ATA error: -2 at boot after updating Sansa Clip+ (dev builds)

[qorx]

Hi,
I'm unable to update my Clip+ from several builds back.
After updating either manually or with rbutil, an ATA error: -2 is shown in rolo. Latest builds all give same error so I reverted to the one I had as backup: c90d42d-160408 which runs fine.
This happens even with all default settings set.
Formatted, checked for file system errors and reinstalled everything again but nothing seems to get past the boot error unless reverting..

If I update to the latest build and replace "Rockbox.sansa" file with the one from my backup, it starts normally, no error shown.

saratoga said in irc that I'm the first to report this error, so as he suggested here's the forum topic.

[saratoga]

I believe ATA error -2 just means that the storage couldn't be read.  This is likely due to the recent changes to voltage and frequency scaling.

What was the oldest build you tried that did not work? 

[qorx]

All builds from here: http://www.rockbox.org/dl.cgi?bin=sansaclipplus did not work, so I gave up and installed my backup but it seems that it was around May because the one I have is from 160408 and I've another from 160414 that also runs fine.
If you can get me some builds prior to the ones in that page, I can test more if you want.

[saratoga]

We don't have download links for old builds, they must be compiled.  Post the build number for the last build that worked correctly.

[johnb]

Hi,

here is the build that has all the voltage and frequency scaling (rockbox-sansaclipplus.18fecd9.zip  160422). All of my clip+es work fine with it.
https://app.box.com/s/tbii7up8i2btfgegqc3g624igv6yjx4n

Regards
johnb

[qorx]

saratoga, the last one that works in my Clip+ is: c90d42d-160408
johnb, thanks for the build upload, unfortunately the same error is shown with that build too.

[saratoga]

The only substantial change between those builds is that we enabled voltage scaling, so here is the current git but with voltage scaling disabled:

http://mit.edu/mgg6/www/rockbox-c7a561e-noVoltage-clip+.7z

[qorx]

That one runs fine, thanks for compiling it. So it must be something with voltage scaling in my player.
How can I help debug?

[Mihail Zenkov]

saratoga: I think we should try slightly rise (48 - 50) CVDD1 at boost. If it help we can add special case for clip+ as we already have for clip zip at normal freq.

[saratoga]

Here is a build with voltage scaling enabled but a slightly higher boost voltage:

http://mit.edu/mgg6/www/rockbox-clipplus-49-voltage.7z

[qorx]

Here is a build with voltage scaling enabled but a slightly higher boost voltage:

http://mit.edu/mgg6/www/rockbox-clipplus-49-voltage.7z

Same error as before

[saratoga]

Here is a build with the unboosted voltage register increased from 22 to 25:

http://mit.edu/mgg6/www/rockbox-clipplus-25-voltage.7z

By the way, if you have a smartphone could you load a working build without voltage scaling, go to System -> Debug -> View IO Ports and then hit down until you see the screen with "CVDD2" on it and take a picture?  I'm curious if your player has similar voltages as mine does. 

[qorx]

That seems to fix it as it runs without any error anymore.
The "CVDD2" value fluctuates between 2705 and 2720

[saratoga]

Can you try this one as well?

http://mit.edu/mgg6/www/rockbox-clipplus-23-voltage.7z

Your voltages look identical to mine at least.

Edit:  If that fails, here is 24:

http://mit.edu/mgg6/www/rockbox-clipplus-24-voltage.7z

Lower will use less power, so its worth finding the minimum. 

[qorx]

23-voltage is running ok, it gives an estimated 26h of battery Thank you!
I've tried 24 as well and it displayed 25h...

If the voltages are identical to yours, what may be causing the error on mine with a lower value? Any idea?