Faulty playback on Ipod Nano 4Gb 1st Gen

[tvg]

The latest working build:
13990, for IPod Nano 1st gen: http://tinyurl.com/2btboy

Update:
The problem starts from r14004
"Clean up PP502x CPU clock setup code and use the full 80MHz when boosted"


Hi. I'm expierenced RockBox user (Cowon IAudio X5L).
I bought used IPOD Nano 4g and installed Rockbox onto it. I'm almost satisfied, all seemed to work.
But...

MP3 can be played well. FLACs (5th level) play badly or even not play at all. I start to play FLAC and: it plays 5-10 seconds, then skips to next file. Sometimes FLAC plays straight ahead with terrible glitches in headphones. One time I even encountered a message: "bad data at address 000000..." on white screen.

But! Sometimes (i woke up in the morning, the IPOD laid on a desk overnight, untoched, calm) it playd FLAC well! I started FLAC (50 minutes), it played and played well... Then I scrolled and it still played well! The I turned ON CUE support and a bunch of other options and rebooted the RockBox.

Then the playback was broken again.

It seems that with original firmware the playback is OK. Please tell me about more steps I need to investigate the probleb. I think, the Ipod itself is not broken. Thanks.

P. S. It would be great, if it played all the files well. Very good firmware.

[Llorean]

It helps if you give the exact text of the error message, rather than generalizing as it's very important.

Also, it helps if you tell exactly which SVN revision you're using.

[tvg]

I encountered text message only 1 time.
Usually no any messages, just terrible clicks, or usually just skipping to the next tracks.

Often the track is not played at all: it displays sign "Play" (">"), but the time is not counting and no sound.

AND: this was 27.7.2007.
Now I just installed 27.6.2007 - and it's great!

If you, developers, need, I cound use a frame and find, from what date the RockBox on Ipod Nano plays faulty.

[Llorean]

I asked for a specific SVN revision, not a date. There are many builds made each day. Are you saying you used the daily build (which we specifically do not recommend)? We even clearly state in the guidelines that you should be using a CURRENT build before reporting anything. The Daily is *not* current.

[tvg]

SORRY, really I used current build instead of 27.7.2007.

r13860-070712 - no problem.
r14031-070727 - there IS a problem. And it hanged during playback just after I catched SVN number from About menu.

I think the problem is not in FLAC decoder, but in 'disk driver' or with memory management, because after faulty FLAC playback mp3s are also cannot be normally played.

Now I'm trying to find the daily build, which had introduced this bug.

[Llorean]

I have no problems playing FLAC with 14031. Could you tell me a few things:
1) Have you ever in the history of owning this iPod installed iPL?
2) What firmware version is the Apple OS?

[tvg]

r13961-070723 - NO problems.

In next 15 minutes I will find a daily build which introduced the problem.

1) I just bought a used Ipod, in very good condition. No any history. And I'm also new to IPODs.
2) IPOD OS is 1.3.1.

P. S.: r14019-070727 is already faulty.

[Llorean]

Isolating a specific build is unlikely to help much, as I said, my iPod doesn't have the problems at all. It has something to do with the iPods themselves. There is some difference in the iPods that may be experiencing these problems. My personal current theory is that the newer retail firmware flash bootloader is the cause, but I need more people to answer my questions first.

I suspect you'll find that the problems begin where we start properly handling CPU frequency.

[tvg]

r13990-070726 - no problems.

So the problem starts from r14019-070727.

r13->r14 => problems...

[Llorean]

There are 29 revisions between 13990 and 14019. I don't know what you mean by "r13->r14 => problems...", revisions 13 and 14 are years ago, and if you mean the first two digits, those really are thirteen *thousand*, nine hundred and ninety.

[tvg]

How do I have an access to these 29 revisions?
I used this page: http://www.rockbox.org/dl.cgi?bin=ipodnano

And, of course, I meant thousands digits.

[Llorean]

Every number, 13990, 13991, 13992, 13993, etc, is a different revision, with changes. They're accessible if you check out the source through SVN and compile. Since I'm not having the problem, you're the only person who can isolate this.

[tvg]

I think right now I cannot compile without investigation on how to compile etc...

May be somebody will help me compiling and providing builds?
Oh I know, you all are so busy... If not, I will investigate by myself.

[Chronon]

There are quite good instructions in the wiki on setting up a development environment.  I would recommend the VMWare option as it comes pre-configured.  Search the wiki for VMWare.  There are also wiki pages (UsingSVN, SimpleGuideToCompiling) that should provide the necessary information.  There's also a dedicated forum if you need further help on that.

[soap]

What versions are needed for testing?
I'm stuck in a hotel, might as well build some.

EDIT:  Building
http://rockbox.cleansoap.org/nano
Browse there for all (I believe) relevant builds.
Building still as we speak.  PM me if you want a build I haven't done yet.