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Mediacom 810c / Prestigio PMP5080B kernel on CM10.1 v1.2.4 cannot boot
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netlars

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2014/01/06 - 09:05
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fine.

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DaremoS
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2014/02/04 - 04:46
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  • Mediacom M810C, Prestigio PMP5080B, Nextbook Next 8p, BQ Kepler, yifang M803C (OEM) >>> you may use the latest kernel of xteam/yatto

- I'm using perfectly well CrewRKTablets_RK29_Loox_CM10.1_4.2.2_v1.2.4 with original kernel_308_820_dmtech, which is the original of Yifang M900HC, the problem is that is annoying slow (a poor 2948 in Antutu 4). 

- In the same tablet I have had XTEAM 4.13 by Yatto, android 4.1.1, system ext3, with the awesome kernel they installed in version 4.12, with support for zRAM, that you suggested to use in the paragraph above. This work great in the same M900HC with an impressive speed. (Overlocked and zRAM)

When I use such kernel by Yatto with your rom, happens the issue stated in OP. IMHO there is something related with ext4 (ROM) and ext3 (kernel). (No idea if this is right)

I want to have both worlds, or at least, a kernel capable of overlock and zRAM.

PD. I've been using fine, in CM10.1, the new "Google Home Launcher" or GEL (Google Experience Launcher), which is awesome for me... ¡it just need a better speed!.

Tablet Master-G G-820c (Yifang M900HC) 8" - RK2918
Tablet Onn 07HD (Yifang M7000NBD) 7"- AML8726-MXS
Tablet Onn 07DX (Yifang M7000KD) 7" - RK3066
Tablet Onn 07D (Yifang M7100KLD) 7"- RK3026
Phablet Samsung Galaxy Note 3
Cellphone Samsung Galaxy Trend

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JochenKauz

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2014/02/05 - 01:34
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I'm not sure if I understand you in the right manner, but the kernel is not formatted with ext3.

Did you make a complete flash, inkluding eraseidb and format_nand?

It's not clear for me how you installed the XTeam Kernel.

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2014/02/05 - 02:26
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JochenKauz said
I'm not sure if I understand you in the right manner, but the kernel is not formatted with ext3.

Did you make a complete flash, inkluding eraseidb and format_nand?

It's not clear for me how you installed the XTeam Kernel.

I don't know about kernels... I'm just a cook:
I was thinking that in kernel it's stated the type of file format (ext3, ext4)

I install the kernel using both ways: using loader and kernel, and doing a complete flash (erase IDB and OMA's modules). In both fails hanging in a loop.

I've tested many kernels using first method. Best suitable have been Mediacom-M820c3G which is compatible with my tablet, with issues in WiFi and battery status.

In fact I just need a kernel for Mediacom-M820c NO-3G, the one I use is original Mediacom-820c (Yifang M900HC).

As I've said I've had long time Xteam rom in my tablet. But as android 4.1.1, it has some limitations (beside of ext3).

Tablet Master-G G-820c (Yifang M900HC) 8" - RK2918
Tablet Onn 07HD (Yifang M7000NBD) 7"- AML8726-MXS
Tablet Onn 07DX (Yifang M7000KD) 7" - RK3066
Tablet Onn 07D (Yifang M7100KLD) 7"- RK3026
Phablet Samsung Galaxy Note 3
Cellphone Samsung Galaxy Trend


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JochenKauz

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2014/02/05 - 02:54
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Normally the kernels should be ready for ext3/ext4.

Do you know if yatto has published the sources for the zRam enabled kernel? I have looked at his github and did not found anything..

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DaremoS
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2014/02/05 - 17:04
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JochenKauz said
Normally the kernels should be ready for ext3/ext4.

Do you know if yatto has published the sources for the zRam enabled kernel? I have looked at his github and did not found anything..

Did you try this:

https://github.com/yatto/xteam31/tree/master/kernel

 Uff! is from 2 years ago

 

Tablet Master-G G-820c (Yifang M900HC) 8" - RK2918
Tablet Onn 07HD (Yifang M7000NBD) 7"- AML8726-MXS
Tablet Onn 07DX (Yifang M7000KD) 7" - RK3066
Tablet Onn 07D (Yifang M7100KLD) 7"- RK3026
Phablet Samsung Galaxy Note 3
Cellphone Samsung Galaxy Trend

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JochenKauz

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2014/02/05 - 17:16
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Yepp, thats the problem.

Yatto published here the zRam patch, but I have not seen his kernel sources updated.

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yattodettaman

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2014/02/11 - 10:04
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I've published the last Kernel Source !

If you like there is a mod to Zram: the snappy compression mode.

JochenKauz said
Yepp, thats the problem.

Yatto published here the zRam patch, but I have not seen his kernel sources updated.

 

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2014/02/12 - 16:24
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Hi yatto,

okay, so the sources are the latest ones, but without the config changes.

But what do you mean with "snappy compression mode"?

 

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2014/02/13 - 01:52
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yattodettaman said
I've published the last Kernel Source !

If you like there is a mod to Zram: the snappy compression mode.

Tante gracie caro Yatto!!! 

I just hope that with this help to have a kernel for Yifang M900HC (Mediacom 820c, Dmtech 820)

Of course, JochenHauz have to do the trick.

But what do you mean with "snappy compression mode"?

 IMHO he is just giving a name to zRAM

Tablet Master-G G-820c (Yifang M900HC) 8" - RK2918
Tablet Onn 07HD (Yifang M7000NBD) 7"- AML8726-MXS
Tablet Onn 07DX (Yifang M7000KD) 7" - RK3066
Tablet Onn 07D (Yifang M7100KLD) 7"- RK3026
Phablet Samsung Galaxy Note 3
Cellphone Samsung Galaxy Trend

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yattodettaman

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2014/02/13 - 08:30
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Google's Snappy data compression library is a faster alternative to LZO,

Zram currently uses LZO compression. With Snappy, it uses less CPU time and is thus more useful. On compressible input it compresses ~2.5x faster than LZO
and decompresses ~1.5-2x faster than LZO. On incompressible input, it skips the input at 100x faster than LZO and decompresses ~4x faster than LZOThe sacrifice in compression ratio is small.
Zram's LZO and Snappy support can be independently enabled at compile time and each zram device can switch between compression methods when unused.
When only a single compression method was enabled at compile time, no idirection penalty is incurred.

I've applied this patch :

http://www.spinics.net/lists/linux-driver-devel/msg13998.html
http://www.spinics.net/lists/linux-driver-devel/msg13999.html

To optimize Zram i enabled in the kernel :

CONFIG_CGROUP_MEM_RES_CTLR= y

CONFIG_CGROUP_MEM_RES_CTLR_SWAP=y

By default, the Linux kernel swaps in 8 pages of memory at a time. When using ZRAM, the incremental cost of reading 1 page at a time is negligible and may help in case the device is under extreme memory pressure.

To read only 1 page at a time, i added the following to init.rc:

write /proc/sys/vm/page-cluster 0

I also added the KSM support to the kernel :

CONFIG_KSM=y

and then i added add the following lines to

init.rc file:

write /sys/kernel/mm/ksm/pages_to_scan 100

write /sys/kernel/mm/ksm/sleep_millisecs 500

write /sys/kernel/mm/ksm/run 1

 

Whit these Mods the kernel run much better and the battery performance too.

Joken, You're right, there is no commit to the kernel source, but i've no time, sorry.

regards, Yatto

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yattodettaman

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2014/03/20 - 15:33
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howto rock with CM10.1 by crewrktablets if yu have a Mediacom 810c or PMP5080B or BQKEPLER.

1) Download  theRom cm10.1 1.2.4 from: http://crewrktablets.arctablet.com/?wpfb_dl=1300

Flash it but you have to use this files, instead of original ones :

a) this Paramters file: Zippyshare.com - parameter422
b) this Boot.img : Zippyshare.com - boot.img
3) this kernel.img  : Zippyshare.com - CM10_kernel.img

After flashing the rom, reboot in recovery and run this scripts:

Format Nand zip : http://crewrktablets.arctablet.com/?wpfb_dl=635
Service jar Fix (iVery importatnt to avoid Bootloops): Zippyshare.com - CrewRKTablets_CM10.1_124_service_fix.zip
USB Bluetooth Support Patch: http://crewrktablets.arctablet.com/?wpfb_dl=1311
Zram Support patch: http://crewrktablets.arctablet.com/?wpfb_dl=1388

Xteam has made a new kernel for cm10.1 by crewrktablets with :

USB CSR Bluetooth Support
Zram Support (you have to enable it in developer settings)
KSM Support (you have to enable it in developer settings)
Fix camera and e Rotation

regards,
Xteam

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2014/03/20 - 17:35
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Excellent yatto!

We should make this available for many users. Is it ok when I publish this on our blog?

Maybe you have some screenshots for presentation.

 

- Oma -

 

 

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yattodettaman

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2014/03/20 - 18:01
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Yes, Of course, You can publish it ! :D

 

I have no screenshot, because that is your rom. I didn't make any mod to the system. I only make a Kernel for your cm10.1 and a fix for service.jar to avoid botloop with my kernel that have the battery fix inside !

That's all.

I added Ksm in the kernel and in the boot.img like i wrote some post ago.... and battery life is much better !

Enable KSM in your kernels....

 

Bye....

 

P.S. KitKat ? Any News for rk29 ?!? :)

 

regard,

yatto

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2014/03/20 - 18:59
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Here we go: http://crewrktablets.arctablet.com/?p=3143

 

Let's rock CM11 together ... netlars will get in touch with you.

 

- Oma -

 

 

 

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