Measy A5a unable to remount /system to read/write mode

[zsoltino]

Hi,

I am a linux user since 1999-2000.

I have an RK2918 TV Box (Measy A5A, specification is here: http://www.measy.com.cn/product/showproduct42_en.htm )

I found a rom, which is rooted, and working fine, but not well with the external usb keyboard, because the ENTER key is not to do his work... I use google, and found the solving, what is simple, and it is just a minute:

I must change the

"key 28 DPAD_CENTER WAKE_DROPPED"

line to

"key 28 ENTER"

in the /system/usr/keylayout/Generic.kl file, and thats it!

But when I try to remount /system to rw mode, that is unavailable, and I don't know, what is the problem. I google, and google, since 3-4 hour, but I can't find the solving.

After su, the mount said, the /system is the /dev/block/nandd, it is ext4, and mounted ro. The /, and ALL of the other filesystem mounted rw. So, I try to remount the /system:

mount -o remount,rw /system

It is not working, it said the usage. So,

mount -o remount,rw -t ext4 /dev/block/nandd /system

the answer is:
mount: Read-only filesystem

mount said again: it is mounted ro. I do not understand how it is possible...

Anybody have an idea, how it is possible? If anybody nead that rom for the answer, can download here:

http://www.sendspace.com/file/rcc8jm

Thanks

[zsoltino]

Nobody have an idea, how possible edit the system file on android?

[Finless]

It's because your ROM uses system as a CRAMFS file system. CRAMFS was used on my RK2918 devices. While you can root it, you cannot write to system because CRAMFS is a read only file system.

This can be changed by making a new ROM with EXT3 file system.

If you have the original stock ROM image this can be done.

Also I am mving this ot the TV player Measy forum. Having it here is probably why you got no response.

Bob

[zsoltino]

It's because your ROM uses system as a CRAMFS file system. CRAMFS was used on my RK2918 devices. While you can root it, you cannot write to system because CRAMFS is a read only file system.
Bob

If I type:

mount

in the terminal, it is said:

/system ext4 ro, etc....
/cache ext4 rw, etc...
/anything ext4 rw, ...
...

It is possible, that is cramfs, not ext4?

[Finless]

OK so it looks like you do have a EXT4 file system. Rare for a stock ROM on RK29. Or you have a custom ROM.

Init.rc always mounts system as RO for safety. You should be able to remount it RW.

1) Get ES File explorer from Google Play. Go into settings for ES and set for root explorer and remount system RW. It should work.

2) In a terminal type this:
su
mount -o rw,remount /system

That should also mount it RW.

If not, then something is messed up with the ROM like the busybox or something.

Bob

[zsoltino]

I have a custom ROM, it's link is in my first post. I downloaded from there, and flashed it. You or anybody can download it.

Remount with ES File explorer or the terminal

su
mount -o rw,remount /system

not working. ES said: failed, terminal said nothing (it is mean OK), BUT!!! it is a lie, the /system mounted ro, not rw. It is not working. Interesting...

Is it possible, that rom's /system be mounted rw? Or can you modified that rom: /system mounted rw default?

(Or anybody have a working, rooted Measy A5A ROM, with remountable /system?)

Thanks a lot.


Zsolt

[Finless]

I did a Measy A5A ICS ROM a while ago. It is rooted and works!

http://video.freaktab.com/?subpath=finless&filename=a5aplayer_finless_test1_3.zip

I never updated it since then to JB etc.

You can try it and see if you can mount RW as I explained above.

I can make a new updated ROM thast will work properly but I want to work from the stock latest ROM for the A5A. If you provide a link, I will make a ROM for you next week.

Bob

[zsoltino]

OK, the problem is that rk29update.exe is not detect the device. I follow the readme, but it said, the problem is the device is not recoveri mode. But that is, - i think - because livesuit v1.07 is found that, and it can updating that.

I dont now, why rk29update in your pack can't detect the device. Any idea, or if you can build an update.img, I can use it with livesuit...

many thanks

[Finless]

Livesuit is not for Rockchip ROMS it is for All Winner! You use the flash tool that is in my ROM kit. But to get that to work you have to know how to get it into flash mode.

Read this thread when I made the first ROM for this A5A I think the guy there explains how to do it.

http://www.freaktab.com/showthread.p...Android-Player

However, reading here a little it sound like there maybe 2 models?
The ROM I made was for a A5A based on RK29 Rockchip ROM.

Yet I see in this post someone saying livesuit works and the A5A is a All Winner A10?

http://www.freaktab.com/showthread.p...ybody-can-help


So I am not sure what to say? This is a little confusing now.


Bob

[zsoltino]

OK. In the manufacturer's page (http://www.measy.com.cn/product/showproduct42_en.htm) said:

Allwinner A10, 1,2Ghz.

But, an android app said, it is only 1,08Ghz.

1. Is it possible, an rk29?
2. How can I investigate, what processor is in my a5a box?
3. When I plugged in the box to PC, PC said the usb device is vid_1f3a_pid_efe8, and i think it is na rk2918, isnt it?

[Finless]

There is a device analyzer APP in google play that will dump all that info for you and tell you exactly what it is. I forget the name but it should not be too hard to find it.

Bob

[zsoltino]

I found an app "Device info". It is said:

ARMv7 processor rev 2 (v7l)
Bogomips: 1001.88
CPU implementer: 0x41
CPU arch: 7
CPU variant: 0x308
CPU part: 0xc08
CPU revision 2

Model: SoftwinerEvb
Board: crane
Device: apollo
Brand: Softwinners
Android: 4.0.4


Do you need another info?

[Finless]

Yep... board=crane is a All Winner processor. I have no ROM for that.

Bob

[zsoltino]

Here is a working rom:

http://www.sendspace.com/file/rcc8jm

I use this, it os OK, but only the /system do not remountable to rw mode.

Can you watch in, and do something, that the /system will be rw?

Or:

1. Can you unpack it
2. change the line from:
"key 28 DPAD_CENTER WAKE_DROPPED"
to
"key 28 ENTER"
in the /system/usr/keylayout/Generic.kl file
3. repack it

:-)

Or:

How can I do this step by step?

Thanks

[Finless]

I am not an All winner guy. I can do some stuff but Elektrik is our All Winner ROM guy here. He hangs out in the polaroid forum. So you might PM him and have him look at this thread. I am sure he can do something with this.

Bob