FLIPPIX OS v0.1.1-alpha — Hardware SPI

v0.1.1-alpha

Hardware-SPI microrelease of FLIPPIX OS for Flipper Zero.

Changes since v0.1.0-alpha

• replaced timing-sensitive software bit-banged SD transport with STM32WB55
  hardware SPI2
• uses 250 kHz during SD initialization and 8 MHz for normal transfers
• added bounded SPI flag timeouts so a peripheral fault cannot hang the kernel
• retained software-controlled microSD chip select on PC12
• tested repeated reads, read-write remount, file creation, sync, reboot, and
  persistent data on physical Flipper Zero hardware

Included

• FUZIX kernel for STM32WB55
• compatible 32 MiB read-write microSD root filesystem image
• USB CDC console
• safe ROM DFU flashing script
• automatic reboot2dfu command for later USB-only updates
• Russian and English installation guides

Tested workflow

The release was tested on physical Flipper Zero hardware: hardware-SPI boot,
repeated SD reads, read-write filesystem persistence across reboot, USB CDC,
reboot2dfu, ROM DFU enumeration as 0483:df11, complete erase/download, and
automatic return to FUZIX.

Known limitations

This is an alpha release. Most native Flipper hardware does not yet have FUZIX
drivers. Keep qFlipper available for stock firmware recovery.