Definitely. Best way is a custom OS image, see articles on qdn.qnx.com:
Making Buildfiles for the QNX® RTOS Part 1
Once you’ve a custom boot process that knows exactly what hardware to
startup, you may want to tinker with the bootloaders which have inbuilt
delays; this isn’t for the faint-hearted, though:
The article applies to QNX 4.x, but you can still find the signatures in the
QNX 6.x bootloaders. (UK QNX support tell me that they’re about to release
the source for these.). Basically, the short answer is that you can make
QNX boot VERY fast indeed. Hope that gives you some idea of the sort of
thing you can do!!
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We are looking to use QNX RTP in a embedded configuration and boot
time is very important. Are there anything we can disable from a
vanilla installation (with gcc) to accelerate the post-POST boot
What do you mean by :vanilla installation (with gcc)"
If you mean the default installation, that is definitely not the
best way to build a embedded configuration. You could
create a custom boot file and startup procedure to remove
any unwanted features.