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Problems with dumping the boot and recovery.

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globula_neagra

Senior Member
Jun 28, 2009
261
79
Birmingham
Hello, i have a new tablet from Arnova (little brother of Archos)
Spec of the tablet
1.4 ghz msm 8255 processor
512 ram
ICS operating system

What is the case, i managed to root the tablet, and dump the system partition, but romdump is not able to dump the boot and recovery, so i asked myself why

These are some results

mount
rootfs / rootfs ro,relatime 0 0
tmpfs /dev tmpfs rw,nosuid,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
none /acct cgroup rw,relatime,cpuacct 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
none /dev/cpuctl cgroup rw,relatime,cpu 0 0
/dev/block/mmcblk0p12 /system ext4 ro,relatime,user_xattr,barrier=1,data=ordered
0 0
/dev/block/mmcblk0p13 /data ext4 rw,nosuid,nodev,relatime,user_xattr,barrier=1,d
ata=ordered,noauto_da_alloc 0 0
/dev/block/mmcblk0p14 /persist ext4 rw,nosuid,nodev,relatime,user_xattr,barrier=
1,data=ordered 0 0
/dev/block/mmcblk0p15 /cache ext4 rw,nosuid,nodev,relatime,user_xattr,barrier=1,
data=ordered 0 0
/dev/block/mmcblk0p17 /content ext4 rw,nosuid,nodev,relatime,user_xattr,barrier=
1,data=ordered 0 0
/dev/block/vold/179:20 /mnt/sdcard vfat rw,dirsync,nosuid,nodev,noexec,relatime,
uid=1000,gid=1015,fmask=0702,dmask=0702,allow_utime=0020,codepage=cp437,iocharse
t=iso8859-1,shortname=mixed,utf8,errors=remount-ro 0 0
/dev/block/vold/179:20 /mnt/secure/asec vfat rw,dirsync,nosuid,nodev,noexec,rela
time,uid=1000,gid=1015,fmask=0702,dmask=0702,allow_utime=0020,codepage=cp437,ioc
harset=iso8859-1,shortname=mixed,utf8,errors=remount-ro 0 0
tmpfs /mnt/sdcard/.android_secure tmpfs ro,relatime,size=0k,mode=000 0 0
/dev/block/vold/179:97 /mnt/external_sd vfat rw,dirsync,nosuid,nodev,noexec,rela
time,uid=1000,gid=1015,fmask=0702,dmask=0702,allow_utime=0020,codepage=cp437,ioc
harset=iso8859-1,shortname=mixed,utf8,errors=remount-ro 0 0

[email protected]:/ # df
df
Filesystem Size Used Free Blksize
/dev 194M 48K 194M 4096
/mnt/asec 194M 0K 194M 4096
/mnt/obb 194M 0K 194M 4096
/system 295M 223M 71M 4096
/data 393M 73M 320M 4096
/persist 4M 1M 3M 1024
/cache 196M 4M 192M 4096
/content 17M 13M 3M 4096
/mnt/sdcard 2G 1M 2G 4096
/mnt/secure/asec 2G 1M 2G 4096
/mnt/external_sd 3G 2G 1G 32768

[email protected]android:/ # ls /dev/block/mmcblk*
ls /dev/block/mmcblk*
/dev/block/mmcblk0
/dev/block/mmcblk0boot0
/dev/block/mmcblk0boot1
/dev/block/mmcblk0p1
/dev/block/mmcblk0p10
/dev/block/mmcblk0p11
/dev/block/mmcblk0p12
/dev/block/mmcblk0p13
/dev/block/mmcblk0p14
/dev/block/mmcblk0p15
/dev/block/mmcblk0p16
/dev/block/mmcblk0p17
/dev/block/mmcblk0p18
/dev/block/mmcblk0p19
/dev/block/mmcblk0p2
/dev/block/mmcblk0p20
/dev/block/mmcblk0p3
/dev/block/mmcblk0p4
/dev/block/mmcblk0p5
/dev/block/mmcblk0p6
/dev/block/mmcblk0p7
/dev/block/mmcblk0p8
/dev/block/mmcblk0p9
/dev/block/mmcblk1
/dev/block/mmcblk1p1
[email protected]:/ # cat proc/mtd
cat proc/mtd
dev: size erasesize name

I am asking for some help.
How can i dump the boot and recovery ?
It is posibile considering the fact that there is no mtd ?
I am not an expert in this, so if i got something wrong show me what i dit.
Thx for any help.
 
Last edited:

globula_neagra

Senior Member
Jun 28, 2009
261
79
Birmingham
There is no MTD on the 7c g3 only on the 7c g2 is a mtd, on the 7c g3 it is emcc which is used also on the htc phones and samsung phones.

This is the 7C G2
mount
rootfs on / type rootfs (rw)
tmpfs on /dev type tmpfs (rw,relatime,mode=755)
devpts on /dev/pts type devpts (rw,relatime,mode=600)
proc on /proc type proc (rw,relatime)
sysfs on /sys type sysfs (rw,relatime)
none on /acct type cgroup (rw,relatime,cpuacct)
tmpfs on /mnt/asec type tmpfs (rw,relatime,mode=755,gid=1000)
tmpfs on /mnt/obb type tmpfs (rw,relatime,mode=755,gid=1000)
none on /dev/cpuctl type cgroup (rw,relatime,cpu)
/dev/block/mtdblock1 on /system type yaffs2 (rw,relatime)
/dev/block/mtdblock4 on /data type yaffs2 (rw,nosuid,nodev,relatime)
/dev/block/mtdblock5 on /persist type yaffs2 (rw,nosuid,nodev,relatime)
/dev/block/mtdblock7 on /content type yaffs2 (rw,nosuid,nodev,relatime

And this one is the 7C G3


mount
rootfs / rootfs ro,relatime 0 0
tmpfs /dev tmpfs rw,nosuid,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
none /acct cgroup rw,relatime,cpuacct 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
none /dev/cpuctl cgroup rw,relatime,cpu 0 0
/dev/block/mmcblk0p12 /system ext4 ro,relatime,user_xattr,barrier=1,data=ordered
0 0
/dev/block/mmcblk0p13 /data ext4 rw,nosuid,nodev,relatime,user_xattr,barrier=1,d
ata=ordered,noauto_da_alloc 0 0
/dev/block/mmcblk0p14 /persist ext4 rw,nosuid,nodev,relatime,user_xattr,barrier=
1,data=ordered 0 0
/dev/block/mmcblk0p15 /cache ext4 rw,nosuid,nodev,relatime,user_xattr,barrier=1,
data=ordered 0 0
/dev/block/mmcblk0p17 /content ext4 rw,nosuid,nodev,relatime,user_xattr,barrier=
1,data=ordered 0 0
/dev/block/vold/179:20 /mnt/sdcard vfat rw,dirsync,nosuid,nodev,noexec,relatime,
uid=1000,gid=1015,fmask=0702,dmask=0702,allow_utim e=0020,codepage=cp437,iocharse
t=iso8859-1,shortname=mixed,utf8,errors=remount-ro 0 0
/dev/block/vold/179:20 /mnt/secure/asec vfat rw,dirsync,nosuid,nodev,noexec,rela
time,uid=1000,gid=1015,fmask=0702,dmask=0702,allow _utime=0020,codepage=cp437,ioc
harset=iso8859-1,shortname=mixed,utf8,errors=remount-ro 0 0
tmpfs /mnt/sdcard/.android_secure tmpfs ro,relatime,size=0k,mode=000 0 0
/dev/block/vold/179:97 /mnt/external_sd vfat rw,dirsync,nosuid,nodev,noexec,rela
time,uid=1000,gid=1015,fmask=0702,dmask=0702,allow _utime=0020,codepage=cp437,ioc
harset=iso8859-1,shortname=mixed,utf8,errors=remount-ro 0 0

I forgot to say that the 7C G3 has also a 4gb Internal space which is showd in the first post (how is partitioned)
This is the boot image that i have just dumped using the command :

[email protected]:/ # dd if=/dev/block/mmcblk0p8 of=/sdcard/bootmmc8.img bs=4096
dd if=/dev/block/mmcblk0p8 of=/sdcard/bootmmc8.img bs=4096
2560+0 records in
2560+0 records out
10485760 bytes transferred in 0.461 secs (22745683 bytes/sec)
this was the block where i found this image
http://depositfiles.com/files/qd34j4fkl

Now i am not sure if i can flash this image without breaking the tablet, and i can not find the recovery.
 

globula_neagra

Senior Member
Jun 28, 2009
261
79
Birmingham
i just tried the boot.img and it works :D
now i just need to find the recovery partition, it must be one from this 22 mmc blocks


i will upload the system.tar dump, maybe you can make a system.img (i don`t know how) for backup to stock rom
 

wolfpack612

Senior Member
Nov 18, 2006
438
74
Hollywood
had problems finding my boot and recovery blocks on my device and ran into this thread and someone mentioned that there's no mtd but emmc so i tried cat proc/emmc and boom! that got me what i needed :)