I've just copied and pasted directly from Clubnook in case people don't want to link over there. If this is useful for you, comment and I'll keep it updated. If not, just let it fall into the ether...
CM7 - SD Card - Mac Version
INSTALLING CM7 (CyanogenMod 7/Android 2.3) ONTO A MICROSD CARD FOR USE WITH NOOK COLOR
Thanks to DrAstro for the following instructions:
I used the instructions from verygreen (who deserves any and all credit):
I did nothing other than follow exactly what he said to do and was up and running with full android market access in about 10 minutes (with a 5 minute nap in the middle!). It was literally that easy. I’ve just expanded, in gory detail, on the basic.
Basically, what you are doing here is taking a microSD card, making it so that the nook color can boot from it, putting a new OS on that card (CM7) and then adding the android market. At the end, you will be able to run a more tablet-like experience from your microSD card without doing anything to the internal software that BN put on there. Here are steps, with heavy borrowing from verygreen’s guide. Hopefully you will read and understand what you are doing, so that you can pick and choose which OS zip you want to use.
NOTE: These are mac specific instructions, as that’s what I used!
1) Downloaded the following files and put them on your desktop:
) - This file makes your SD card bootable. This is probably the “hardest” part of the process as you have to “burn” this image to the card, not just “drag and drop”
) – This is the latest beta version of CM7 that was available at the time I did this! There may be some instability, but they fixed the battery issues with this release so the tradeoff is worth it.
Or get the latest stable version update-cm-7.0.2-encore.zip
) – This was the latest google apps version that was available when I did this. It will give you access to the android market!
2) Get any microSD card that you don't mind trashing the data on. There a LOTS of options out there, but I would HIGHLY SUGGEST getting a SANDISK, CLASS 4, 8 GB or 16 GB card. It is by far the most likely card to work well for you.
Also get a reader for your microSD card. I got one that plugs into my USB port and lets me see my microSD card on my desktop.
3) The first step is to install the .img file to the microSD card. First, you need to double click it on your desktop and let mac osx unzip it for you. It should do this nicely and your resultant file will be:
generic-sdcard-v1.2.1.img (i.e. the .gz at the end will go away)
To install the .img onto the microsd card, put the micro sd card into your card reader. It should pop up on your desktop as a disk. Mine was called “no name”.
To write the image (called burning the .img file to), you need to do the following:
-Find which drive the sd card is mapped to. To do this on mac, you can use the terminal:
how to open the terminal:
a) Go up to the magnifying glass in the top right of your mac.
b) Click on it and search for the word “terminal”. The first thing it finds should be a little black box with the word Terminal.
c) Click on that and a window should open on your desktop. That window should say something like Terminal – bash – 80x24 in the top line and then have a bunch of words, maybe something about Last login: and finally a line that ends in a dollar sign $. Here’s where you will type in your commands.)
Inside of that terminal, after the dollar sign ($) first, type:
That will take you to your desktop. If you now type
This should show you a list of all the files and folders on your desktop. All the terminal does is let you work with files using text commands rather than a nice graphical interface (i.e. clicking on windows and stuff)
Now that you know a couple basics on “terminals” type this:
This lists all the spaces on your computer where things are stored. You need to unmount the microSD card that you just plugged in. This will allow you to erase the card and put what you want on it. You need to look at this list and figure out which drive# is your microSD card. To the far right, you will see the disk size. Your microSD card should be around that same size as what you bought (for example, I’m using an 8GB card and found the disk that was around 7.5 GB).
Once you know the right disk (mine was disk1, yours may be different) unmount that drive by typing this:
diskutil unmountDisk /dev/disk<#>
(to be explicit, my drive was disk1 so I typed: diskutil unmountDisk /dev/disk1)
It should say: Unmount of all volumes on disk<#> was successful
dd if=generic-sdcard-v1.1.img of=/dev/disk1
Everything needed should copy right over to the card. It took my laptop 140 s.
Now unmount the microSD card, but NOT the same way as what you just did. How? Remember when you connected the microSD card and a folder popped up on your desktop? Right click on that and select “unmount”. Note, it might be the case that the folder was renamed “boot”. If that’s the case, that is the folder to unmount.
After the microSD card disappears from your desktop, remove your microSD card from the laptop and plug it back in. The folder named “boot” should pop up on your desktop. Now the easy part.
Drag and drop the file:
update-cm-7.1.0-RCO-encore-2.6.32-beta3.1.zip or update-cm-7.0.2-encore.zip
Into the “boot” folder. Now right click on the “boot” folder and unmount.
Take out the microSD card and put it into the nook color. Turn the nook color on and it will boot. A little penguin might pop up followed by lots of techie looking things flashing on your screen. That’s fine. Keep an eye open and when its done, the screen will go blank. It should turn itself off, but probably won’t reboot. You need to hold down the power button for around 8 seconds to turn it back on. It will reboot into CM7.
(note: This is updated from prior CM7 installations (i.e. these instructions are specific to installing the CM7 beta). If your unhappy with the performance of the beta, you can install a CM7 version that’s labeled as “stable”. The stable versions occasionally need to be turned off manually (i.e. by holding down the power button for 8 seconds)).
You’re almost there. You should have a homescreen with a few icons. Find the one labeled “settings”. Open this up, go to Wireless & networks, and connect to your wireless network. Now CM7 is ready to go online and you can turn off the nook color and install the Android Market.
You need to turn off the nook color. Take out the microSD card and connect it to your computer again. This time, two folders will pop up. One called “boot” and one called “sdcard” or something similar
This time, drag and drop:
into the boot folder. Now comes the second hardest part, booting into recovery. The process depends on the version you are installing.
If you are installing the beta version I reference above then put the microSD card into the nook color and boot into CM7. Once you’re in CM7, hold the power button until a menu pops up and choose to “reboot”. Choose to reboot into “recovery” and you should be all set.
If you’re installing one of the “stable” versions, put the microSD card into the nook color and boot to Recovery Mode. In order to do this hold the nook N key and press and hold the power button for ~5-6 seconds. It may take a couple of tries. The screen may turn off a couple times. You may boot into CM7 a couple times. Eventually, with luck on your side, you will successfully boot into “recovery mode” and google apps will be installed. Once you manage to boot into recovery the screen will flash up lots of techie text, similar to when you started CM7. It should go blank when this is done. At this point you can turn it off by holding power for around 8 seconds. Turn it back on, follow the screen instructions and you should be good to go with an android tablet with the full android market, all running from your microSD card!