Hi,
Am 14.11.2016 um 12:26 schrieb Michael Mrozek EvilDragon@openpandora.org:
Am Mon, 14 Nov 2016 12:19:35 +0100 hat "H. Nikolaus Schaller" hns@goldelico.com geschrieben:
Hi,
Good news! As adding multiple frequencies made my board run stable with a 1,25GHz as well (even though it never worked with anything higher than 1,8GHz before), maybe this can help.
If you don't get it fully working today I can do some more experiments tonight as well.
I will write a patch for the 1.35V setting and will update the kernel to letux-4.9-rc5 today that it will include this fix. So you should be able to run your tests on top of it.
BTW: Is it worth checking other voltages of the PALMAS as well or is the rest just common stuff that should be the same for us as for the EVM?
Well, everything should be the same :) But double checking is always good. As soon as I have finished the schematics PDF it is easier to do such a review.
I will try to set this to 1350000.
Result: 4GB CPU now reliably (as far as 3 boot attempts can tell) boots at 1.25GHz. And 2GB CPU as well...
I should note for the readers that I have only configured 2GB and do not use LPAE yet.
The new letux-4.9-rc5 will contain an (almost) automatically generated letux_lpae_defconfig so that it should become easier to switch.
So it looks as if we have found one important factor.
Is not a hardware but a software bug. Although nobody did believe me :)
Anyways, only the next onion shell has been opened since it does freeze after 6-8 seconds @ 1.5GHz...
Since the DRAM is capable of handling 1.5V we have now a new tool to check if the 1.5Ghz problem is also coming from the DRAM.
Ok, setting SMPS6 to 1.5V does not change anything at 1.5Ghz. So like I described there is another problem behind this onion shell. Maybe this time it is really an hardware (capacitor) issue.
BR, Nikolaus
-- Mit freundlichen Grüßen,
Michael Mrozek
OpenPandora GmbH Geschäftsführer: Michael Mrozek
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