_info output and the docs. No behaviour
change.
modules/fpga/ holds an fpga_target struct (IDCODE/mask, family, IR
length and private opcodes, proxy bitstream path, quirks) and a
compile-time registry. Initial entry: Xilinx Kintex UltraScale+
XCKU15P, populated from bsdl_files/xcku15p_ffve1517.bsd (IDCODE
0x04A56093, IR 6, USER1=0x02, CFG_IN=0x05, JPROGRAM=0x0B, JSTART=0x0C,
JSHUTDOWN=0x0D, ISC_DISABLE=0x16, quirk CCLK_VIA_STARTUP).
Two new script commands:
- fpga_list: enumerate the registry
- fpga_info: match each device on the JTAG chain against the registry
and surface known quirks
Adding another FPGA = one entry in fpga_registry[] + its .bsd in
bsdl_files/. Proxy .bit will be wired in phase 2.5 (bscan_spi/).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
