Hi,
so my PW3 is on firmware 5.10.1.1 currently, and the kexec syscall is disabled (it seems like it was enabled some time ago
https://wiki.mobileread.com/wiki/Kin...el_Development ). So ideally I'd like a solution that doesn't require flashing to boot another kernel (so that it can be distributed without bricking people's devices), but it should also work without a pc.
To start out I'd also like to try the tethered variant as well (I can't find it right now but I read somewhere that using the bootloader a kernel can also just be written into RAM and booted from there). This is probably the most stupid question but in this guide
Quote:
Bring the Kindle into bootloader mode by:
- Pressing the power button until power LED goes off.
- Keep on pressing power button and start pressing the "magic" key.
- Release power button while still pressing "magic" key.
- Release "magic" key.
|
what is the "magic key" (which seemingly was the home button on older models) on a PW3 which only has literally 1 button - the power one?
To boot another kernel without a kernel and without the kexec syscall enabled, there seems to be the possibility to make kexec a module, which can then be loaded. See this:
https://github.com/amonakov/kexec-module
But I just can't get the .ko out of it. I cloned the repo besides the kernel folder (the latter I build already) and modified the Makefile for the kernel part in the following way:
Code:
[simon@yogal390 kernel]$ cat Makefile
KDIR ?= ../../linux-3.0.35
ARCH ?= arm
MYPWD ?= /home/simon/Downloads/gplrelease/kexec-module/kernel
default: orig
$(MAKE) -C $(KDIR) -I$(MYPWD)
orig:
mkdir $@
ln -s $(KDIR)/arch/$(ARCH)/kernel/relocate_kernel.S
ln -s $(KDIR)/arch/$(ARCH)/kernel/machine_kexec.c $@/
ln -s $(KDIR)/kernel/kexec.c $@/
And can actually compile like this (which is pretty much amazing considering this was made for another kernel version):
Code:
[simon@yogal390 kernel]$ make ARCH=arm CROSS_COMPILE=/usr/bin/arm-linux-gnueabihf-
make -C ../../linux-3.0.35 -I/home/simon/Downloads/gplrelease/kexec-module/kernel
make[1]: Verzeichnis „/home/simon/Downloads/gplrelease/linux-3.0.35“ wird betreten
CHK include/linux/version.h
CHK include/generated/utsrelease.h
make[2]: „include/generated/mach-types.h“ ist bereits aktuell.
CALL scripts/checksyscalls.sh
CHK include/generated/compile.h
Kernel: arch/arm/boot/Image is ready
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
Building modules, stage 2.
MODPOST 36 modules
make[1]: Verzeichnis „/home/simon/Downloads/gplrelease/linux-3.0.35“ wird verlassen
[simon@yogal390 kernel]$ ls
built-in.o kexec.c kexec-mod.h Makefile relocate_kernel.S
Kbuild kexec-drv.c machine_kexec.c orig
But no built module to be found... But maybe that's because I don't quite grasp how it should build, and it doesn't do anything with that code from the repository.
What this approach stems from is the kindle fire actually:
https://forum.xda-developers.com/ama...-ford-t3270272
Has anybody toyed with stuff like this since the kexec syscall is gone? How have you gone about it? Essentially I just want to boot a kernel with the risk of permanent damage
