51 lines
2.2 KiB
Groff
51 lines
2.2 KiB
Groff
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NuttX-6.1
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---------
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The 68th release of NuttX, Version 6.1, was made on April 10, 2011
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and is available for download from the SourceForge website. The
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6.0 release introduced a detach-able application environment to
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build applications outside of the NuttX source tree. The primary
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purpose of this release is to correct numerous build problems
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introduced by that architectural change:
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* In many newer environments, NuttX produced strange Makefile
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errors but built correctly in older environments. A fix provided
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by Rafael Noronha was incorporated and is reported to fix those
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build problems.
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* The apps/ directory build system would not handle Windows-native
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toolchains due to obscure path formatting issues.
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* And other problems as detailed in the Changelog.
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Many additional changes were made in the 6.1 release for another
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major architectural change: NuttX will now build as a separately
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linked microkernel. In this build option the RTOS builds as a
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kernel, applications build separately and interface with kernel via
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system calls. Applications run in user mode and kernel logic users
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in kernel-mode. This provides a secure environment for NuttX. This
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feature is fully coded in NuttX-6.1, but has not been tested due
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to higher priority tasks that have arisen.
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Related to this change, support for the Cortex-M3 memory protection
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unit (MPU) has been integrated with the NuttX kernel build to provide
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an even higher level of security.
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NOTE: This kernel build is an option; the default build configuration
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is still the standard, flat, unsecured RTOS as in previous releases.
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Additional new features in this release:
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* Support for LPC17xx GPIO interrupts (with much support from
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Decio Renno).
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* Basic timer support for STM32 (Contributed by Uros Platise)
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* A binfs file system. This is a tiny pseudo file system that
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lets named applications to be viewed and accessed in NSH under
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the /bin directory.
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* An I2C-based driver for the LIS331DL MEMS motion sensor.
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(Contributed by Uros Platise.)
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* A configuration for the Embedded Artists LPCXpresso LPC1768 board.
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* The user_initialize() interface has been removed.
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And several bugfix associated with SD drivers, opendir(), signed
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8-bit types (int8_t), and USB serial device. See the ChangeLog for
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details.
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