OMAP 4460 based pandas run too hot at current operating point
Bug #867670 reported by
John Rigby
This bug affects 1 person
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
u-boot-linaro (Ubuntu) |
Fix Released
|
High
|
John Rigby | ||
Bug Description
With both A9 cores loaded 4460 reaches max temperature in about 30s at the current operating point of 930MHz. The operating point should be lowered to 700MHz.
SRU Info:
This bug affects all 4460 based panda and blaze platforms.
Test case is to boot a 4460 based panda and run a something that pegs both cpus.
The fix is in upstream git.linaro.org (comment #2). This fix has been tested and shown to fix the problem with no regression (comment #4 and #5).
description: | updated |
description: | updated |
Changed in u-boot-linaro (Ubuntu): | |
assignee: | nobody → John Rigby (jcrigby) |
Changed in u-boot-linaro (Ubuntu): | |
importance: | Undecided → High |
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From Sebastien Jan:
It appears the panda heats more than I thought (and much more that the blaze), and by loading the 2 cores I can quite easily reach max temperature at 920MHz (it takes around 30s on my board!).
At 700MHz, the temperature still increases but much slower. So if the A9 cores do not run at 100% all the time we shall be ok.
So for now, we definitely need this change if we don't want to run with a heatsink...