I've been able to get the cool-er ebook reader firmware to run off an sd card on the Kobo device with some minor modifications to the rcS script and using the "hold down center button while using a pin to do a reset" procedure. After testing and observation its apparent that the latest cool-er firmware and the latest Kobo firmware were created with the same development kit. Same, kernel, same libraries etc. It should be possible to run the cool-er firmware filesystem on the Kobo while keeping the kobo kernel and uboot binaries. The cool-er firmware has some obvious benefits including: the ability to disable auto sleep/shutdown, you can go to a specific page in a book, bookmarks, if you shutdown in a book it comes back to that page when you start up again, more formats supported, etc. If anyone is interested I can give more detailed instructions. Running a filesystem from the sd card is a good way to test without actually flashing a new firmware to the device. It should be obvious that the mp3 player functions on the cool-er don't work on the Kobo and you shouldn't remove the sd card when your running your root filesystem from it. Also, you want to be aware that any DRM on files will probably fail as it becomes a new device. If further testing goes well I many try a full install of the cool-er firmware on the Kobo.
From observation, it should be theoretically possible to create a start up hook in the Kobo that runs the cool-er application from a properly constructed sd card and runs the Kobo application when a normal sd card is used or no card is inserted.
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