Motorola Droid X2 (motorola-daytona)
This device has a locked bootloader, installing custom roms requires an exploit. Unknown if this device will ever be booting. This phone is a really old former daily driver, so I thought about pulling it out and messing around to see if there's anything I can do, collect any information about the device, and see if it's possible to get it booting. There's some interesting stuff related to the bootloader that you can access by holding down+ , you can cycle through them with and select with , including console=ttyS0,115200n8, which I assume is for serial, interesting that they left that in the production units considering the bootloader is locked down, and NvFlash which may or may not be exploitable.
When this device is plugged into a computer, the internal storage partition behaves like a mass storage device, such as a flash drive.
Disk /dev/sdc: 4.36 GiB, 4683988992 bytes, 9148416 sectors Disk model: MB870 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: 0x00000000
Rooting and booting custom kernels
There's userland and kernel exploits for rooting Android, kexec may be possible! Investigating kexec here. My idea is to kexec into a mainline kernel, and from there launch postmarketOS. This idea is also talked about here.
Booting into Clock Work Mod Recovery
Back in the day there was a method of installing custom roms by rooting the phone from userspace and bootstrapping a custom recovery. This seems to hijack the "Charge Only" mode which it enters when you plug in a charging cable without pressing any buttons (it shows an animation of a battery filling up). It's a ramdisk hijack so it's not booting into a custom kernel, however we might be able to use this method to kexec. This method is also used for installing custom roms, fun stuff we can do there.
Research into booting custom kernels
I'm researching into the possibility of using kexec as an option for loading custom kernels. Tegra also has exploits, so unlocking the bootloader doesn't seem impossible, however entering APX mode might require a special cable, and using APX mode to unlock the bootloader may or may not be quite difficult. We might be able to load a patched bootloader.
Linux version 22.214.171.124-00005-g2440aba (hudsoncm@il93lnxdroid52) (gcc version 4.4.0 (GCC) ) #2 SMP PREEMPT Tue Aug 23 22:13:22 CDT 2011
Partition layout (Android 2.3.4)
Partitions don't seem to be named, so I don't know what any of them are for.
# fdisk -l /dev/block/mmcblk0 Disk /dev/block/mmcblk0: 7991 MB, 7991721984 bytes 1 heads, 16 sectors/track, 975552 cylinders Units = cylinders of 16 * 512 = 8192 bytes Disk identifier: 0x00000000 Device Boot Start End Blocks Id System /dev/block/mmcblk0p1 65 512 3584 83 Linux Partition 1 does not end on cylinder boundary. /dev/block/mmcblk0p2 513 576 512 83 Linux Partition 2 does not end on cylinder boundary. /dev/block/mmcblk0p3 577 832 2048 83 Linux Partition 3 does not end on cylinder boundary. /dev/block/mmcblk0p4 833 1046848 8368128 5 Extended Partition 4 does not end on cylinder boundary. /dev/block/mmcblk0p5 897 1024 1024 83 Linux /dev/block/mmcblk0p6 1025 1088 512 83 Linux /dev/block/mmcblk0p7 1089 1152 512 83 Linux /dev/block/mmcblk0p8 1153 1280 1024 83 Linux /dev/block/mmcblk0p9 1281 1536 2048 83 Linux /dev/block/mmcblk0p10 1537 2560 8192 83 Linux /dev/block/mmcblk0p11 2561 3584 8192 83 Linux /dev/block/mmcblk0p12 3585 61184 460800 83 Linux /dev/block/mmcblk0p13 61185 61248 512 83 Linux /dev/block/mmcblk0p14 61249 63808 20480 83 Linux /dev/block/mmcblk0p15 63809 103232 315392 83 Linux /dev/block/mmcblk0p16 103233 365376 2097152 83 Linux /dev/block/mmcblk0p17 365377 403776 307200 83 Linux /dev/block/mmcblk0p18 403777 1046848 5144576 83 Linux
Mount Output (Android 2.3.4)
rootfs / rootfs ro,relatime 0 0 tmpfs /dev tmpfs rw,relatime,mode=755 0 0 devpts /dev/pts devpts rw,relatime,mode=600 0 0 proc /proc proc rw,relatime 0 0 sysfs /sys sysfs rw,relatime 0 0 tmpfs /mnt/asec tmpfs rw,relatime,mode=755,gid=1000 0 0 tmpfs /mnt/obb tmpfs rw,relatime,mode=755,gid=1000 0 0 /dev/block/mmcblk0p12 /system ext3 ro,noatime,nodiratime,barrier=1,data=ordered 0 0 /dev/block/mmcblk0p16 /data ext3 rw,nosuid,nodev,noatime,nodiratime,errors=continue,barrier=1,data=ordered 0 0 /dev/block/mmcblk0p15 /cache ext3 rw,nosuid,nodev,noatime,nodiratime,errors=continue,barrier=1,data=ordered 0 0 /dev/block/mmcblk0p17 /preinstall ext3 ro,nosuid,nodev,noatime,nodiratime,data=ordered 0 0 /dev/block/vold/179:18 /mnt/sdcard vfat rw,dirsync,nosuid,nodev,noexec,relatime,uid=1000,gid=1015,fmask=0702,dmask=0702,allow_utime=0020,codepage=cp437,iocharset=iso8859-1,shortname=mixed,utf8,errors=remount-ro 0 0 /dev/block/vold/179:18 /mnt/secure/asec vfat rw,dirsync,nosuid,nodev,noexec,relatime,uid=1000,gid=1015,fmask=0702,dmask=0702,allow_utime=0020,codepage=cp437,iocharset=iso8859-1,shortname=mixed,utf8,errors=remount-ro 0 0 tmpfs /mnt/sdcard/.android_secure tmpfs ro,relatime,size=0k,mode=000 0 0
Users owning this device
- NoriTech (Notes: researching booting postmarketOS on this phone)