salut banget sama SE.. :D On Mon, May 9, 2011 at 1:27 PM, jimmy cheung <[email protected]> wrote:
> Makin mantap aja nih SE, kaya' nya belajar dari pengalaman terdahulu nih, > skrg malah dimanja abis... :) > > back to journey from otuex > On 9 May 2011 11:00, "Rheza Christian" <[email protected]> wrote: > > Sebelumnya SE post official guide buat unlock boot loader. Skr costum > > kernel? What do you think suhu suhi id-android? > > > > ------------------------------------------ > > > > Sony Ericsson blog has posted post on how to build custom kernel....they > > also mentioned that they would be monitoring xda forum > > > > Since the launch of the unlock boot loader site, we have received a lot > of > > really great feedback. The Sony Ericsson Developer Program wants to > continue > > to build on this open dialogue with external developers. > > > > Developers and advanced users can now unlock the boot loader, which is > the > > first step to be able to flash your own image. Now we have seen quite a > few > > comments in different forums like the XDA forum, where developers run > into > > problems when building their own image, and and trying to flash the image > > using Fastboot.*With the help of our Master Software Architect, James > > Jacobsson, we put together a short article on how to do this. > > > > Before moving on, we’d like to remind you again*that there is no turning > > back when unlocking the boot loader. You may void the warranty of the > phone, > > and you will not be able to revert the phone to a locked or original > state > > if you unlock it. > > > > What is the Linux kernel? > > The Xperia™ line of smartphones run on the Android™, the mobile operating > > system based on the Linux kernel. Though it is only a small part of the > > operating system, the kernel ensures that all other processes in the > system > > are synchronized to work together properly. > > > > Why rebuild the kernel?* > > Rebuilding the kernel enables end users to make modifications to their > > devices that are normally not intended by the device manufacturer, such > as > > theming the device by changing system icons and removing/modifying system > > components.*Please note that*Sony Ericsson is not recommending this. * > > > > Considerations before building your own kernel and reflashing your device > > As mentioned in the beginning of this article, the first step is to > unlock > > the boot loader. When the boot loader is unlocked, the sensitive data is > > removed, such as DRM certificates, and the user partition of the file > system > > is wiped out. But all other functionality, such as the camera and other > > drivers, is left intact. Please note that content, like music files, that > > require the DRM certificate will not be accessible any more. But most > > importantly, you may void the warranty of your phone if you decide to > unlock > > it. Aside from the considerations mentioned above, the functionality is > > there, just waiting for you to take advantage of it. So, if you’re ready, > > here’s how to get started. > > > > Building the kernel > > It takes a few main steps to build the kernel. Below we’ll*show you how > to > > build a Linux kernel and flash it onto the device. > > > > Step*A – Download the necessary software > > Download the following software to get started: > > > > The kernel source code can be downloaded from the copyleft archives on > Sony > > Ericsson Developer World.*You*can use the file > > called*3.0.A.2.181_182.tar.bz2*for our*Android™*Gingerbread devices.*This > is > > the source code for the Linux kernel as used in the Xperia™ PLAY. > > The Fastboot client which is part of the Android SDK. This is the > standard > > Android flashing utility. This allows you to flash the image you are > about > > to create onto the device. > > The Init RAM disk. The initial RAM disk (also known as the initrd) is the > > initial filesystem that the kernel will mount and start running processes > > off. You can configure the Init RAM disk to grant root access. How you > > create or download your own Init RAM disk is beyond the scope of this > > article. > > The ARM cross-compiler. A cross-compiler is used to build ARM binaries on > a > > different architecture, such as x86. This allows you to compile software > > (such as the kernel) into a format that the device can run. We recommend > > getting the CodeSourcery Lite compiler, especially the GNU/Linux variant, > as > > you’ll need that if you want to build binaries for a full-blown Linux > system > > on the device later. However, any EABI ARM compiler capable of compiling > the > > Linux kernel should be enough for this step. > > Step*B – Building the kernel > > To build the kernel, you first need to*unpack the kernel.*Once you’ve > > unpacked the kernel, you need to configure it, and then build it. The > > example below is based on you using the > file*called*3.0.A.2.181_182.tar.bz2. > > > > 1.*Go into the kernel directory: > > > > cd kernel > > > > 2.*Configure the kernel: > > > > ARCH=arm CROSS_COMPILE=/opt/arm-2010q1/bin/arm-none-eabi- make > > semc_zeus_defconfig > > > > Note: Replace /opt/arm-2010q1 with where you installed your > cross-compiler. > > Also, this example is for Xperia™ PLAY. Replace defconfig with the > following > > values depending on what device you want to configure it for: > > > > Xperia™ PLAY semc_zeus_defconfig > > Xperia™ arc semc_anzu_defconfig > > Xperia™ neo semc_hallon_defconfig > > 3.*Build the kernel: > > > > ARCH=arm CROSS_COMPILE=/opt/arm-2010q1/bin/arm-none-eabi- make > > > > Replace /opt/arm-2010q1 with where you installed your cross-compiler. > Once > > done, you should*have a compressed kernel-image in arch/arm/boot/zImage. > > > > Step*C – Getting a RAM disk > > The RAM disk is the initial filesystem the kernel will mount before > > transferring control to userspace. How you create your own root > filesystem > > is beyond the scope of this article, but you can use the following > > instructions to pack/unpack the file. > > > > Unpacking (you have ramdisk.img, and want to create a directory of files > out > > of it): > > > > gzip -d - < ramdisk.img > cpio -idm > > > > Packing (You have directory of files, and want to create ramdisk.img from > > it): > > > > find . | cpio --quiet -H newc -o | gzip > ramdisk.img > > > > Step*D – Assembling the boot.img > > Now that we have all the parts we need to create a flashable file. The > next > > stop is to package the parts. To do this, you’ll need the program > mkbootimg, > > which is part of the standard Android tree. If you don’t feel like > compiling > > all of Android to get this tool, it is available to download from various > > trusted sites on the Internet. > > > > Once you have the tool, this is the command to combine your kernel and > RAM > > disk into a flashable file: > > > > mkbootimg --base 0x00200000 --kernel kernel/arch/arm/boot/zImage > --ramdisk > > ramdisk.img -o boot.img > > > > Step*E – Flashing the file > > You should flash the file using Fastboot. If you’ve unlocked the boot > loader > > on your device, you already have Fastboot. > > > > 1. To flash the boot.img file, use the following the command: > > > > fastboot –i 0x0fce flash boot boot.img > > > > 2. Now, it will prompt you to connect your device. To do so, follow these > > simple steps: > > > > Make sure your device is powered down. > > Hold down the Search button (Xperia™ PLAY only) or the Back button (all > > other Xperia™ devices). The device’s notification light should shine blue > to > > confirm it’s in Fastboot mode. > > Connect the USB cable. > > Flashing should now start and complete. > > 3.*As a last step in the process, you need to reboot the device.*You > > can*either remove the USB cable and battery to power the device down. If > you > > prefer, you can instead*issue the following command (either method will > > work): > > > > fastboot –i 0x0fce reboot > > > > Important information! > > Sony Ericsson does not guarantee any support on this, but we will monitor > > the Building the Linux kernel for Xperia phones thread on the XDA > Developers > > forum. However, we cannot guarantee an answer for every question asked in > > this forum. > > > > Additional information for experienced Linux kernel experts > > The kernel is pretty standard, all the regular things you’re used to is > > there, and available to use. Things that are different are the memory > config > > and the kernel commandline. The memory config is hardcoded (i.e., ATAGs > > aren’t used for this). It’s set in the board-file for your target, such > as > > kernel/arch/arm/mach-msm/board-semc_zeus.c in the function msm7x30_fixup. > > The kernel commandline is also not fetched from the boot.img file, but > > compiled into the kernel (CONFIG_CMDLINE). Some arguments are also added > > from the boot loader. > > > > Additional information if porting non-Linux format files to the device > > The boot loader will accept any reasonably formatted boot.img file. For > > example, at the*Android Kernel Git, you will see the format of the > boot.img > > file. This allows you to create a boot.img file containing two loadable > > files (kernel+ramdisk), which will get loaded into RAM. Once the boot > loader > > is loaded, it passes*the control to the first instruction of the loaded > > kernel image. 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