2ndboot

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Revision as of 20:51, 26 August 2010 by XVilka (Talk | contribs)

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Overview

This is bootloader, which can boot custom boot image even droid-family phone has locked bootloader.

It consist from:

  • small kernel module, for creating device for booting/controlling boot
  • small userspace program, which give for module boot image and flags
  • universal bootloader, which can uses many places for booting

It's derived from collaborative work of yakk and dimichxp for creating bootloader for older motorola phones, before their RSA have been cracked.

Now, this project ported to the Milestone hardware and can boot custom kernel fully, except of baseband part.

Here you can find current development sources of 2ndboot: [1]

See published binaries: (build number 1.03) and (build number 2.31).

Here you can fin howto build 2ndboot from sources: Compiling

Also it is necesseary for developing 2ndboot and custom bootloader/kernel to debug over serial port: Debugging

Progress

Latest attempt: Yakk patched 2nd-boot to make it work on the Milestone, but his source code remains partly unpublished at this time. Status: boots another kernel, which Yakk has also patched to get serial output over the USB connector (using custom hardware to connect to it). Currently the booted kernel has some problems with USB and fails to initialize the phone's modem so it crashes. See published code and binaries: here (build number 1.03) and here (build number 2.31). All current development of 2ndboot now going here When GSM is disabled this kexec module is able to boot the system with the recompiled kernel, but it is not really useful as a phone then. WiFi works fine, though. Yakk is now trying to use 2ndboot to start a patched version of mbm, which should be able to initialize the modem and then pass control to a custom Linux kernel. This is still under development, so don't get too excited. We'll keep you posted.