feat: expose MAC, chip revision, and chip features via eFuse reads - #57
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Add Flasher.MAC()/ChipRevision()/ChipFeatures(), reading the factory-programmed base MAC, silicon revision, and feature list straight from eFuse registers, mirroring esptool's read_mac()/ get_major_chip_version()/get_minor_chip_version()/get_chip_features() per chip. - add ReadMAC/ReadChipRevision/ReadChipFeatures func-pointer fields to chipDef, with thin nil-checking dispatchers on Flasher - implement per-chip decoders for ESP32 (classic, lookup-table major revision), S2, S3 (including the ECO0 block-version workaround), C2, C3, C5, C6, H2, and P4-rev1; ESP8266 leaves all three nil - ReadRegister has no isStub() gate, so these work pre- and post-stub (no_reset/SkipStub included) - table-driven host tests per chip covering every decoder branch, plus dispatcher nil-chip/unsupported-chip cases
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Thank you very much for the awesome addition @jgangemi now merging! |
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v0.8.0 adds MAC/chip-revision/chip-features readers (upstream tinygo-org/espflasher#57) plus flash-write reliability fixes. Note: it caps classic-ESP32 UART flash baud at 230400 (FIFO-overflow fix), so flashing an ESP32 over a UART bridge downshifts from pogopin's 460800 default to 230400 — slower but more reliable. Other chip families are unaffected. Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
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What
Adds three methods to
Flasherfor reading chip identity from eFuse:MAC() (net.HardwareAddr, error)— factory-programmed base MACChipRevision() (ChipRevision, error)— silicon revision (Major/Minor,String()→"vX.Y")ChipFeatures() ([]string, error)— human-readable feature list (Wi-Fi/BT, core count, clock, embedded flash/PSRAM, coding scheme, …)Dispatch is via three optional func-pointer fields on
chipDef(ReadMAC/ReadChipRevision/ReadChipFeatures), matching the existingPostConnect/HardResetOTGpattern; per-chip decoders and register constants live in eachtarget_esp32*.go. Chips without a decoder returnUnsupportedCommandError.Supported: ESP32, ESP32-S2, ESP32-S3, ESP32-C2, ESP32-C3, ESP32-C5, ESP32-C6, ESP32-H2, ESP32-P4. ESP8266 is left unsupported (its OTP layout is a different scheme).
Why
These read plain eFuse registers via
READ_REG(0x0A), which — unlikeGET_SECURITY_INFO— is implemented by both the ROM loader and the stub. So they work whether or not the stub is loaded (includingSkipStub/ no-reset flows). All decode logic mirrors esptool's per-chipread_mac(),get_major_chip_version()/get_minor_chip_version(), andget_chip_features().Testing
MAC,ChipRevision(v3.1), andChipFeaturesall matchesptool chip-idoutput exactly. The remaining chip families are esptool-source-verified and host-tested; on-silicon validation for those is still pending.