Linux seamless booting
matteo.fortini at mta.it
Mon Oct 12 22:07:28 EST 2009
we've been working on a PPC512x board booting with u-boot + linux
18.104.22.168, and one major issue for our application is boot time.
Right now, we went down to less than 6s boot time (i.e. time from power
off to launch of the user app), even with some drivers installed, i.e.:
* CAN bus
* GPU on PCI bus
* USB host
with r/o squashfs root and r/w ubifs configuration filesystem mounted
from a NOR flash memory.
This time could be enough for the high-level application (we're showing
a splash screen in about 2-3s so it's ok if the main app takes a little
longer to come up), but the whole system is connected to others via CAN
and we can't afford the "black out" period between u-boot and linux.
Some other operating systems (e.g. QNX) have this "seamless booting"
function, in which drivers are started in stages, so that a (minimal)
functionality can be given in milliseconds, and more functionalities
come up as time goes by.
Is there a way to support something similar with the u-boot -> linux
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