3d2cd477b2
Add EEPROM boot firmware (exp 0xDB) and supporting tools
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Firmware: Rewrite skywalker1.c for EEPROM boot experiment — tests
whether I2C hardware controller works after FX2 boot ROM completes
EEPROM load (bypassing the CPUCS restart that triggers BERR).
Tools:
- fw_load.py: Add I2C cleanup stub, pre-halt register flush, improved
error handling and segment loading
- eeprom_write.py: Add IHX→C2 EEPROM image converter (16KB format
with length-prefixed segments, checksum)
- eeprom_dump.py: Refactor for cleaner output, better hex display
- skywalker_lib.py: Minor I2C register constant updates
Docs:
- EEPROM-RECOVERY.md: Four recovery options for soft-bricked device
(SOIC clip, SDA pull-up, desolder, wait-for-timeout)
- Master reference: Updated with EEPROM boot findings
Status: EEPROM flash blocked — stock firmware I2C proxy returns pipe
errors, host-side 0xA0 writes proven unable to drive peripheral bus.
Device boot ROM intermittently hangs on EEPROM I2C read (~3-6% success).
2026-02-20 10:56:21 -07:00
f1d4f4f010
Add consolidated master hardware/firmware reference
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Merges 11 separate analysis documents into a single 1700-line
authoritative reference covering hardware, USB, vendor commands,
BCM4500 demodulator, tuning protocol, GPIF streaming, LNB/DiSEqC,
GPIO map, firmware versions, I2C bus architecture, and all known
quirks/errata. Corrects BCM4500 I2C address to 0x08 (7-bit)
throughout.
2026-02-12 11:55:01 -07:00
