QNX processes are spawned at a memory locations < 4GB by default. This is because many drivers are using 32bit DMA points and many applications are not tested in a configuration with > 4GB.
To enables extended addressing run startup-* with -x. This lets you access physical addresses above 4 GB. Selective applications that are known to work with 64bit addresses can be spawned with the SPAWN_PADDR64_SAFE flag. Or with on -P from command line.
Note: the devb- driver (io-blk) uses 15% of the RAM for the cache by default. This should be adjusted for a system with lots of memory.
NOTE:
This entry has been validated against the SDP version listed above. Use
caution when considering this advice for any other SDP version. For
supported releases, please reach out to QNX Technical Support if you have any questions/concerns.
Please contact us with your questions or concerns.
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