Guest opensauce Posted January 15, 2015 Report Share Posted January 15, 2015 Back in 2012 I was involved in telechips device ROM mods and YAFFS file system. I attach android terminal partition output Link to comment Share on other sites More sharing options...
Guest opensauce Posted January 15, 2015 Report Share Posted January 15, 2015 /dev/block/platform/intel/by-label/system /system ext4 ro,seclabel,nosuid,nodev,relatime,data=ordered 0 0 Just need to figure out dd to SD card Link to comment Share on other sites More sharing options...
Guest glossywhite Posted January 16, 2015 Report Share Posted January 16, 2015 The problem here is a "catch 22" - you need root to execute "dd" command to backup the partitions, but if you've rooted, you're therefore not backing up unmodified partitions. I'm not (yet) sure how you'd get around that, unrooted. Link to comment Share on other sites More sharing options...
Guest opensauce Posted January 16, 2015 Report Share Posted January 16, 2015 (edited) The problem here is a "catch 22" - you need root to execute "dd" command to backup the partitions, but if you've rooted, you're therefore not backing up unmodified partitions. I'm not (yet) sure how you'd get around that, unrooted. That is a non issue, basically if you remove any gmail accounts and only backup system image you create a modified sys image. this if correct can be flashed as customised system.(super su can unroot at push of button) the part I'm unsure of is yaffs file system you specify page size, but we are ext4 Normally on yaffs the blocks would be identified with mount partition name and backed up as example dd if=/dev/mtd/mtd2 of=/sdcard/boot.img bs=4096 I'm still uncertain how to see labels as cat /proc/mtd isn't available okay i'm trying terminal as SU cat /dev/block/mmcblk0 > /mnt/media_rw/sdcard1/mmcblk0.img I will them compare the two and if it's pulled exact copy I can do the rest of partitions and go poking around them fails on fat32 limitations https://blog.jplitza.de/2013/07/04/external-sd-card-with-ext4-under-android-cm10-1/ as idea I have full adb shell su Edited January 16, 2015 by opensauce Link to comment Share on other sites More sharing options...
Guest glossywhite Posted January 16, 2015 Report Share Posted January 16, 2015 (edited) That is a non issue, basically if you remove any gmail accounts and only backup system image you create a modified sys image. this if correct can be flashed as customised system.(super su can unroot at push of button) the part I'm unsure of is yaffs file system you specify page size, but we are ext4 Normally on yaffs the blocks would be identified with mount partition name and backed up as example dd if=/dev/mtd/mtd2 of=/sdcard/boot.img bs=4096 I'm still uncertain how to see labels as cat /proc/mtd isn't available okay i'm trying terminal as SU cat /dev/block/mmcblk0 > /mnt/media_rw/sdcard1/mmcblk0.img I will them compare the two and if it's pulled exact copy I can do the rest of partitions and go poking around them fails on fat32 limitations https://blog.jplitza.de/2013/07/04/external-sd-card-with-ext4-under-android-cm10-1/ as idea I have full adb shell su Setup rsync on the device (LINK) and on an Ubuntu box, and send it over WiFi to a share with a disk that supports >4GB, (or format a card in EXT4 (unsure if h2 supports that) and save that way. If neither of the aforementioned work, try telling "dd" to split the output stream into a set size per chunk: http://serverfault.com/questions/205621/creating-a-80gb-image-with-dd-on-a-fat32-drive I think you mean (as I did) block size, not page size - (ie, the final argument in the "dd" command you detailed, is "bs" or "block size" in bytes. That is crucial. The best answer is to read man pages, they never fail:"man <command_name>" on a full Linux machine. Edited January 16, 2015 by glossywhite Link to comment Share on other sites More sharing options...
Guest PaulOBrien Posted January 19, 2015 Report Share Posted January 19, 2015 What are you trying to achieve?If you just want to back up your system, do with with busybox tar. Creates a single file, can be compressed, saves / restores permissons.P Link to comment Share on other sites More sharing options...
Guest opensauce Posted January 21, 2015 Report Share Posted January 21, 2015 What are you trying to achieve?If you just want to back up your system, do with with busybox tar. Creates a single file, can be compressed, saves / restores permissons.P Hi paul ideally a flashable img file, on previous yaffs I have managed this and able to edit,alter and reflash Ext4 it moans about file size-previous android system images were 500-800mb. While I have your attention teclast x98 seems to have similar bios setup, my only missgiving is screen size of flash Link to comment Share on other sites More sharing options...
Guest Posted January 25, 2015 Report Share Posted January 25, 2015 (edited) Although maybe a bit too late opensauce here's a list of the partition labels vs blocks: - ls -l /dev/block/platform/intel/by-label/ | sort -t '>' -k 2.21n l/by-label/ | sort -t '>' -k 2.21n < lrwxrwxrwx root root 2014-01-01 00:00 reserved -> /dev/block/mmcblk0p1 lrwxrwxrwx root root 2014-01-01 00:00 ESP -> /dev/block/mmcblk0p2 lrwxrwxrwx root root 2014-01-01 00:00 boot -> /dev/block/mmcblk0p3 lrwxrwxrwx root root 2014-01-01 00:00 recovery -> /dev/block/mmcblk0p4 lrwxrwxrwx root root 2014-01-01 00:00 fastboot -> /dev/block/mmcblk0p5 lrwxrwxrwx root root 2014-01-01 00:00 reserved_1 -> /dev/block/mmcblk0p6 lrwxrwxrwx root root 2014-01-01 00:00 panic -> /dev/block/mmcblk0p7 lrwxrwxrwx root root 2014-01-01 00:00 factory -> /dev/block/mmcblk0p8 lrwxrwxrwx root root 2014-01-01 00:00 misc -> /dev/block/mmcblk0p9 lrwxrwxrwx root root 2014-01-01 00:00 config -> /dev/block/mmcblk0p10 lrwxrwxrwx root root 2014-01-01 00:00 cache -> /dev/block/mmcblk0p11 lrwxrwxrwx root root 2014-01-01 00:00 logs -> /dev/block/mmcblk0p12 lrwxrwxrwx root root 2014-01-01 00:00 system -> /dev/block/mmcblk0p13 lrwxrwxrwx root root 2014-01-01 00:00 rom -> /dev/block/mmcblk0p14 lrwxrwxrwx root root 2014-01-01 00:00 data -> /dev/block/mmcblk0p15 Also, backing up partitions via 'dd' to sdcard is fully functional as you've already inidicated, there's some relevant details here. I'm interested to hear how you've been getting on. :ninja: Edited January 25, 2015 by Guest Link to comment Share on other sites More sharing options...
Guest glossywhite Posted January 25, 2015 Report Share Posted January 25, 2015 Although maybe a bit too late opensauce here's a list of the partition labels vs blocks: - ls -l /dev/block/platform/intel/by-label/ | sort -t '>' -k 2.21n l/by-label/ | sort -t '>' -k 2.21n < lrwxrwxrwx root root 2014-01-01 00:00 reserved -> /dev/block/mmcblk0p1 lrwxrwxrwx root root 2014-01-01 00:00 ESP -> /dev/block/mmcblk0p2 lrwxrwxrwx root root 2014-01-01 00:00 boot -> /dev/block/mmcblk0p3 lrwxrwxrwx root root 2014-01-01 00:00 recovery -> /dev/block/mmcblk0p4 lrwxrwxrwx root root 2014-01-01 00:00 fastboot -> /dev/block/mmcblk0p5 lrwxrwxrwx root root 2014-01-01 00:00 reserved_1 -> /dev/block/mmcblk0p6 lrwxrwxrwx root root 2014-01-01 00:00 panic -> /dev/block/mmcblk0p7 lrwxrwxrwx root root 2014-01-01 00:00 factory -> /dev/block/mmcblk0p8 lrwxrwxrwx root root 2014-01-01 00:00 misc -> /dev/block/mmcblk0p9 lrwxrwxrwx root root 2014-01-01 00:00 config -> /dev/block/mmcblk0p10 lrwxrwxrwx root root 2014-01-01 00:00 cache -> /dev/block/mmcblk0p11 lrwxrwxrwx root root 2014-01-01 00:00 logs -> /dev/block/mmcblk0p12 lrwxrwxrwx root root 2014-01-01 00:00 system -> /dev/block/mmcblk0p13 lrwxrwxrwx root root 2014-01-01 00:00 rom -> /dev/block/mmcblk0p14 lrwxrwxrwx root root 2014-01-01 00:00 data -> /dev/block/mmcblk0p15 Also, backing up partitions via 'dd' to sdcard is fully functional as you've already inidicated, there's some relevant details here. I'm interested to hear how you've been getting on. :ninja: Just to clarify, those labels are symlinked to the actual partitions. You most likely know that, I just wanted to make sure :) Link to comment Share on other sites More sharing options...
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