tag:blogger.com,1999:blog-59950474744976692372024-08-29T05:49:29.700-07:00Tech BlogUnknownnoreply@blogger.comBlogger1125tag:blogger.com,1999:blog-5995047474497669237.post-26273687489773669312011-04-28T05:57:00.001-07:002011-04-28T06:19:44.028-07:00How to extract system.img<div dir="ltr" style="text-align: left;" trbidi="on"><b><span style="font-size: x-small;">Extract NAND image files</span></b><br />
To extract .img files, visit <a href="http://code.google.com/p/unyaffs/" rel="nofollow" target="_blank">http://code.google.com/p/unyaffs/</a> I have compiled it under ubuntu 64 (attached). Unyaffs works on system.img but on no other .img file<br />
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To extract boot.img use attached extract-kernel.pl and extract-ramdisk.pl<br />
# extract-kernel.pl boot.img<br />
# extract-ramdisk.pl boot.img<br />
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Should work for recovery.img.<br />
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<b><span style="font-size: x-small;">Rebuild system.img</span></b><br />
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You just need "to loopback mount an image on your linux box and format it with YAFFS". <br />
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But it is useless as because Hero's SPL does not allow flashing system.img directly. You should use an update.zip package for that. (read below)<br />
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<b><span style="font-size: x-small;">Rebuild boot.img</span></b><br />
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After extracting your boot.img using attached extract-*.pl and tweaking it, in same folder run:<br />
# mkbootfs boot.img-ramdisk | gzip > ramdisk-boot<br />
# mkbootimg --kernel boot.img-kernel --ramdisk ramdisk-boot --cmdline "no_console_suspend=1 console=null" -o newBoot.img --base 0x19200000<br />
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<b><span style="font-size: x-small;">Creating an update.zip package</span></b><br />
Creating an update.zip package is quite easy in fact. For example, to add a (valid) test.apk package to your rom:<br />
<br />
- create an empty folder <workdir><br />
- create folder structure for test.apk (<workdir>/system/app) and copy the test.apk<br />
- create folder structure for update-script (<workdir>/META-INF/com/google/android)<br />
- edit <workdir>/META-INF/com/google/android/update-script<br />
- put in it:<br />
<br />
- compress the <workdir> content to zip (not the <workdir> folder itself)<br />
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Now you are going to sign the zip file. Download attached testsign.zip and copy it in your <SDK>/tools folder. Extract it here. It should create a sign subfolder with a testsign.jar file in it.<br />
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Then, from <workdir> folder, do:<br />
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java -classpath <SDK>/tools/sign/testsign.jar" testsign file.zip file-signed.zip<br />
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Ok, now your zip file is ready to be deployed using cyanogen recovery image. <br />
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To find more command to use in update-script, look at other's.<br />
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<b><span style="font-size: x-small;">Modify .apk package</span></b><br />
Seems it is easy to uncompress an .apk package (zip) an to modify files in it and then compress it. But after all: you must sign it like update.zip packages. <br />
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<b><span style="font-size: x-small;"></span></b> <br />
<b><span style="font-size: x-small;">Porting an other device's rom</span></b><br />
<br />
- extract the system.img<br />
- extract boot.img<br />
- replace boot.img-kernel with the one from your stock Hero rom one.<br />
- rebuild boot.img<br />
- build update.zip package (look someone's hero custom rom to see how to do it)<br />
- sign and flash<br />
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<span style="font-size: medium;"><b></b></span></div>Unknownnoreply@blogger.com0