[Q] Nook HD, CM 10.1 w/ CWM earlyaccessv4 - How to diagnose mysterious reboot(s)

[redfriar]

Hi All,

I have a Nook HD, recently purchased and then updated to BN 2.0.6 firmware during the BN registration process. I used the sdcard-cwm-early5.img.gz as referenced in Verygreen's post here to create a bootable CWM SD. I then installed the CM 10.1 build posted in thread by Bokbokban here. Finally, I installed latest gapps from goo.im. All seems to be pretty good, excepting that sometimes, seemingly randomly, the device will reboot itself, at which time it bypasses the SD during boot and goes straight for the stock BN rom on the emmc.

Any ideas on how to proceed? I haven't seen a pattern in the reboots yet, so I am not sure what may or may not be causing them. While I'm not exactly a newb with all that is involved with rooting/flashing various android devices (I own 5 of them), I could use some guidance on how to troubleshoot or diagnose problems like this.

 

[leapinlar]

I am confused. You used an HD+ image from verygreen and an HD ROM from bokbokan. How did you make that work? They should not have worked.

But if you really only used HD files, the reboot problem is probably the brand and class of the SD you used. It needs to be SanDisk class 4. We have that problem a lot on the HD+. It is cause by a kernel panic when trying to write to SD.

The solution is to get a better SD or use bokbokan's new Hybrid SD setup that puts /data on internal memory so SD speed does not matter.

Sent from my Nook HD running CM10.1 on Hybrid SD

 

[redfriar]

I am confused. You used an HD+ image from verygreen and an HD ROM from bokbokan. How did you make that work? They should not have worked.

But if you really only used HD files, the reboot problem is probably the brand and class of the SD you used. It needs to be SanDisk class 4. We have that problem a lot on the HD+. It is cause by a kernel panic when trying to write to SD.

The solution is to get a better SD or use bokbokan's new Hybrid SD setup that puts /data on internal memory so SD speed does not matter.

Sent from my Nook HD running CM10.1 on Hybrid SD

Thanks for your prompt reply. To be clearer, I did not use the HD+ image, but I did use the CWM image Verygreen posted, 'sdcard-cwm-early5.img.gz', as that version supported using CWM to read .zip's from /emmc (in other words, those that were downloaded via BN stock browser).

At the risk of sounding like I am second-guessing you, I think it's worth noting that I had no trouble with many things related to writing to the SD card: writing the CWM image, booting into CWM from the SD, writing the CM10.1 image onto the card, booting from the 10.1 rom, etc... So if it is, as you say, the card having write issues and causing a kernel panic, I'm wondering how I can prove that. I will check the kernel logs when I get home.

I'm using a Sandisk 'ultra' class 10 16gb... I get that 'class 10' generally means 'crappy for small random write requests', but I've had good luck with this particular card on other platforms that are sensitive to consistency of write speeds (G2, Nook Color). However, I'll try a class-4 Sandisk per your suggestion.

Follow-up question: I can't seem to find a solid guide that shows how to install to emmc... is that a new frontier for this device? Is it just that nobody has bothered, or is there a problem with original bootloader supporting that?

 

[leapinlar]

Follow-up question: I can't seem to find a solid guide that shows how to install to emmc... is that a new frontier for this device? Is it just that nobody has bothered, or is there a problem with original bootloader supporting that?

The internal bootloader is locked down pretty good. Some day someone will be able to break it, but for now no one has.

Sent from my Nook HD+ running CM10 on Hybrid SD

 

[dbh369]

Btw, I have had really bad results with my San disk CL 10. You may find other cars will work better.

Sent from my Barnes & Noble Nook HD+ using xda app-developers app