Thread: Compiling custom kernels for P1.1 (with fiasco-gen)
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nightfire is offline nightfire
2010-04-18 , 22:43
Posts: 310 | Thanked: 383 times | Joined on Jan 2010
#252
Originally Posted by titan View Post
rebooted while playing mp3s...
Yeah, I just noticed this too.

Actually, it's related to the DSP. When the DSP is busy (ie. during splash screen, playing videos, and MP3s (I guess)), it either starves the CPU, or shares vdd1 with it, and undervolts. If you're able to check the dmesg buffer, you can see DSP sync errors when it happens.

Here are my new values that appear to be stable while playing video:

Code:
20 20 25 30 35 38 43 45 48 51 54 56 60 65 72
Interestingly enough, the CPU enters sleep state during video playback, so the first voltage is critical. While it's otherwise stable with 15 as the first value, it locks almost immediately while playing video. It makes sense, I guess.

The main problem was voltage too low at 250 and 500mhz.

I don't think we can do better than this for ultra ultra low voltage.
Last edited by nightfire; 2010-04-18 at 22:50.
 

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