pbatard / bootimg-tools Goto Github PK
View Code? Open in Web Editor NEWAndroid boot.img creation and extraction tools [NOTE: This project is NO LONGER maintained]
License: Apache License 2.0
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Stepper Driver Current Adjust Marking is Wrong
MAX is actually MIN, we can measure TP1 voltage to make sure output current is MAX when TP1 = +5V or +3.3V
Now when we turn the switch to "MAX", TP1 voltage is 1.2V, which causes stepper output torque is only 1/5 of 0.2Nm.
Broken boot.img if mkbootimg called on modified ramdisk.cpio.gz
$ # Unpack boot.img (retrieved from boot partition of Android device)
$ unmkbootimg -i boot.img
kernel written to 'kernel' (6718296 bytes)
ramdisk written to 'ramdisk.cpio.gz' (708213 bytes)
To rebuild this boot image, you can use the command:
mkbootimg --base 0 --pagesize 2048 --kernel_offset 0x80208000 --ramdisk_offset 0x82200000 --second_offset 0x81100000 --tags_offset 0x80200100 --cmdline 'console=ttyHSL0,115200,n8 androidboot.hardware=flo user_debug=31 msm_rtb.filter=0x3F ehci-hcd.park=3 vmalloc=340M' --kernel kernel --ramdisk ramdisk.cpio.gz -o boot.img
$ # Repack without modifications
$ mkbootimg --base 0 --pagesize 2048 --kernel_offset 0x80208000 --ramdisk_offset 0x82200000 --second_offset 0x81100000 --tags_offset 0x80200100 --cmdline 'console=ttyHSL0,115200,n8 androidboot.hardware=flo user_debug=31 msm_rtb.filter=0x3F ehci-hcd.park=3 vmalloc=340M' --kernel kernel --ramdisk ramdisk.cpio.gz -o boot.img
$ # boot using new boot.img (whose size actually differ from original boot.img)
$ fastboot boot boot.img
This works well only when used on unmodified ramdisk.
However, same process end up with a broken boot.img if, say something is changed in default.prop, something as trivial as ro.debuggable=1.
Is this a known issue or am I just being stupid with my approach?
PS: My usual commands to unpack, pack cpio.gz are:
$ # unpack
$ gunzip ramdisk.cpio.gz
$ cpio -i < ../ramdisk.cpio
$ # pack
$ find . | cpio -o -H newc | gzip > ../myramdisk.cpio.gz
undefined reference to `fs_config'
gcc mkbootfs.c -o mkbootfs -I../include
/tmp/ccHBJe3S.o: In function `fix_stat':
mkbootfs.c:(.text+0x247): undefined reference to `fs_config'
collect2: error: ld returned 1 exit status
can not support latest boot.img format
It does not support latest Android boot.img created from "system/core/mkbootimg/mkbootimg", it's a python script.
Nexus 9 Tegra Kernel
I am using unmkbootimg program to extract the boot.img image that I got from factory image from Google. but it says "error: not an Android boot image". Could you please help me with this?
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