[INFO] Building the Linux kernel for Xperia phones

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Hi all devs,
Please use this thread for questions related to the information in the article:
How to build a Linux kernel and flash it to the phone on Sony Ericsson Developer Blog.

We will try to monitor this thread, but we cannot guarantee an answer for every question asked.

Regards
/Karl-Johan Dahlström
Sony Ericsson Developer Program


For me more developer information please check out Developer World.

nice to se Sony getting involved with the costumers.. keep it that way

Just need to tell us how to unlock the Sim-locked boot loaders now, and the whole world would be a sweeter place

Great to see you going all out with the new improved Android stategy. Just a nitpick though:

The "Why rebuild the kernel?" section doesn't really make sense. I'd say theming and removing apps is as far from kernel-related as you can get while staying within the confines of Android. :P I'm sure you know that as a developer and that it's just that the text has passed through the PR department a few times. Perhaps you can say something like "It allows you to add new features and get the latest security fixes".

Thank you for this :)

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Very nice to see you on XDA :)

Phear not my friendly X10 phonez will see the light of day in this thread too!

Neo / Pro / Play

mkbootimg --base 0x00200000 --kernel kernel/arch/arm/boot/zImage --ramdisk ramdisk.img -o boot.img

X10
Refer back to this post to get thing's into context, there are custom kernels and the files provided by Bin4ry, Goroh and Jerpelea are available - *advanced development skills required* - It will be simplified and much work continues to make this happen for the community as AOSP.

http://forum.xda-developers.com/showthread.php?t=726813

Can someone please post a boot.img from the Arc, the Neo, and the Play?

Hello there, im trying to build the kernel contained in the "3.0.A.2.181_182.tar.bz2" file.

I used the -i option because it halts at a warning:

cc1: warnings being treated as errors
init/main.c: In function 'do_one_initcall':
init/main.c:711:10: error: 'calltime.tv64' may be used uninitialized in this function
make[1]: *** [init/main.o] Error 1
make: *** [init] Error 2

When used with -i it still doesn't build the zImage, because it cannot find a lot of files ?

/home/sim/CodeSourcery/SGL/bin/arm-none-eabi-ld: cannot find init/main.o: No such file or directory
make[1]: [init/built-in.o] Error 1 (ignored)
  LD      .tmp_vmlinux1
/home/sim/CodeSourcery/SGL/bin/arm-none-eabi-ld: cannot find init/built-in.o: No such file or directory
/home/sim/CodeSourcery/SGL/bin/arm-none-eabi-ld: cannot find arch/arm/mm/built-in.o: No such file or directory
/home/sim/CodeSourcery/SGL/bin/arm-none-eabi-ld: cannot find kernel/built-in.o: No such file or directory
/home/sim/CodeSourcery/SGL/bin/arm-none-eabi-ld: cannot find drivers/built-in.o: No such file or directory
/home/sim/CodeSourcery/SGL/bin/arm-none-eabi-ld: cannot find net/built-in.o: No such file or directory
make: [.tmp_vmlinux1] Error 1 (ignored)
  KSYM    .tmp_kallsyms1.S
/home/sim/CodeSourcery/SGL/bin/arm-none-eabi-nm: '.tmp_vmlinux1': No such file
No valid symbol.
make: [.tmp_kallsyms1.S] Error 1 (ignored)
  AS      .tmp_kallsyms1.o
  LD      .tmp_vmlinux2
/home/sim/CodeSourcery/SGL/bin/arm-none-eabi-ld: cannot find init/built-in.o: No such file or directory
/home/sim/CodeSourcery/SGL/bin/arm-none-eabi-ld: cannot find arch/arm/mm/built-in.o: No such file or directory
/home/sim/CodeSourcery/SGL/bin/arm-none-eabi-ld: cannot find kernel/built-in.o: No such file or directory
/home/sim/CodeSourcery/SGL/bin/arm-none-eabi-ld: cannot find drivers/built-in.o: No such file or directory
/home/sim/CodeSourcery/SGL/bin/arm-none-eabi-ld: cannot find net/built-in.o: No such file or directory
make: [.tmp_vmlinux2] Error 1 (ignored)
  KSYM    .tmp_kallsyms2.S
/home/sim/CodeSourcery/SGL/bin/arm-none-eabi-nm: '.tmp_vmlinux2': No such file
No valid symbol.
make: [.tmp_kallsyms2.S] Error 1 (ignored)
  AS      .tmp_kallsyms2.o
  LD      vmlinux
/home/sim/CodeSourcery/SGL/bin/arm-none-eabi-ld: cannot find init/built-in.o: No such file or directory
/home/sim/CodeSourcery/SGL/bin/arm-none-eabi-ld: cannot find arch/arm/mm/built-in.o: No such file or directory
/home/sim/CodeSourcery/SGL/bin/arm-none-eabi-ld: cannot find kernel/built-in.o: No such file or directory
/home/sim/CodeSourcery/SGL/bin/arm-none-eabi-ld: cannot find drivers/built-in.o: No such file or directory
/home/sim/CodeSourcery/SGL/bin/arm-none-eabi-ld: cannot find net/built-in.o: No such file or directory
make: [vmlinux] Error 1 (ignored)
  SYSMAP  System.map
/home/sim/CodeSourcery/SGL/bin/arm-none-eabi-nm: 'vmlinux': No such file
make: [vmlinux] Error 1 (ignored)
  SYSMAP  .tmp_System.map
/home/sim/CodeSourcery/SGL/bin/arm-none-eabi-nm: '.tmp_vmlinux2': No such file
make: [vmlinux] Error 1 (ignored)
make[1]: *** No rule to make target `vmlinux', needed by `arch/arm/boot/Image'.  Stop.
make: [zImage] Error 2 (ignored)

The command I use to build is:

ARCH=arm CROSS_COMPILE=/home/sim/CodeSourcery/SGL/bin/arm-none-eabi- make

Am I doing something wrong?

@KalleD

seems that there is a 60 fps cap inbuilt into the Arc kernel... how to remove this fps cap?

why would you need to?

Sent from The Arc!

Originally Posted by im_iceman

why would you need to?

Sent from The Arc!

Higher benchmarking and to see the full power ( i think)