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doc: Adds initial blurb about partitions.
This commit is contained in:
Samuel Dionne-Riel
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b5fe8b8807
52
devices/asus-flo/partitions_16GB.gdisk
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52
devices/asus-flo/partitions_16GB.gdisk
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GPT fdisk (gdisk) version 1.0.3
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Partition table scan:
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MBR: protective
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BSD: not present
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APM: not present
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GPT: present
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Found valid GPT with protective MBR; using GPT.
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Command (? for help): Disk /dev/mmcblk0: 30785536 sectors, 14.7 GiB
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Sector size (logical/physical): 512/512 bytes
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Disk identifier (GUID): 00000000-0000-0000-0000-000000000000
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Partition table holds up to 32 entries
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Main partition table begins at sector 2 and ends at sector 9
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First usable sector is 34, last usable sector is 30785502
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Partitions will be aligned on 2-sector boundaries
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Total free space is 1526010 sectors (745.1 MiB)
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Number Start (sector) End (sector) Size Code Name
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1 131072 306143 85.5 MiB 0700 radio
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2 393216 399359 3.0 MiB FFFF modemst1
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3 399360 405503 3.0 MiB FFFF modemst2
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4 524288 554287 14.6 MiB 8300 persist
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5 655360 656919 780.0 KiB FFFF m9kefs1
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6 656920 658479 780.0 KiB FFFF m9kefs2
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7 786432 787991 780.0 KiB FFFF m9kefs3
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8 787992 794135 3.0 MiB FFFF fsg
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9 917504 920503 1.5 MiB FFFF sbl1
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10 920504 923503 1.5 MiB FFFF sbl2
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11 923504 927599 2.0 MiB FFFF sbl3
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12 927600 937839 5.0 MiB FFFF aboot
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13 937840 938863 512.0 KiB FFFF rpm
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14 1048576 1081343 16.0 MiB FFFF boot
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15 1179648 1180671 512.0 KiB FFFF tz
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16 1180672 1180673 1024 bytes FFFF pad
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17 1180674 1183673 1.5 MiB FFFF sbl2b
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18 1183674 1187769 2.0 MiB FFFF sbl3b
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19 1187770 1198009 5.0 MiB FFFF abootb
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20 1198010 1199033 512.0 KiB FFFF rpmb
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21 1199034 1200057 512.0 KiB FFFF tzb
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22 1310720 3031039 840.0 MiB 8300 system
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23 3031040 4177919 560.0 MiB 8300 cache
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24 4194304 4196351 1024.0 KiB FFFF misc
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25 4325376 4345855 10.0 MiB FFFF recovery
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26 4456448 4456463 8.0 KiB FFFF DDR
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27 4456464 4456479 8.0 KiB FFFF ssd
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28 4456480 4456481 1024 bytes FFFF m9kefsc
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29 4587520 4587583 32.0 KiB FFFF metadata
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30 4718592 30785502 12.4 GiB 8300 userdata
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Command (? for help):
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68
devices/asus-z00t/partitions_16GB.gdisk
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68
devices/asus-z00t/partitions_16GB.gdisk
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GPT fdisk (gdisk) version 1.0.3
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Partition table scan:
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MBR: protective
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BSD: not present
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APM: not present
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GPT: present
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Found valid GPT with protective MBR; using GPT.
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Command (? for help): Disk /dev/mmcblk0: 30785536 sectors, 14.7 GiB
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Sector size (logical/physical): 512/512 bytes
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Disk identifier (GUID): 00000000-0000-0000-0000-000000000000
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Partition table holds up to 48 entries
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Main partition table begins at sector 2 and ends at sector 13
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First usable sector is 34, last usable sector is 30785502
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Partitions will be aligned on 2-sector boundaries
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Total free space is 43820 sectors (21.4 MiB)
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Number Start (sector) End (sector) Size Code Name
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1 34 2593 1.3 MiB FFFF sbl1
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2 2594 5153 1.3 MiB 0700 sbl1bak
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3 5154 6177 512.0 KiB FFFF rpm
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4 6178 7201 512.0 KiB 0700 rpmbak
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5 7202 8225 512.0 KiB FFFF tz
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6 8226 9249 512.0 KiB 0700 tzbak
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7 9250 10273 512.0 KiB FFFF hyp
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8 10274 11297 512.0 KiB 0700 hypbak
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9 11298 11361 32.0 KiB FFFF DDR
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10 11362 11377 8.0 KiB FFFF ssd
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11 11378 11409 16.0 KiB FFFF sec
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12 11410 21649 5.0 MiB FFFF aboot
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13 32768 43007 5.0 MiB 0700 abootbak
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14 43008 53247 5.0 MiB FFFF splash
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15 53248 55295 1024.0 KiB FFFF devinfo
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16 65536 68607 1.5 MiB FFFF fsg
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17 68608 68609 1024 bytes FFFF fsc
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18 68610 71681 1.5 MiB FFFF modemst1
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19 71682 74753 1.5 MiB FFFF modemst2
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20 74754 95233 10.0 MiB FFFF factory
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21 95234 115713 10.0 MiB FFFF factorybak
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22 115714 117761 1024.0 KiB FFFF asuskey
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23 117762 119809 1024.0 KiB FFFF asuskey2
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24 119810 121857 1024.0 KiB FFFF asuskey3
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25 121858 123905 1024.0 KiB FFFF asuskey4
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26 123906 125953 1024.0 KiB FFFF asuskey5
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27 125954 128001 1024.0 KiB FFFF asusgpt
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28 128002 130049 1024.0 KiB FFFF asusgpt1
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29 130050 132097 1024.0 KiB FFFF asusgpt2
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30 132098 134145 1024.0 KiB FFFF misc
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31 134146 135169 512.0 KiB FFFF keystore
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32 135170 135233 32.0 KiB FFFF config
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33 135234 200769 32.0 MiB FFFF asdf
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34 200770 204865 2.0 MiB FFFF abootdebug
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35 204866 206913 1024.0 KiB FFFF persistent
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36 229376 294911 32.0 MiB FFFF oem
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37 294912 360447 32.0 MiB FFFF boot
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38 360448 425983 32.0 MiB FFFF recovery
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39 425984 491519 32.0 MiB FFFF persist
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40 491520 524287 16.0 MiB FFFF asusfw
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41 524288 655359 64.0 MiB 0700 modem
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42 655360 720895 32.0 MiB 0700 ADF
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43 720896 1146879 208.0 MiB 0700 APD
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44 1146880 1212415 32.0 MiB FFFF cache
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45 1212416 7503871 3.0 GiB FFFF system
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46 7503872 30785502 11.1 GiB FFFF userdata
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Command (? for help):
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66
doc/partitions.md
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66
doc/partitions.md
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Partitions
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==========
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Right now, we will **not** touch any partition map.
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This is because it may break devices.
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Some (all?) android devices keep a small bit of their internal storage aside to put
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secondary bootloaders in.
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When the storage is cleared, or their bootloaders stored therein are corrupt, many devices will
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boot to a proprietary download mode. Follows a random picking of links related.
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* https://forum.xda-developers.com/g2-mini/general/hard-bricked-help-via-aboot-img-abootb-t3212609
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* https://forum.xda-developers.com/android/development/qd-9008-fix-tested-lg-v410g-pad-7-0-att-t3269057
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* https://forum.xda-developers.com/showpost.php?p=75360854&postcount=199
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* https://forum.xda-developers.com/nexus-7-2013/nexus-7-2013-qa/fix-nexus-7-2013-bricked-stuck-t3310608
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It may be possible to recover, but this is highly device-dependent... and spooky.
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Here's an example guide from a user that re-partitions their device:
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* https://forum.xda-developers.com/nexus-7-2013/general/guide-repartition-nexus72013-to-t3599907
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* * *
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Generating a partitions listing
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-------------------------------
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By adding this to `local.nix`, build an initramfs for your device and boot it.
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```
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mobile.boot.stage-1.extraUtils = with pkgs; [
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gptfdisk
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];
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```
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Run this command:
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```
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adb shell "echo p | gdisk /dev/mmcblk0" > devices/$DEVICE/partitions_$SIZE$UNIT.gdisk
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```
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Where:
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* $DEVICE is the device name
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* $SIZE is the size un $UNIT
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* $UNIT is `GB`, as in GigaBytes
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This will dump everything `gdisk` knows about the partition scheme. Saving it raw will
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allow future tools to re-use the data as dumped to create a better metadata set. It is
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okay if you replace the Disk identifier (GUID) with a string of zeroes. (It is unknown
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if it is truly unique across similar devices.)
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The storage size is included in the filename as some devices (most?) have different
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variants differing only in their storage size.
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* * *
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### See also
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* https://source.android.com/devices/bootloader/partitions-images
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* https://forum.xda-developers.com/general/general/android-partitions-explained-t3657183
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