maemo.org - Talk - View Single Post - Introducing ubiboot N9 (multiboot OS loader)

juiceme	2013-11-06 , 15:08
Community Council \| Posts: 4,920 \| Thanked: 12,867 times \| Joined on May 2012 @ Southerrn Finland	#700

Originally Posted by gemfield

Hi, juiceme, I am really intresting in that how ubiboot works:
1, /dev/mtd0 is the bootloader and locked by Nokia, then why it can start the ubiboot kernel? Isn't it can only load official kernel with Nokia signature? Does ubiboot kernel have such signature?
2, what is the difference between /dev/mtd0 bootloader and the Nolo bootloader? If they are different, then which partion that the Nolo bootloader located?

The bootloader starts any kernel that's correctly stored to the kernel partition (which is mtd2, by the way)
The bootup behaves a bit differently, however, depending on if the kernet is signed with Nokia certificate or not.

If the kernel is "Original Nokia-signed kernel", the device unlocks access to the HW-protected trusted-mode registers and functionality, allowing system trusted services to do prectically anything on the device HW.

If the kernel is not signed correctly, the device locks the trusted mode access and there are some things that cannot be done. (for example the writing to mtd0 that you attempted in your code...)

Ubiboot kernel is not signed by Nokia, if it was things would be very different indeed

To use ubiboot, you do not need to mess with MTD, or do any esoteric trics, it is enough just to flash it to the device with the regular flasher.

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