Upgrading to latest fw on iPod 5.5 broke rockbox loading

[exitwounded]

So for the past few hours I have been trying to figure out why, but after upgrading to 4.0, rockbox no longer loads with the error "Can't load rockbox.ipod" - but it does exist. I do not see a splash screen, it jumps straight to this error.

folder structure: https://i.imgur.com/YSJHE3q.png
root structure: https://i.imgur.com/ucPjpEM.png
ipod error: https://i.imgur.com/4OiSPKd.jpeg

And thankfully, I had taken a backup of the .rockbox folder beforehand, and rename my .old-rockbox to .rockbox it works fine.

folder structure of the old version that is working: https://i.imgur.com/gIXPj57.png

I'm really at a loss - I have no idea why it just doesn't work. I've removed and reinstalled the bootloader several times, cleaned up the .rockbox folder that doesn't work and even manually installed it and it's all the same.

Thanks in advance!

[saratoga]

The number of sectors in the partition being a negative number sounds bad

Is there some older version that would talk to your flash adapter? 

[exitwounded]

The number of sectors in the partition being a negative number sounds bad

Is there some older version that would talk to your flash adapter?

Oh wow I didn't even notice the negative number lol

Yep - dev build b3e6b12266-240619 is what I am currently able to run, which was one of the dev builds from last year (judging by timestamp in the version June 19th last year) and it works perfectly.

[speachy]

ipod error: https://i.imgur.com/4OiSPKd.jpeg

Ignore the negative number, that's due to printing a large unsigned number as unsigned.

What I'd like to see is a partition table dump, ideally though use of fdisk.   As an alternative, grab the latest daily build and try again; it will show more information on the error screen.

(Modern rockbox is stricter in some ways, and laxer in other ways, in its ability to mount a filesystem.  It's really important to identify what is going wrong here)

[exitwounded]

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tai•~» sudo fdisk -l /dev/sdd                                                                                                                                                                  [14:41:48]
Disk /dev/sdd: 1.87 TiB, 2050846883840 bytes, 1001390080 sectors
Disk model: iPod           
Units: sectors of 1 * 2048 = 2048 bytes
Sector size (logical/physical): 2048 bytes / 2048 bytes
I/O size (minimum/optimal): 2048 bytes / 2048 bytes
Disklabel type: dos
Disk identifier: 0x20202020

Device     Boot Start        End    Sectors  Size Id Type
/dev/sdd1          63      48194      48132   94M  0 Empty
/dev/sdd2       48195 1001390078 1001341884  1.9T  b W95 FAT32


I can reformat if needed - but I'd prefer not to obviously, just takes a long time to re-load and I use this daily. Also - I was going to give you a picture of the latest dev build (4/25 build) screen too, but it looked the same as the other screen.

[speachy]

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Device     Boot Start        End    Sectors  Size Id Type
/dev/sdd1          63      48194      48132   94M  0 Empty
/dev/sdd2       48195 1001390078 1001341884  1.9T  b W95 FAT32


This should be type 'c' (ie FAT32 LBA).  type 'b' is supposed to only be used for (max 24-bit!) CHS-based addressing (which nonsensical for a ~2TB partition)

There's nothing in rockbox that specifically checks for type 'c', so I expect something is being set up differently in the filesystem itself.

I don't expect simply changing it to matter without reformatting afterwards (as rockbox tries to mount it regardless of the type) but you're welcome to try.