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Fix for handling of device driver buffer creation call
Robert Sprowson authored 
PRM 2-612 says the device driver can modify R3-R6 during buffer creation in order to change the buffer creation parameters used with BufferManager.
However, the subsequent logic in DeviceFS meant that if the buffer already existed the flags (R3) never got used.
In practice this only affects the magic buffer numbers 0-9 retained for BBC Micro compatibility (Keyboard/Serial in/Serial out/Printer/Sound 0-3/Speech/Mouse), and of those only Serial & Parallel are in DeviceFS, and of those Parallel had a workaround, so really only the SerialDeviceDriver gains a fix here.

Tested in an IOMD ROM.

Version 0.72. Tagged as 'DeviceFS-0_72'
54e89e2f
Name Last commit Last update
Doc Added new IOCTL reason codes and special field flags for sleeping devicefs.
Resources Added new IOCTL reason codes and special field flags for sleeping devicefs.
Test Import from cleaned 360 CD
hdr Version Spin_merge taken
rm Import from cleaned 360 CD
s Fix for handling of device driver buffer creation call
.gitattributes Import from cleaned 360 CD
BlackLog Initial revision
LICENSE Import from cleaned 360 CD
Makefile Updated build structure to use the shared AAsmModule makefile.
MkClean,fd7 Updated build structure to use the shared AAsmModule makefile.
MkRom,fd7 Removed -throwback from ASFLAGS
MkSA,fd7 Removed -throwback from ASFLAGS
Version DeviceFS wouldn't build
VersionASM Fix for handling of device driver buffer creation call
VersionNum Fix for handling of device driver buffer creation call