Kernel Project by Team ThunderStorms
ThunderStorms kernel is based on Cruel Kernel - big thanks and credits to Cruel Kernel Team.
Based on samsung sources and android common tree. Supported devices: G980F G981B G985F G986B G988B N985F N986B
- Exynoobs Team
- Switch-Gott
- Jesse Chan (jesec)
- CruelKernel
- @evdenis - for kernel source and updates from Samsung source, toolchains
First of all, TWRP Recovery + multidisabler should be installed in all cases. It's a preliminary step. Next, backup your existing kernel. You will be able to restore it from TWRP Recovery in case of problems.
Reboot to TWRP Recovery. Flash boot.img in boot slot.
Reboot to Download Mode.
$ sudo heimdall flash --BOOT boot.imgFlash boot.img with FK Manager.
The problem is not in sources. It's due to os_patch_level mismatch with you current kernel (and/or twrp). CruelKernel/ThunderStorms uses common security patch date to be in sync with the official twrp and samsung firmware. You can check the default os_patch_level in build.mkbootimg.* files. However, this date can be lower than other kernels use. When you flash a kernel with an earlier patch date on top of the previous one with a higher date, android activates rollback protection mechanism and you face the pin problem. It's impossible to use a "universal" os_patch_level because different users use different custom kernels and different firmwares. CruelKernel uses the common date by default in order to suite most of users.
How can you solve the problem? 6 different ways:
- You can restore your previous kernel and unlock problem will gone in TWRP to set the os_patch_level date for your boot and recovery partitions to 2099-12. You can use other than 2099-12 date in the zip filename. You need to set it to the same or greater date as your previous kernel. Nemesis and Los (from ivanmeller) kernels use 2099-12. Max possible date is: 2127-12. It will be used if there will be no date in the zip filename.
- You can check the os_patch_level date of your previous kernel here https://cruelkernel.org/tools/bootimg/ and patch cruel kernel image to the same date. If your previous kernel is nemesis, patch cruel to 2099-12 date.
- You can reboot to TWRP, navigate to data/system and delete 3 files those names starts with 'lock'. Reboot. Login, set a new pin. To fix samsung account login, reinstall the app
- You can rebuild cruel kernel with os_patch_level that suites you. To do it, you need to add the line os_patch_level="<your date>" to the main.yml cruel configuration. See the next section if you want to rebuild the kernel.
- You can do the full wipe during cruel kernel flashing
This instructions assumes you are using Linux. Install heimdall if you want to flash the kernel automatically.
Next:
# Install prerequisites
# If you use ubuntu or ubuntu based distro then you need to install these tools:
$ sudo apt-get install build-essential libncurses-dev libtinfo5 bc bison flex libssl-dev libelf-dev
# If you use Fedora:
$ sudo dnf group install "Development Tools"
$ sudo dnf install ncurses-devel ncurses-compat-libs bc bison flex elfutils-libelf-devel openssl-devel
# Install mkbootimg
$ wget -q https://android.googlesource.com/platform/system/tools/mkbootimg/+archive/refs/heads/master.tar.gz -O - | tar xzf - mkbootimg.py
$ chmod +x mkbootimg.py
$ sudo mv mkbootimg.py /usr/local/bin/mkbootimg
# Get the sources
$ git clone https://github.com/ThunderStorms21th/Galaxy-S20
$ cd Galaxy-S20
# List available branches
$ git branch -a | grep remotes | grep ts | cut -d '/' -f 3
# Switch to the branch you need
$ git checkout master
# Install compilers
$ git submodule update --init --recursive
# Compile
$ ./ts-build.sh- default - standard toolchain from Samsung's kernel archives for S20/Note20 models (clang8.0.8/gcc4.9)
- clang - standard toolchain from Google's clang archives (clang14.0.1/gcc4.9)
Best Overview can be found interviewing the chef who cooked the dish! Linux kernel release notes are linked for refernce http://kernel.org/
Although originally developed first for 32-bit x86-based PCs (386 or higher), today Linux also runs on devices with very least of hardware
Linux is easily portable to most general-purpose 32- or 64-bit architectures as long as they have a paged memory management unit (PMMU) and a port of the GNU C compiler (gcc) (part of The GNU Compiler Collection, GCC)
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There is a lot of documentation available both in electronic form on the Internet and in books, both Linux-specific and pertaining to general UNIX questions. I'd recommend looking into the documentation subdirectories on any Linux FTP site for the LDP (Linux Documentation Project) books. This README is not meant to be documentation on the system: there are much better sources available.
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There are various README files in the Documentation/ subdirectory: these typically contain kernel-specific installation notes for some drivers for example. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Changes file, as it contains information about the problems, which may result by upgrading your kernel.
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The Documentation/DocBook/ subdirectory contains several guides for kernel developers and users. These guides can be rendered in a number of formats: PostScript (.ps), PDF, HTML, & man-pages, among others. After installation, "make psdocs", "make pdfdocs", "make htmldocs", or "make mandocs" will render the documentation in the requested format.
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If you install the full sources, put the kernel tarball in a directory where you have permissions (eg. your home directory) and unpack it:
gzip -cd linux-4.X.tar.gz | tar xvf -
or
bzip2 -dc linux-4.X.tar.bz2 | tar xvf -
Replace "X" with the version number of the latest kernel.
Do NOT use the /usr/src/linux area! This area has a (usually incomplete) set of kernel headers that are used by the library header files. They should match the library, and not get messed up by whatever the kernel-du-jour happens to be.
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You can also upgrade between 4.x releases by patching. Patches are distributed in the traditional gzip and the newer bzip2 format. To install by patching, get all the newer patch files, enter the top level directory of the kernel source (linux-4.X) and execute:
gzip -cd ../patch-4.x.gz | patch -p1
or
bzip2 -dc ../patch-4.x.bz2 | patch -p1
Replace "x" for all versions bigger than the version "X" of your current source tree, in_order, and you should be ok. You may want to remove the backup files (some-file-name~ or some-file-name.orig), and make sure that there are no failed patches (some-file-name# or some-file-name.rej). If there are, either you or I have made a mistake.
Unlike patches for the 4.x kernels, patches for the 4.x.y kernels (also known as the -stable kernels) are not incremental but instead apply directly to the base 4.x kernel. For example, if your base kernel is 4.0 and you want to apply the 4.0.3 patch, you must not first apply the 4.0.1 and 4.0.2 patches. Similarly, if you are running kernel version 4.0.2 and want to jump to 4.0.3, you must first reverse the 4.0.2 patch (that is, patch -R) before applying the 4.0.3 patch. You can read more on this in Documentation/applying-patches.txt
Alternatively, the script patch-kernel can be used to automate this process. It determines the current kernel version and applies any patches found.
linux/scripts/patch-kernel linux
The first argument in the command above is the location of the kernel source. Patches are applied from the current directory, but an alternative directory can be specified as the second argument.
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Make sure you have no stale .o files and dependencies lying around:
cd linux make mrproper
You should now have the sources correctly installed.
Compiling and running the 4.x kernels requires up-to-date versions of various software packages.Beware that using excessively old versions of these packages can cause indirect errors that are very difficult to track down, so don't assume that you can just update packages when obvious problems arise during build or operation.
When compiling the kernel, all output files will per default be stored together with the kernel source code. Using the option "make O=output/dir" allow you to specify an alternate place for the output files (including .config). Example:
kernel source code: /usr/src/linux-4.X
build directory: /home/name/build/kernel
To configure and build the kernel, use:
cd /usr/src/linux-4.X
make O=/home/name/build/kernel menuconfig
make O=/home/name/build/kernel
sudo make O=/home/name/build/kernel modules_install install
Please note: If the 'O=output/dir' option is used, then it must be used for all invocations of make.
Do not skip this step even if you are only upgrading one minor version. New configuration options are added in each release, and odd problems will turn up if the configuration files are not set up as expected. If you want to carry your existing configuration to a new version with minimal work, use "make oldconfig", which will only ask you for the answers to new questions.
make config : Plain text interface.
make menuconfig : Text based color menus, radiolists & dialogs.
make nconfig : Enhanced text based color menus.
make xconfig : X windows (Qt) based configuration tool.
make gconfig : X windows (Gtk) based configuration tool.
make oldconfig : Default all questions based on the contents of
your existing ./.config file and asking about
new config symbols.
make silentoldconfig : Like above, but avoids cluttering the screen
with questions already answered. Additionally updates the dependencies.
make olddefconfig : Like above, but sets new symbols to their default
values without prompting.
make defconfig : Create a ./.config file by using the default
symbol values from either arch/$ARCH/defconfig
or arch/$ARCH/configs/${PLATFORM}_defconfig,
depending on the architecture.
make ${PLATFORM}_defconfig : Create a ./.config file by using the default
symbol values from arch/$ARCH/configs/${PLATFORM}_defconfig.
symbol values from Use "make help" to get a list of all available platforms of your architecture.
make allyesconfig : Create a ./.config file by setting symbol
values to 'y' as much as possible.
make allmodconfig : Create a ./.config file by setting symbol
values to 'm' as much as possible.
make allnoconfig : Create a ./.config file by setting symbol
values to 'n' as much as possible.
make randconfig : Create a ./.config file by setting symbol
values to random values.
make localmodconfig : Create a config based on current config and
loaded modules (lsmod). Disables any module
option that is not needed for the loaded modules.
To create a localmodconfig for another machine,
store the lsmod of that machine into a file
and pass it in as a LSMOD parameter.
target$ lsmod > /tmp/mylsmod
target$ scp /tmp/mylsmod host:/tmp
host$ make LSMOD=/tmp/mylsmod localmodconfig
The above also works when cross compiling.
make localyesconfig : Similar to localmodconfig, except it will convert
all module options to built in (=y) options.
You can find more information on using the Linux kernel config tools in Documentation/kbuild/kconfig.txt.
- Having unnecessary drivers will make the kernel bigger, and can
under some circumstances lead to problems: probing for a
nonexistent controller card may confuse your other controllers
- Compiling the kernel with "Processor type" set higher than 386
will result in a kernel that does NOT work on a 386. The
kernel will detect this on bootup, and give up.
- A kernel with math-emulation compiled in will still use the
coprocessor if one is present: the math emulation will just
never get used in that case. The kernel will be slightly larger,
but will work on different machines regardless of whether they
have a math coprocessor or not.
- The "kernel hacking" configuration details usually result in a
bigger or slower kernel (or both), and can even make the kernel
less stable by configuring some routines to actively try to
break bad code to find kernel problems (kmalloc()). Thus you
should probably answer 'n' to the questions for "development",
"experimental", or "debugging" features.
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Make sure you have at least gcc available. For more information, refer to Documentation/Changes.
Please note that you can still run a.out user programs with this kernel.
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Do a "make" to create a compressed kernel image. It is also possible to do "make install" if you have lilo installed to suit the kernel makefiles, but you may want to check your particular lilo setup first.
To do the actual install, you have to be root, but none of the normal build should require that. Don't take the name of root in vain.
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If you configured any of the parts of the kernel as `modules', you will also have to do "make modules_install".
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Verbose kernel compile/build output:
Normally, the kernel build system runs in a fairly quiet mode (but not totally silent). However, sometimes you or other kernel developers need to see compile, link, or other commands exactly as they are executed. For this, use "verbose" build mode. This is done by inserting "V=1" in the "make" command. E.g.:
make V=1 all
To have the build system also tell the reason for the rebuild of each target, use "V=2". The default is "V=0".
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Keep a backup kernel handy in case something goes wrong. This is especially true for the development releases, since each new release contains new code which has not been debugged. Make sure you keep a backup of the modules corresponding to that kernel, as well. If you are installing a new kernel with the same version number as your working kernel, make a backup of your modules directory before you do a "make modules_install".
Alternatively, before compiling, use the kernel config option "LOCALVERSION" to append a unique suffix to the regular kernel version. LOCALVERSION can be set in the "General Setup" menu.
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In order to boot your new kernel, you'll need to copy the kernel image (e.g. .../linux/arch/i386/boot/bzImage after compilation) to the place where your regular bootable kernel is found.
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Booting a kernel directly from a floppy without the assistance of a bootloader such as LILO, is no longer supported.
If you boot Linux from the hard drive, chances are you use LILO, which uses the kernel image as specified in the file /etc/lilo.conf. The kernel image file is usually /vmlinuz, /boot/vmlinuz, /bzImage or /boot/bzImage. To use the new kernel, save a copy of the old image and copy the new image over the old one. Then, you MUST RERUN LILO to update the loading map!! If you don't, you won't be able to boot the new kernel image.
Reinstalling LILO is usually a matter of running /sbin/lilo. You may wish to edit /etc/lilo.conf to specify an entry for your old kernel image (say, /vmlinux.old) in case the new one does not work. See the LILO docs for more information.
After reinstalling LILO, you should be all set. Shutdown the system, reboot, and enjoy!
If you ever need to change the default root device, video mode, ramdisk size, etc. in the kernel image, use the 'rdev' program (or alternatively the LILO boot options when appropriate). No need to recompile the kernel to change these parameters.
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Reboot with the new kernel and enjoy.
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If you have problems that seem to be due to kernel bugs, please check the file MAINTAINERS to see if there is a particular person associated with the part of the kernel that you are having trouble with. If there isn't anyone listed there, then the second best thing is to mail them to me ([email protected]), and possibly to any other relevant mailing-list or to the newsgroup.
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In all bug-reports, please tell what kernel you are talking about, how to duplicate the problem, and what your setup is (use your common sense). If the problem is new, tell me so, and if the problem is old, please try to tell me when you first noticed it.
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If the bug results in a message like
unable to handle kernel paging request at address C0000010 Oops: 0002 EIP: 0010:XXXXXXXX eax: xxxxxxxx ebx: xxxxxxxx ecx: xxxxxxxx edx: xxxxxxxx esi: xxxxxxxx edi: xxxxxxxx ebp: xxxxxxxx ds: xxxx es: xxxx fs: xxxx gs: xxxx Pid: xx, process nr: xx xx xx xx xx xx xx xx xx xx xx
or similar kernel debugging information on your screen or in your system log, please duplicate it exactly. The dump may look incomprehensible to you, but it does contain information that may help debugging the problem. The text above the dump is also important: it tells something about why the kernel dumped code (in the above example, it's due to a bad kernel pointer). More information on making sense of the dump is in Documentation/oops-tracing.txt
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If you compiled the kernel with CONFIG_KALLSYMS you can send the dump as is, otherwise you will have to use the "ksymoops" program to make sense of the dump (but compiling with CONFIG_KALLSYMS is usually preferred). This utility can be downloaded from ftp://ftp..kernel.org/pub/linux/utils/kernel/ksymoops/ . Alternatively, you can do the dump lookup by hand:
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In debugging dumps like the above, it helps enormously if you can look up what the EIP value means. The hex value as such doesn't help me or anybody else very much: it will depend on your particular kernel setup. What you should do is take the hex value from the EIP line (ignore the "0010:"), and look it up in the kernel namelist to see which kernel function contains the offending address.
To find out the kernel function name, you'll need to find the system binary associated with the kernel that exhibited the symptom. This is the file 'linux/vmlinux'. To extract the namelist and match it against the EIP from the kernel crash, do:
nm vmlinux | sort | less
This will give you a list of kernel addresses sorted in ascending order, from which it is simple to find the function that contains the offending address. Note that the address given by the kernel debugging messages will not necessarily match exactly with the function addresses (in fact, that is very unlikely), so you can't just 'grep' the list: the list will, however, give you the starting point of each kernel function, so by looking for the function that has a starting address lower than the one you are searching for but is followed by a function with a higher address you will find the one you want. In fact, it may be a good idea to include a bit of "context" in your problem report, giving a few lines around the interesting one.
If you for some reason cannot do the above (you have a pre-compiled kernel image or similar), telling me as much about your setup as possible will help. Please read the REPORTING-BUGS document for details.
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Alternatively, you can use gdb on a running kernel. (read-only; i.e. you cannot change values or set break points.) To do this, first compile the kernel with -g; edit arch/i386/Makefile appropriately, then do a "make clean". You'll also need to enable CONFIG_PROC_FS (via "make config").
After you've rebooted with the new kernel, do "gdb vmlinux /proc/kcore". You can now use all the usual gdb commands. The command to look up the point where your system crashed is "l *0xXXXXXXXX". (Replace the XXXes with the EIP value.)
gdb'ing a non-running kernel currently fails because gdb (wrongly) disregards the starting offset for which the kernel is compiled.