An additional idea:
perhaps the system can run in one of of these new non volatile RAMs
(ferro and competing technologies).
This should provide really instant on.
Of course after power on some hardware devices will need some
initialization.
-Michael
On Feb 25, 2008, at 3:20 AM, Michael Schnell wrote:
An additional idea:
perhaps the system can run in one of of these new non volatile RAMs
(ferro and competing technologies).
Core.
-
allon
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Did you take
a look at my fastram patch? It allows to move cpu intensive kernel
functions into the internal ram, so that they are executed much faster
than from flash or external ram (typically 4x -10x faster!!).
Sounds GREAT !
Does this need XIP ? I maybe would like to use this with NIOS
Am Montag, den 18.02.2008, 11:55 +0100 schrieb Michael Schnell:
Did you take
a look at my fastram patch? It allows to move cpu intensive kernel
functions into the internal ram, so that they are executed much faster
than from flash or external ram (typically 4x -10x faster!!).
Sounds
Am Montag, den 18.02.2008, 13:07 +0100 schrieb Michael Schnell:
no, you can use it with XIP or non-XIP kernels. You just have to modify
the kernel's ld script so that there is a new fastram section.
Sounds really good !
The kernel startup code must copy __fastram_image to
If your cpu uses a cache, don't expect too much speedup.
With ISRs the cache does not help, but fast ram should reduce the
latency greatly
But it's worth
to try for sure, and I'd be courious to hear about your results!
Right now I not even have any hardware to play with. So it will be
Am Donnerstag, den 14.02.2008, 07:55 -0700 schrieb Robert Warner:
Eriwn,
I was afraid that you are thinking about boot times in the msec range. I
have got ~1sec boot time with a 40MHz Atmel AT91 board just with using
XIP for kernel + applications. In addition, I had to take out the HW
Erwin,
I was afraid that you are thinking about boot times in the msec range. I
have got ~1sec boot time with a 40MHz Atmel AT91 board just with using
XIP for kernel + applications. In addition, I had to take out the HW
reset for PCMCIA that was done with a ~0.5sec delay. The delay loop
Hi Bob,
what is the boot time that you require? With a few optimization tricks
like making the kernel XIP from flash and using a patch from celinux to
speed up the delay loop calibration you can easily get boot times of a
few 100 msecs, depending on your cpu horsepower.
Regards,
Erwin
Am
Erwin,
Now this is what i'd like to here. Less then 1 sec for startup time
would be absolutely perfect. This device is a hand held radio. The
people using these radios are used to typical analog radios, which at
power on are ready to go immediately. A less then one second boot and
Bob,
I was afraid that you are thinking about boot times in the msec range. I
have got ~1sec boot time with a 40MHz Atmel AT91 board just with using
XIP for kernel + applications. In addition, I had to take out the HW
reset for PCMCIA that was done with a ~0.5sec delay. The delay loop
calibration
Eriwn,
I was afraid that you are thinking about boot times in the msec range. I
have got ~1sec boot time with a 40MHz Atmel AT91 board just with using
XIP for kernel + applications. In addition, I had to take out the HW
reset for PCMCIA that was done with a ~0.5sec delay. The delay loop
Jamie,
Now this is what i'd like to here. Less then 1 sec for startup time
would be absolutely perfect. This device is a hand held radio. The
people using these radios are used to typical analog radios, which at
power on are ready to go immediately. A less then one second boot and
Hi Bob,
Jamie Lokier wrote:
Robert Warner wrote:
Now this is what i'd like to here. Less then 1 sec for startup time
would be absolutely perfect. This device is a hand held radio. The
people using these radios are used to typical analog radios, which at
power on are ready to go
Greg,
Greg Ungerer wrote:
Jamie Lokier wrote:
Robert Warner wrote:
As a reference point, our early ColdFire based snapgear
routers booted in around 1s (from power on to shell prompt/login).
That wasn't tweaked in any special way either. (Those units where
reasonably fast CPU 66MHz with
Hi
I'm looking into the prospect of preloading all of the necessary tables
for applications and kernel such that when the device is turned on it
doesn't boot it just starts executing as if it had already gone through
all the booting and application(s) initialization(s). Has this aspect
of
Hi Bob,
Robert Warner wrote:
I'm looking into the prospect of preloading all of the necessary tables
for applications and kernel such that when the device is turned on it
doesn't boot it just starts executing as if it had already gone through
all the booting and application(s)
Quoth Robert Warner:
I'm looking into the prospect of preloading all of the necessary tables
for applications and kernel such that when the device is turned on it
doesn't boot it just starts executing as if it had already gone through
all the booting and application(s) initialization(s). Has
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