Thread: PRS-650 sony prs-650 processor
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Old 09-28-2010, 08:26 PM   #11
igorsk
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Quote:
Originally Posted by fyre182 View Post
Igorsk

can you confirm the 260 mhz ? why is the processor underclocked so much? The native speed for that processor is 532 mhz i believe with 133 mhz multipliers. It seems that the touchscreen is draining a lot of battery
From the dmesg:
Code:
CPU is i.MX31 Revision 2.0
Clock input source is 26000000
It's possible that it's not the actual CPU clock speed. The CPU has DVFS (dynamic voltage and frequency scaling) so it can run at varying speeds. Here's the output of cat /sys/devices/system/dvfs/dvfs0/status for PRS-900:
Code:
DVFS is enabled
clock = [266000000Hz]
UP:     0       1       1       5
DOWN:   8       7       6       0
Update 532MHz(7) 399MHz(8) 266MHz(13) 133MHz(0)
intr fsvai-err:0 wrong-err:0
(I don't have a 350/650 right now to compare)

Quote:
Originally Posted by EatingPie View Post
I just used the wiki to look up the PRS-600.
"Freescale i.MX31L (ARM1136JF-S core, 532MHz)."
That makes the PRS-650 half the speed of the PRS-600! That cannot be right.
-Pie
The CPU is rated 532MHz. It doesn't mean it's running at that speed all the time.
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