RTAI 5.3.3 GNU11 for LinuxCNC

DO NOT MIX 4.19 AND 5.4 DEBIAN PACKAGES!
ONLY HAVE EITHER 4.19 OR 5.4 PACKAGES INSTALLED AT A TIME!

Initial GNU11 support
Debian kernel configs untouched

DO NOT MIX 4.19 AND 5.4 DEBIAN PACKAGES!
ONLY HAVE EITHER 4.19 OR 5.4 PACKAGES INSTALLED AT A TIME!

RTAI 5.3.3 Delta release for LinuxCNC

DO NOT MIX 4.19 AND 5.4 DEBIAN PACKAGES!
ONLY HAVE EITHER 4.19 OR 5.4 PACKAGES INSTALLED AT A TIME!

Initial 5.4 kernel support
Kconfig improvements for 4.19 kernel

Manual kernel config changes in Debian packages:

CONFIG_HZ_300=y
CONFIG_IO_DELAY_NONE=y

DO NOT MIX 4.19 AND 5.4 DEBIAN PACKAGES!
ONLY HAVE EITHER 4.19 OR 5.4 PACKAGES INSTALLED AT A TIME!

RTAI 5.3.3 Beta release for LinuxCNC

More aggressive kernel 4.19 Kconfig tweaks
Re-written FPU save/restore functions
Needs testing on other hardware, especially Intel

Manual kernel config changes in Debian package:

CONFIG_HZ_300=y
CONFIG_IO_DELAY_NONE=y
CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_64B=y

RTAI 5.3.2 release for LinuxCNC

Various important updates:

Update kernel patch (4.19.257)
Update musl (1.2.3)
Make musl code easier to maintain (Preserve some if statements)
Use x86_64 versions of fabs and sqrt (less LOC and faster?)
Re-bootstrap on Debian Bullseye
Lots of documentation improvements
Fix musl build on modern systems (Disable some errors, still more paranoid than upstream musl)
Backport CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_64B

Tested with LinuxCNC 2.9.0~pre0 (master branch)

RTAI 5.3.1 release for LinuxCNC

Based off of the newly released RTAI 5.3 tarball
Linux kernel 4.19.195 support (IPIPE 4.19 core release 18)
Now supports up to 32 cores

RTAI 5.2.3 release for LinuxCNC

Stable RTAI 5.2.3 release for LinuxCNC

Final RTAI 4.9.9 release

This will be the last release of the RTAI 4 branch.
The 3.10 and 3.18 kernels have reached EOL, and the
3.16.53 kernel has introduced assembly changes that are
too complicated for me to work around.

All future development will now be focused on RTAI 5,
with performance improvements and clean-ups as always.

Special thanks to jepler and seb_kuzminsky!

Nothing left to do.