Root access on Pandaboard

Brijesh Kamani

I am working on Pandaboard with android ICS.I need to copy some files(e.g.log2) to /system/libs using adb.

My SD card having two partition 1.boot and 2.rootfs

I am working on Linux PC host and followed all the instruction given on "http://www.omappedia.com/wiki/Adb_over_USB" for ADB over USB.

I am using command "./adb push /home/brijesh/Desktop/ICS\ \ Log\ +\ bootargs/log2 /system/libs" to copy this file(log2) but getting error "failed to copy '/home/brijesh/Desktop/ICS Log + bootargs/log2' to '/system/libs': Read-only file system"

I have already edited the rootfs/init.rc file and adjust permissions as given below.

service console /system/bin/sh
   - class core
   - console
   - disabled
   + user root
   + group root

Still i am not able to copy any file to /system directory on SD Card.

How to get root access in Android ICS on pandaboard.

over 13 years ago

0 Gina Glaser over 13 years ago

TI__Expert 8055 points

Brijesh,

I think that the change you made to init.rc will only affect permissions for the serial console, not ADB. Try these commands before the "adb push":

$ ./adb root

$ ./adb remount

Regards,
Gina

0 Brijesh Kamani over 13 years ago in reply to Gina Glaser

Intellectual 600 points

Hi Gina Glaser

I have already tried this commands but not having any change in error.

$ ./adb root

adbd is already running as root

$ ./adb remount

remount failed: Success

Still having same error.

0 Brijesh Kamani over 13 years ago in reply to Brijesh Kamani

Intellectual 600 points

Hi there,

I found that there was an issue regarding file system r/w permission.

So i did change in init.rc as given below

================== init.rc ===================

on post-fs
# once everything is setup, no need to modify /
mount rootfs rootfs / rw remount

==========================================

This will give full access on android ICS file system.

0 Manuel Contreras over 13 years ago in reply to Brijesh Kamani

TI__Genius 10545 points

You can try next commands from your computer,

$ sudo ./adb kill-server
$ sudo ./adb start-server
$ sudo ./adb root
$ sudo ./adb remount
$ sleep 1
$ sudo ./adb kill-server
$ sudo ./adb start-server
$ sudo ./adb root
$ sudo ./adb remount

I am using those in a script to get remounted the device and to use ./adb push, seems what makes the difference is the sudo command at the start of the line.

Somebody told me that it worked ok just by running it one time only this in ICS, but I haven't check it. And probably removing the sleep should not affect.

0 Brijesh Kamani over 13 years ago in reply to Manuel Contreras

Intellectual 600 points

Hi Manuel,

Actually ./adb push is working on /data directory of my rootfs but it was giving "Read-only file system" error when i was trying to copy any file to /system folder.

This issue is fixed by doing change in init.rc as "mount rootfs rootfs / ro remount" with "mount rootfs rootfs / rw remount"

Now even i don't have to use ./adb root and ./adb remount commands.

I can directly push my any file to any location in file system.

=============================================

$ sudo ./adb kill-server

$ sudo ./adb start-server

$ sudo ./adb push /home/abc.log /system/

=============================================

0 Manuel Contreras over 13 years ago in reply to Brijesh Kamani

TI__Genius 10545 points

Brijesh;

It is great to know that issue is addressed by modifying the init.rc to include remount commands and it worked for you.

In my case when I tried to modify init.rc to modify system/mount from a mounted system it is not possible since it is in root directory,

then I need to follow the procedure in

http://omapedia.org/wiki/Android_eMMC_Booting

to modify the respective image, I am using emmc like described in 4AI releases then it is easier to use root and remount commands.

http://omapedia.org/wiki/4AI.1.7_OMAP4_Icecream_Sandwich_Release_Notes#Preparing_eMMC_images

Of course modifying the image before creating it is an option to me, thanks.

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Root access on Pandaboard