[Nook Color Android Development] verygreen:
Due to popular demand I have created a size-agnostic SDCard CM7 installer.

Also allows to install unmodified CM7 builds on SD card.

Current version: 1.3

Grab the installer image here:

http://crimea.edu/~green/nook/generic-sdcard-v1.3.img.gz

it's a ~9M image that would unpack into ~130M disk image.

Also note - not all SD cards are created equal. Here is a thread of interest is you have not bought one yet: http://xdaforums.com/showthread.php?p=12964262

Short version: buy Sandisk-branded class 4 microSD cards.

Write the image on your SD card. I tested with 2G, 4G and 8G cards and all worked.

Any uSD card of 1G or bigger in size should work if it is recognized by your nook.

Write on Windows by using WinImage and on Linux/MacOS X by using dd (to the entire device, not one of the partitions. The device name should not have any numbers at the end. The command is something like dd if=/somewhere/generic-sdcard.img of=/dev/sdX bs=1024k)

After done with writing, eject and then re-insert the uSD card into your computer.

Download a CM nightly build from here http://download.cyanogenmod.com/?device=encore (It is recommended to choose -87 nightly or later. If you plan to use prior version for initial install, stick with installer 1.2.1 for a different u-boot version)

Or just use your own update-cm-*-KANG-signed.zip file that is produced if you do your own builds.

The image would correctly detect unmodified CM7 builds and would make necessary adjustments to make them work on SD card.

Put the file to the SD card (there is only one partition). Don't change the name of the file.

unmount the uSD card and insert it into the nook.

Boot from this SD card. It'll boot and will update you on progress.

When it's done, it'll power off.

That's it, you now have CM7 on your SD card.

How to install market and gapps:

After you have booted into the CM7 on SD card for the first time and set up wifi access (important!)

Go to http://wiki.cyanogenmod.com/index.php?title=Latest_Version and at the end there is a table with various google apps versions. Get the one suitable for your cyanogen version (CM7 is the latest for now). The file is named gapps-....zip

shutdown your nook and take the SD card out, insert it into your computer.

Copy the gapps-... file to the SD card on the first partition (titled boot) without changing the file name.

Insert the uSD card back into the NOOK and boot into "Recovery mode" (hold nook N key and then press and hold power until the "Loading..." message appears and then disappears with screen going blank. Release power button, then press it again and hold for ~5 seconds, the bootloader "Loading..." message should be on the screen for three seconds or so before you release power button, keep holding N button until screen blanks again. If the screen went off while you were holding the power key, that means you were holding it for too long).

Alternatively if you do not want to fight the timing, boot normally into Android, then from desktop hold power key until a poweroff menu appears, In the poweroff menu choose "reboot", in the next menu choose "recovery" and press "OK". The nook would reboot straight into recovery.

How to update to a new build:

put the new build you want to try on the first partition. (the name must be update-cm-*.zip or cm_encore_full*.zip or just update-*.zip)

Boot from the SDcard in the recovery mode (see above) and the new snapshot would be installed.

The partition layout would be preserved, filesystems are NOT reformatted, so your data should be safe.

Installing other stuff:

Booting in recovery mode would install all files that are named "update-..." and end with .zip The files would then be deleted! Most of the packages should work, but I only tested a subset and not entire syntax of updater script is implemented. Certainly format and delete are not implemented.

OC Kernel installation instructions:

Starting with v1.2.1 there are no special instructions, install normally as described above.

Partition layout for the SD cards depends on size:

Less than 600M - unsupported.

up to 1G cards gets: system of ~300M and data of the rest of space. No FAT partition

2G cards (more than 1G up to 1800M) gets: 300M system, 612M data, rest is FAT sdcard

more than 2G cards gets: 460M system, 975M data, rest is FAT for sdcard.

How to update if you already installed using older version of the installer and don't want to reinstall (understandably):

Get update zip from http://crimea.edu/~green/nook/update-genimage-1.3.zip

Put the zip file as is onto the first partition of your sdcard..

reboot into recovery (triggered by the keys, the reboot into recovery does not work yet).

The new version would be installed and you are done.

You can combine this installation together with updating to .32 kernel in one step. Just put the update-cm file and the update-genimage-1.3.zip to the first partition. Make sure there is still at least 1M of space left!

Changes in 1.3

Install u-boot.bin and MLO loaders if provided.

Fixed a problem that led to overwrite of recovery kernel if a nightly was installed more than once)

(only in full image) updated u-boot to ignore BCB as that was a common source of problems. (that's why this version is not recommended for initial install with older nightlies, those don't provide a more correct u-boot for later operations. It's fine to do the update from older installer release, though)

Changes in 1.2.1

Really fixed dalingrin kernel packages installation

A bit more robust handling of install scripts

Changes in 1.2

Updated to new u-boot from B&N 1.2 update

Ability to obey BCB in eMMC (allows reboot into recovery from CM7)

Hopefully simplified the timing to trigger recovery boots from keyboard

Added support for Dalingrin's kernel update packages

The v1.1 version that is known good to work with 2.6.29 kernel releases is located at http://crimea.edu/~green/nook/generic-sdcard-v1.1.img.gz