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Update release note about RTEMS 5 support

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Brendan Chandler
2021-03-24 13:06:18 -05:00
parent af2d4de942
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documentation/RELEASE_NOTES.md
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@@ -18,29 +18,44 @@ should also be read to understand what has changed since earlier releases.
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### Support for RTEMS 5
### Experimental Support for RTEMS 5
The new major release of the RTEMS real-time OS contains many changes
including the ability to support SMP systems. The earlier EPICS
support for RTEMS made use of various RTEMS-specific kernel APIs which
cannot be used on an SMP system, so the changes here required a
completely new port to the Posix real-time APIs that RTEMS-5 now
recommends.
including the ability to support SMP systems and support for several
new targets:
- RTEMS-beagleboneblack
- RTEMS-pc686
- RTEMS-qoriq_e500
- RTEMS-xilinx-zynq-a9_qemu
- RTEMS-xilinx_zynq_zedboard
The earlier EPICS support for RTEMS made use of various
RTEMS-specific kernel APIs which cannot be used on an SMP system, so
the changes here required a completely new port to the Posix
real-time APIs that RTEMS-5 now recommends.
A new RTEMS configuration variable RTEMS_VERSION has been added which
should be set to the OS version number, e.g. 4.9. When this is 4.12 or
greater, true for 5.0 as well, the new libCom/osi/os/RTEMS-posix
source files will be used; the older API source files can now be found
in libCom/osi/os/RTEMS-kernel, and those which are common to both
installations are in libCom/osi/os/RTEMS. The compiler options are
read from the Makefile.inc of the corresponding BSP and set in the
configuration files. It checks that the BSP was also built with the
--enable-posix option. It also checks if the BSP was built with the
legacy stack or libbsd.
should be set to the OS version number, e.g. 4.9. When this is 4.12
or greater, true for 5.1 as well, the new libCom/osi/os/RTEMS-posix
source files will be used; the older API source files can now be
found in libCom/osi/os/RTEMS-kernel, and those which are common to
both installations are in libCom/osi/os/RTEMS. The compiler options
are read from the Makefile.inc of the corresponding BSP and set in
the configuration files. It checks that the BSP was also built with
the --enable-posix option. It also checks if the BSP was built with
the legacy stack or libbsd.
The dependency on bspExt has been removed. RTEMS 5 provides the bus
support natively now.
Known Issues:
- MVME2100, MVME167, and uC5282 have not yet been updated to compile for RTEMS 5.
- VMEBus support is not available for all powerpc BSPs.
- There are some known issues with floating point on MVME2500
- Changed network driver for beatnik to work with libbsd. Some
issues with DHCP, but network stack usable. Can load env from
NVRAM.
RTEMS5 brings support for new targets including:
RTEMS-beagleboneblack, RTEMS-pc686, RTEMS-qoriq_e500,
RTEMS-xilinx-zynq-a9_qemu, RTEMS-xilinx_zynq_zedboard
### Priority inversion safe posix mutexes