I think the time has come to share the info about kernel development we've been keeping for ourselves until now. just be sure to ready the complete thread and not just execute everything without thinking. I won't be responsible for any bricks etc.
Warnings!!
- Only start with a kernel if you are a developer with knowledge about kernel developping.
- Always use the specific dt.img build for your kernel!!!!! Very important!
- Don't complain if it doesn't work when you do something wrong!
== Information ==
Let's start with some info first.
MSM8974 needs something new to build a kernel, this is called a dt.img. This basically is an img file which holds information about the board pagesize, kernel version and some other kernel related things. You can only use a specific dt.img with a kernel, this file needs to be generated by a binary called dtbTool. This bin4ry can be found in the Cyanogen repo's or you can download a prebuild one in this thread.
== Compiling a kernel ==
I'll skip this part for now, every kernel dev should know this part maybe I'll add it later.
== Generating a dt.img ==
Basically you will only need your kernel sources and the dtbTool binary, then you need to generate it using a command like this:
This seems very simple but it's quite important when building a kernel for MSM8974, or other S800 boards.
After this step has been completed you will find your dt.img in a folder callled dt_files, this folder should be in your home of linux now.
== Making the actual boot.img ==
After making the zImage and dt.img you need to have your ramdisk and an mkbootimg adapted for the dt.img to make a booting/working kernel for our rhine board.
be sure the naming of your files is correct:
- zImage
- dt.img
- intrd.img for your ramdisk
You can generate it by using the following command:
Let's get kernel development started for everyone!
== Extra ==
If you like my work consider donating me a beer
Warnings!!
- Only start with a kernel if you are a developer with knowledge about kernel developping.
- Always use the specific dt.img build for your kernel!!!!! Very important!
- Don't complain if it doesn't work when you do something wrong!
== Information ==
Let's start with some info first.
MSM8974 needs something new to build a kernel, this is called a dt.img. This basically is an img file which holds information about the board pagesize, kernel version and some other kernel related things. You can only use a specific dt.img with a kernel, this file needs to be generated by a binary called dtbTool. This bin4ry can be found in the Cyanogen repo's or you can download a prebuild one in this thread.
== Compiling a kernel ==
I'll skip this part for now, every kernel dev should know this part maybe I'll add it later.
== Generating a dt.img ==
Basically you will only need your kernel sources and the dtbTool binary, then you need to generate it using a command like this:
Code:
./dtbTool -o ~/dt_files/dt.img -s 2048 -p ./scripts/dtc/ ./arch/arm/boot/
This seems very simple but it's quite important when building a kernel for MSM8974, or other S800 boards.
After this step has been completed you will find your dt.img in a folder callled dt_files, this folder should be in your home of linux now.
== Making the actual boot.img ==
After making the zImage and dt.img you need to have your ramdisk and an mkbootimg adapted for the dt.img to make a booting/working kernel for our rhine board.
be sure the naming of your files is correct:
- zImage
- dt.img
- intrd.img for your ramdisk
You can generate it by using the following command:
Code:
./mkbootimg --base 0x00000000 --kernel zImage --ramdisk_offset 0x02000000 --tags_offset 0x01E00000 --pagesize 2048 --cmdline "androidboot.hardware=qcom user_debug=31 maxcpus=2 msm_rtb.filter=0x3F ehci-hcd.park=3 msm_rtb.enable=0 lpj=192598 dwc3.maximum_speed=high dwc3_msm.prop_chg_detect=Y" --ramdisk initrd.img --dt dt.img -o boot.img
Let's get kernel development started for everyone!
== Extra ==
If you like my work consider donating me a beer
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