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secubox-deb/tools/Tow-Boot/doc/variants.md
CyberMind-FR 0d7a21486b feat(tow-boot): Add Tow-Boot with eMMC boot support for MOCHAbin 
- Add Tow-Boot source to tools/ with eMMC boot partition support
- Enable CONFIG_SUPPORT_EMMC_BOOT via mmcBootIndex for MOCHAbin variants
- Document boot mode jumpers J17-J22 (SPI 0x32, eMMC 0x2B)
- Document Tow-Boot build and flashing procedures
- Add known hardware issues (SPI intermittent, eMMC BootROM failure)
- Remove incorrect microSD slot reference from MOCHAbin docs
- Fix systemd service path (/lib → /usr/lib) in mitmproxy package

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
2026-05-03 16:58:25 +02:00

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Variants

  • noenv does not save environment anywhere
  • spi saves the environment to the SPI device
  • mmcboot does not save environment anywhere

noenv

Only the built-in environment is used, read-only. In other words, saveenv does nothing useful.

This variant is to be used with shared firmware storage retrofitted with a Tow-Boot installation. In other words, in a system that does not provide a protective partition for the firmware.

This variant is also used to build the installer images, as it ensures no stray environment will change the behaviour of the installer when booted form the embedded Tow-Boot.

NOTE: This variant is currently used on all shared firwmare storage installations. In other words, using the protective partition does not currently grant the ability to save the environment.

spi

This variant is to be used on systems with SPI Flash as dedicated firmware storage.

mmcboot

This variant is to be used on systems with eMMC Hardware boot partitions as dedicated firmware storage.

Upcoming changes

It is expected that two other types of variants will come in the future. They will provide environment facilities for the shared firmware storage installations with protective partitions.

One will save the environment at the end of the protective partition.

The other, spcecialized for the Raspberry Pi family of hardware, will save the environment as a file on the Tow-Boot firmware partition.