Hekate: SD card partitions become unreadable in Linux

[westonmyers]

Environment
Distro: Arch
Kernel: 5.1.15
util-linux: 2.34-2
Desktop: KDE Plasma 5.16.2-1

SD card at /dev/sdc; previously showing /dev/sdc1 and /dev/sdc2 under lsblk, etc.
Now though:

lsblk

NAME MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sdc    8:32   1 366.8G  0 disk 

sfdisk -l /dev/sdc

Disk /dev/sdc: 366.84 GiB, 393870311424 bytes, 769277952 sectors
Disk model: USB3.0 CRW   -SD
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x5003b316

Device     Boot     Start       End   Sectors   Size Id Type
/dev/sdc1            2048 705230847 705228800 336.3G  b W95 FAT32
/dev/sdc2       705230848 769271807  64040960  30.6G ee GPT

I was able to use sfdisk to easily edit the partition type of /dev/sdc2 from ee to something more mbr-like, such as type ef, and get back up and running.

sfdisk -d /dev/sdc > table
vim table
sfdisk /dev/sdc < table

lsblk

NAME   MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sdc      8:32   1 366.8G  0 disk 
├─sdc1   8:33   1 336.3G  0 part 
└─sdc2   8:34   1  30.6G  0 part 

sfdisk -l /dev/sdc

Disk /dev/sdc: 366.84 GiB, 393870311424 bytes, 769277952 sectors
Disk model: USB3.0 CRW   -SD
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x5003b316

Device     Boot     Start       End   Sectors   Size Id Type
/dev/sdc1            2048 705230847 705228800 336.3G  b W95 FAT32
/dev/sdc2       705230848 769271807  64040960  30.6G ef EFI (FAT-12/16/32)

The three lines that probably need to be changed.

https://github.com/CTCaer/hekate/blob/e6d1a310452d29b20de0a9b3cb4e0654ca9f1e3f/nyx/nyx_gui/frontend/fe_emummc_tools.c#L565
https://github.com/CTCaer/hekate/blob/e6d1a310452d29b20de0a9b3cb4e0654ca9f1e3f/nyx/nyx_gui/frontend/fe_emmc_tools.c#L74
https://github.com/CTCaer/hekate/blob/e6d1a310452d29b20de0a9b3cb4e0654ca9f1e3f/nyx/nyx_gui/frontend/gui_emummc_tools.c#L279

[ckurtz22]

Yeah, CTCaer is aware of this. The fix is like you said, change those 0xEEs into 0xEF, recompile and upload to SD card, and then remigrate emuMMC

[CTCaer]

Yep, this will be fixed.

[null-device]

Here's a recompiled nyx.bin with the changes above:

nyx.bin.zip

[chillyshackk]

Thank you for this, will try this now, I was wondering what was going on with the partitions and ended up retrying on 3 different sd cards..!

[chillyshackk]

Worked perfectly thanks! Uploaded the bin via ftpd, booted in hekate/nyx, pressed migrate emuMMC, tested that it still worked then I put the card back on my pc and the partitions were there!

[CTCaer]

FYI: This also breaks Lakka and L4T ubuntu.
Basically whatever needs the "boot" partition and it's Linux based.

[JakeTripplJ]

Another way to make the partitions visible in Linux is to use parted's rescue function. For example, all I had to do was
parted /dev/mmcblk0 (or whatever your SD card is recognized as)
and then
rescue
at the next prompt. When it asks for start and end points, I just had it scan the entire card. It found the FAT32 partition almost instantly and I was able to use it normally after that. The rest of the SD card shows up as unallocated, but I labeled it as a RAW partition just so I don't accidentally overwrite anything.

If the above commands don't work by themselves, a
mklabel msdos
before the rescue command (while in parted) should help, but theoretically it shouldn't be required.

[westonmyers]

Rescuing requires more input, takes a ton of time (Comparatively), and is completely unnecessary. You _can_ do it, but there's no reason to do so in this context. The partition table is "fine." It's not as though the partition table is corrupt or what-have-you. Offsets are correct, etc. The partition type just needs to be swung.

[CTCaer]

Partitions are now marked as E0
Running migrate will fix them.