[Q] Why do SD Card bootable ROMs care about EMMC at all?

[aegrotatio]

I have a partially bricked Nook HD that will boot into recovery but any attempt to install ROMs on it will fail do to some sort of faulty EMMC partition arrangement. What is unexpected is that every one of the SD Card bootable custom ROMs fails due to problems with EMMC.

My question is: I understand why EMMC installations fail, but why do the bootable SD Card ROMs fail when the EMMC partitions are botched up? It doesn't make sense to me.

 

[jpisini]

I have a partially bricked Nook HD that will boot into recovery but any attempt to install ROMs on it will fail do to some sort of faulty EMMC partition arrangement. What is unexpected is that every one of the SD Card bootable custom ROMs fails due to problems with EMMC.

My question is: I understand why EMMC installations fail, but why do the bootable SD Card ROMs fail when the EMMC partitions are botched up? It doesn't make sense to me.

Unless specifically built the SDcard version use EMMC for temp and other things. There are versions for bricked devices and they use a trick to make the OS think EMMC is there.

 

[aegrotatio]

Unless specifically built the SDcard version use EMMC for temp and other things. There are versions for bricked devices and they use a trick to make the OS think EMMC is there.

Hey that sounds really cool! I have yet to find one of those builds. Do you know of any? I can tell you that the N2A cards do not work on this Nook.

I'm looking for an image that I can burn onto an SD Card since I can't put a full ROM on the internal memory using the current SD Card builds from the awesome folks on this forum.

Thanks in advance.

 

[jpisini]

Try this one http://forum.xda-developers.com/showpost.php?p=44790925&postcount=67

 

[aegrotatio]

Try this one http://forum.xda-developers.com/showpost.php?p=44790925&postcount=67

Are there any of these that let me install the image from the SD Card instead of using adb push? The SD Card bootable image is around 120 megabytes, but the images are almost 200 megabytes now. I think it might save a step.

Thanks in advance, again!!

 

[jpisini]

Are there any of these that let me install the image from the SD Card instead of using adb push? The SD Card bootable image is around 120 megabytes, but the images are almost 200 megabytes now. I think it might save a step.

Thanks in advance, again!!

If there is I don't know about it.

 

[verygreen]

Are there any of these that let me install the image from the SD Card instead of using adb push? The SD Card bootable image is around 120 megabytes, but the images are almost 200 megabytes now. I think it might save a step.

Thanks in advance, again!!

You can put the image onto the 3rd partition (ext4 type) in /data/media and will be visible on install from /sdcard.
Need to do it after trying to boot from it once in the nook so that all the partitions are created.

 

[mave2]

re:

You can put the image onto the 3rd partition (ext4 type) in /data/media and will be visible on install from /sdcard.
Need to do it after trying to boot from it once in the nook so that all the partitions are created.

I did just that and it worked great. Under the windows I use utility Paragon ExtFS to enter and write in Ext4 partition, the registration is free if anyone need it. I will really like if someone can make kitkat version for our emmcless tablets. Or if can verygreen make sd stock 2.2. work on our emmcless tablets. I have try it the way it is now and it did not work.