release_note_21.11.x.txt

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*** ChibiOS 21.11.x Release Notes.                                         ***
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ChibiOS 21.11.x is composed of several independent but inter-operable
sub-projects: RT, NIL, SB, HAL, EX. Plus several external libraries
integrated in our structure: WolfSSL, FatFS and lwIP.

*** ChibiOS 21.11.x highlights ****

- New sandboxes sybsystem 2.0.
- FatFS support for lwIP HTTPD subsystem.
- Improved HTTPD support in MAC demo.
- Improved STM32 HAL.
- Added ARMv7-M (alternate) port.
- New unit test library.

*** What's new in RT/NIL ports ***

- New ARMv7-M-ALT port can be used as alternative of the classi ARMv7-M port:
  - Lower thread-to-thread performance.
  - Improved IRQ latency.
  - Improved thread-fly-back time from ISRs.
  - Lower RAM usage.
  - Improved syscall support.
  - Support for safer sandboxes 2.0.
  - Support for creation of unprivileged threads.

*** What's new in OS Library 1.3.0 ***

- None.

*** What's new in SB 2.0.0 ***

- Cleaner and easier to use API.
- Safer messages with timeouts.
  
*** What's new in RT 7.0.1 ***

- Improved Virtual Timers:
  - Higher performance.
  - Graceful failure mode for insufficient delta.
  - Better warnings reporting in RFCU unit.

*** What's new in NIL 4.1.1 ***

- Minor internal adjustments.

*** What's new in HAL 8.0.0 ***

- Support for return codes from all xxxStart() functions.
- New SPIv2 driver model with masted and slave support.

*** What's new in EX 1.2.0 ***

- None.

*** What's new in AVR HAL support ***

- None.

*** What's new in STM32 HAL support ***

- SPIv2 support for all sub-families. SPIv1 still available as fallback.
- EFL driver and demo for STM32F3xx.
- Support for STM32G031, STM32G041, STM32G0B1, STM32G0C1.

*** What's new in tools ***

- None.