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Help installing kernel image

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bsammon
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Default Help installing kernel image

I've been running Linux (debian/ubuntu based on rabits's stuff) on my tablet, with no ability to (easily) boot Android, for a few months now.
My System partition still has 9.4.5.26 on it, and I'd like to reinstall a 9.4.5.26 kernel, without wiping my System partition, so I can switch back to Android.

I've (I think) extracted a kernel image and a ramdisk image from a 9.4.5.26 install image, and I'm trying to create a install image containing just the kernel and ramdisk, and copy it to the Staging partition with dd.

I've created a Makefile to create the blobfile, and (seemingly) successfully created the blobfile, but after I do the dd, and reboot, debian/ubuntu boots as usual, instead of some kind of install process.

I've included the Makefile that I'm using below.

Any idea what I'm doing wrong, or what's wrong with my expectations?
Something I have yet to try is an alternative to dd (such as fastboot or nvflash)
Also, maybe I'd have better luck trying to create something that I could install from TWRP.

Code:
Select Code
kern = zImage
bootimg_filename = boot.img
blobpack = ./blobpack
blob_img = blob.LNX
recovery_part = /dev/mmcblk0p4

$(bootimg_filename) : initrd.img $(kern)
        abootimg --create $(bootimg_filename) -k $(kern) -r initrd.img

blob.LNX: $(bootimg_filename)
        $(blobpack) blob.LNX LNX $(bootimg_filename)

install.dd:
        dd if=$(blob_img) of=$(recovery_part)
 
lj50036
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Quote:
Originally Posted by bsammon View Post
I've been running Linux (debian/ubuntu based on rabits's stuff) on my tablet, with no ability to (easily) boot Android, for a few months now.
My System partition still has 9.4.5.26 on it, and I'd like to reinstall a 9.4.5.26 kernel, without wiping my System partition, so I can switch back to Android.

I've (I think) extracted a kernel image and a ramdisk image from a 9.4.5.26 install image, and I'm trying to create a install image containing just the kernel and ramdisk, and copy it to the Staging partition with dd.

I've created a Makefile to create the blobfile, and (seemingly) successfully created the blobfile, but after I do the dd, and reboot, debian/ubuntu boots as usual, instead of some kind of install process.

I've included the Makefile that I'm using below.

Any idea what I'm doing wrong, or what's wrong with my expectations?
Something I have yet to try is an alternative to dd (such as fastboot or nvflash)
Also, maybe I'd have better luck trying to create something that I could install from TWRP.

Code:
Select Code
kern = zImage
bootimg_filename = boot.img
blobpack = ./blobpack
blob_img = blob.LNX
recovery_part = /dev/mmcblk0p4

$(bootimg_filename) : initrd.img $(kern)
        abootimg --create $(bootimg_filename) -k $(kern) -r initrd.img

blob.LNX: $(bootimg_filename)
        $(blobpack) blob.LNX LNX $(bootimg_filename)

install.dd:
        dd if=$(blob_img) of=$(recovery_part)

So you just want to install what you have made to your staging partition, so on next boot the tablet will install it on your tablet is that right??
 
_that
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Quote:
Originally Posted by bsammon View Post
Any idea what I'm doing wrong, or what's wrong with my expectations?
Maybe your blob is missing the signature header. Read my kernel repacking guide here:

http://forum.xda-developers.com/show...80&postcount=4


Why is your extracted kernel separated in zImage and ramdisk? After unpacking the 9.4.5.26 blob, you should get blob.LNX directly without needing to recombine with abootimg.
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bsammon
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Quote:
Originally Posted by _that View Post
Maybe your blob is missing the signature header. Read my kernel repacking guide here:

http://forum.xda-developers.com/show...80&postcount=4
Yes! -- that was it -- after two tries, I got a working Makefile.

Quote:
Originally Posted by _that View Post
Why is your extracted kernel separated in zImage and ramdisk? After unpacking the 9.4.5.26 blob, you should get blob.LNX directly without needing to recombine with abootimg.
Well, doing things the (somewhat) harder way is more educational, and I end up with a makefile that I can reuse for kernels and ramdisks that I make/modify myself.

If anyone's interested, here's the Makefile that I ended up with:
Code:
Select Code
kern = zImage
bootimg_filename = boot.img
blobpack = ./blobpack
unsigned_blob = blob.LNX.in
signature = blob.sign
blob_img = blob.LNX
staging_part = /dev/mmcblk0p4

$(bootimg_filename) : initrd.img $(kern)
        abootimg --create $(bootimg_filename) -k $(kern) -r initrd.img

$(unsigned_blob): $(bootimg_filename)
        $(blobpack) $(unsigned_blob) LNX $(bootimg_filename)

$(signature):
        echo -n "-SIGNED-BY-SIGNBLOB-" > $(signature)
        dd if=/dev/zero bs=1 count=8 >> $(signature)

$(blob_img): $(signature) $(unsigned_blob)
        cat $(signature) $(unsigned_blob) > $(blob_img)

install.dd:
        dd if=$(blob_img) of=$(staging_part)
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