[KERNEL]GT-S5280 Kernel Source and CPU Frequency Scaling... Why not! - Samsung Galaxy Star

Wait a minute! I'm not writing about Overclock, I simply compiled "Galaxy Star Kernel" from Source...
...for fun...
...with CPU frequency scaling...
Prerequisites:
a 64bit Linux Machine with a working build environment
a local copy of a Jellybean arm cross toolchain
tools to unpack and repack a boot image from a Stock firmware
Kernel source downloaded from Samsung Open Source Release Center
How I did it:
First of all I unzip the kernel source into a linux folder and modify one line from
Code:
CROSS_COMPILE ?= /opt/toolchains/arm-eabi-4.4.3/bin/arm-eabi-
to
Code:
CROSS_COMPILE ?= /home/doc/builds/CYANOGENMOD_10.0__4.1.2_JELLYBEAN/prebuilt/linux-x86/toolchain/arm-eabi-4.4.3/bin/arm-eabi-
which is the full local path to my cross prebuilt toolchain previously downloaded from Cyanogenmod repositories...
Then I follow the kernel readme to prepare it for my Galaxy Star:
Code:
[email protected]:~/tmp/kernel-gt5280$ [b]make mint-vlx-rev03_defconfig[/b]
...
[email protected]:~/tmp/kernel-gt5280$
And finally I simply issue the master command:
Code:
[email protected]:~/tmp/kernel-gt5280$ [b]make zImage[/b]
...
...
...
LD vmlinux
SYSMAP System.map
SYSMAP .tmp_System.map
OBJCOPY arch/arm/boot/Image
Kernel: arch/arm/boot/Image is ready
AS arch/arm/boot/compressed/head.o
GZIP arch/arm/boot/compressed/piggy.gzip
AS arch/arm/boot/compressed/piggy.gzip.o
CC arch/arm/boot/compressed/misc.o
CC arch/arm/boot/compressed/decompress.o
SHIPPED arch/arm/boot/compressed/lib1funcs.S
AS arch/arm/boot/compressed/lib1funcs.o
LD arch/arm/boot/compressed/vmlinux
OBJCOPY arch/arm/boot/zImage
Kernel: arch/arm/boot/zImage is ready
[email protected]:~/tmp/kernel-gt5280$
Unfortunately, repacking the Compressed Kernel (zImage 3,5Mb) with the ramdisk into an Odin boot.img leads to a "not booting" system stuck at samsung logo...
Repacking instead the Uncompressed Kernel (Image 7,1 Mb) leads to normal boot with the system up and running (victory ):
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
Now looking for frequency scaling:
...searching inside Kernel configuration with the command
Code:
[email protected]:~/tmp/kernel-gt5280$ [b]make menuconfig[/b]
I find this menu:
Code:
.config - Linux/arm 3.0.8 Kernel Configuration
──────────────────────────────────────────────────────────────────────────────
┌───────────────────────── CPU Power Management ──────────────────────────┐
│ Arrow keys navigate the menu. <Enter> selects submenus --->. │
│ Highlighted letters are hotkeys. Pressing <Y> includes, <N> excludes, │
│ <M> modularizes features. Press <Esc><Esc> to exit, <?> for Help, </> │
│ for Search. Legend: [*] built-in [ ] excluded <M> module < > │
│ ┌─────────────────────────────────────────────────────────────────────┐ │
│ │ CPU Frequency scaling ---> │ │
│ │ [color=red][ ] CPUfreq support for Spreadtrum SC8810 CPUs[/color] │ │
│ │ [ ] CPU idle PM support │ │
│ │ │ │
│ └─────────────────────────────────────────────────────────────────────┘ │
├─────────────────────────────────────────────────────────────────────────┤
│ <Select> < Exit > < Help > │
└─────────────────────────────────────────────────────────────────────────┘
where I simply switch on the frequency scaling for the Galaxy CPU:
Code:
.config - Linux/arm 3.0.8 Kernel Configuration
──────────────────────────────────────────────────────────────────────────────
┌───────────────────────── CPU Power Management ──────────────────────────┐
│ Arrow keys navigate the menu. <Enter> selects submenus --->. │
│ Highlighted letters are hotkeys. Pressing <Y> includes, <N> excludes, │
│ <M> modularizes features. Press <Esc><Esc> to exit, <?> for Help, </> │
│ for Search. Legend: [*] built-in [ ] excluded <M> module < > │
│ ┌─────────────────────────────────────────────────────────────────────┐ │
│ │ CPU Frequency scaling ---> │ │
│ │ [color=green][[b]*[/b]] CPUfreq support for Spreadtrum SC8810 CPUs[/color] │ │
│ │ [ ] CPU idle PM support │ │
│ │ │ │
│ └─────────────────────────────────────────────────────────────────────┘ │
├─────────────────────────────────────────────────────────────────────────┤
│ <Select> < Exit > < Help > │
└─────────────────────────────────────────────────────────────────────────┘
After another Odin boot.img...
here we are:
Easy Play
Everything shared starting from here: My Google Drive
WARNING: I started from a GT-S5280XXAMF1 Stock Firmware, knowing exactly wat I was doing...
Beware, use my work as you wish but "at your own risk"!
And now what's Next?
...who knows...
...surely I'm not skilled enough to overclock this Kernel source or add governors...
I just made a "one shot compilation" and I was lucky !

---

Can u make another one for gt s5282
Sent from my GT-S5282 using Tapatalk

---

Steps required!
Sure i can!
But, if I can easy handle the Linux side of the job on my PC, I need a step from your phone just before my build action...
...this is true, anyway, only once for a given Kernel Source!
First of All, looking inside Samsung Open Source Release Center I see three Kernel Sources:
I need to choose the right one for the Region of your Phone (or current firmware):
- MEA (Middle East and Africa);
- SEA (South East Asia);
- SWA (South West Asia).
After that, when I prepare the Kernel tree for build (as I briefly described in the first post) with the following command:
Code:
[email protected]:~/tmp/S5282$ [b]make mint-vlx-rev03_defconfig[/b]
...
[email protected]:~/tmp/S5282$
I have to check (once for all) the resulting configuration file with the one extracted from your running kernel!
You must issue one console command from PC with "adb shell" (difficult to setup) or from a Terminal emulator from the Phone (easy to go) installing, for example, the free App "Terminal Emulator" from Palevich (thanks forever ).
The phone, of course, must be rooted and busyboxed;
Here what to type:
Code:
[email protected]:/ $ [b]su[/b]
[email protected]:/ # [b]zcat /proc/config.gz > /data/local/config.txt[/b]
[email protected]:/ #
This command simply creates a text file in the /data/local folder with listed all the configuration options!
I need it to check for differences, just to modify the build tree accordingly.
Ah... of course I need a boot.img file to mod and, maybe, the right PDA code for it... just to prepare an Odin archive with the right naming convention...
After All I'll build the Kernel and prepare two images in my google drive:
- the original boot.img ready for Odin,
- the cpufreq modded boot.img ready for Odin.
What else?
You have to test it!
If it doesn't boot, simply flash back the original image in place.
That's All!
No need to wipe anything before, during and after...

---

Doc_cheilvenerdi.org said:
Sure i can!
But, if I can easy handle the Linux side of the job on my PC, I need a step from your phone just before my build action...
...this is true, anyway, only once for a given Kernel Source!
First of All, looking inside Samsung Open Source Release Center I see three Kernel Sources:
I need to choose the right one for the Region of your Phone (or current firmware):
- MEA (Middle East and Africa);
- SEA (South East Asia);
- SWA (South West Asia).
After that, when I prepare the Kernel tree for build (as I briefly described in the first post) with the following command:
Code:
[email protected]:~/tmp/S5282$ [b]make mint-vlx-rev03_defconfig[/b]
...
[email protected]:~/tmp/S5282$
I have to check (once for all) the resulting configuration file with the one extracted from your running kernel!
You must issue one console command from PC with "adb shell" (difficult to setup) or from a Terminal emulator from the Phone (easy to go) installing, for example, the free App "Terminal Emulator" from Palevich (thanks forever ).
The phone, of course, must be rooted and busyboxed;
Here what to type:
Code:
[email protected]:/ $ [b]su[/b]
[email protected]:/ # [b]zcat /proc/config.gz > /data/local/config.txt[/b]
[email protected]:/ #
This command simply creates a text file in the /data/local folder with listed all the configuration options!
I need it to check for differences, just to modify the build tree accordingly.
Ah... of course I need a boot.img file to mod and, maybe, the right PDA code for it... just to prepare an Odin archive with the right naming convention...
After All I'll build the Kernel and prepare two images in my google drive:
- the original boot.img ready for Odin,
- the cpufreq modded boot.img ready for Odin.
What else?
You have to test it!
If it doesn't boot, simply flash back the original image in place.
That's All!
No need to wipe anything before, during and after...
Click to expand...
Click to collapse
ok no problem.. plz tell if u can make cwm 6.4.4 for galaxy star bcoz we need ot for our CM 11 project
---------- Post added at 01:29 PM ---------- Previous post was at 01:27 PM ----------
rahulsinghal said:
ok no problem.. plz tell if u can make cwm 6.4.4 for galaxy star bcoz we need ot for our CM 11 project
Click to expand...
Click to collapse
bcoz our current focus is on cm and cwm 6.4.4

---

Doc_cheilvenerdi.org said:
Sure i can!
But, if I can easy handle the Linux side of the job on my PC, I need a step from your phone just before my build action...
...this is true, anyway, only once for a given Kernel Source!
First of All, looking inside Samsung Open Source Release Center I see three Kernel Sources:
I need to choose the right one for the Region of your Phone (or current firmware):
- MEA (Middle East and Africa);
- SEA (South East Asia);
- SWA (South West Asia).
After that, when I prepare the Kernel tree for build (as I briefly described in the first post) with the following command:
Code:
[email protected]:~/tmp/S5282$ [b]make mint-vlx-rev03_defconfig[/b]
...
[email protected]:~/tmp/S5282$
I have to check (once for all) the resulting configuration file with the one extracted from your running kernel!
You must issue one console command from PC with "adb shell" (difficult to setup) or from a Terminal emulator from the Phone (easy to go) installing, for example, the free App "Terminal Emulator" from Palevich (thanks forever ).
The phone, of course, must be rooted and busyboxed;
Here what to type:
Code:
[email protected]:/ $ [b]su[/b]
[email protected]:/ # [b]zcat /proc/config.gz > /data/local/config.txt[/b]
[email protected]:/ #
This command simply creates a text file in the /data/local folder with listed all the configuration options!
I need it to check for differences, just to modify the build tree accordingly.
Ah... of course I need a boot.img file to mod and, maybe, the right PDA code for it... just to prepare an Odin archive with the right naming convention...
After All I'll build the Kernel and prepare two images in my google drive:
- the original boot.img ready for Odin,
- the cpufreq modded boot.img ready for Odin.
What else?
You have to test it!
If it doesn't boot, simply flash back the original image in place.
That's All!
No need to wipe anything before, during and after...
Click to expand...
Click to collapse
Bro i will provide that file to you soon bcoz currently I am owning this phone. Plz qait 2-3 dys

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what block partition that can use to flash kernel with cwm ?