Problem
The README lists the SPI boot PROM as a headline feature:
SPI boot prom. configurable as USB boot, SPI boot, SPI boot with USB fallback.
But in the design the SPI flash U9 (MX25L3233FM2I, LCSC C190802) is marked dnp=yes — it is intentionally not populated in the base build. This has been confirmed as correct: the flash is populated only when building a SPI-boot variant.
The README does not mention this, so a reader would reasonably expect U9 to be populated out of the box.
Requested change
Update the README so the boot-options description makes clear that:
- The default/base build ships with the SPI flash unpopulated (DNP); the board boots over USB.
- Populating U9 (the
MX25L3233F) is what enables the SPI-boot / SPI-boot-with-USB-fallback configurations.
Exact wording is up to the maintainer — the goal is just to remove the implication that SPI boot is available without fitting U9.
Location
README.md — the "SPI boot prom" bullet.- Design reference:
TAPRX-888.kicad_sch — U9 instance (dnp=yes).
Migrated from ringof#37.
Problem
The README lists the SPI boot PROM as a headline feature:
But in the design the SPI flash U9 (
MX25L3233FM2I, LCSCC190802) is markeddnp=yes— it is intentionally not populated in the base build. This has been confirmed as correct: the flash is populated only when building a SPI-boot variant.The README does not mention this, so a reader would reasonably expect U9 to be populated out of the box.
Requested change
Update the README so the boot-options description makes clear that:
MX25L3233F) is what enables the SPI-boot / SPI-boot-with-USB-fallback configurations.Exact wording is up to the maintainer — the goal is just to remove the implication that SPI boot is available without fitting U9.
Location
README.md— the "SPI boot prom" bullet.TAPRX-888.kicad_sch— U9 instance (dnp=yes).Migrated from ringof#37.