Replicant

h1. GalaxyTab2Bootloader

h2. Galaxy Nexus (I9250)

To get the bootrom to try to boot on USB, you need to do the following:

* Connect the USB cable to the device but make sure it's not connected on the computer.

* Power off the device

* Connect the USB cable

<pre>

# omap-usb-boot -w -v load u-boot.img 

Finding and opening USB device

Found and opened omap4 USB device: OMAP4440

ASIC device id: 4440, HS device

Loading and executing u-boot.img...

Loading data with length 369176 bytes

Bulk USB transfer failed

Loading and executing failed

</pre>

h2. Galaxy Tab 2 7" GSM

To get the bootrom to try to boot on USB, you need to do the following:

* Connect the USB cable to the device but make sure it's not connected on the computer.

* Power off the device

* Connect the USB cable

If we do that, we get the following in the kernel log of your laptop:

<pre>

usb 1-1: new high-speed USB device number 6 using ehci-pci

usb 1-1: unable to get BOS descriptor or descriptor too short

usb 1-1: New USB device found, idVendor=0451, idProduct=d00f, bcdDevice= 0.00

usb 1-1: New USB device strings: Mfr=33, Product=37, SerialNumber=0

usb 1-1: Product: OMAP4430

usb 1-1: Manufacturer: Texas Instruments

usb 1-1: USB disconnect, device number 6

</pre>

We can also try to get a bit more infos with omap-usb-boot:

<pre>

omap-usb-boot -w -v load u-boot.img 

Finding and opening USB device

Found and opened omap4 USB device: OMAP4430

ASIC device id: 4430, HS device

Loading and executing u-boot.img...

Loading data with length 369176 bytes

Bulk USB transfer failed

Loading and executing failed

</pre>

Here we know the device is signed because it's a "HS device".

If it was not signed it would print "GP device" instead.

h2. TODO

There might be some pointers and interesting infos in the following link: https://www.lukastomek.info/2018/11/05/UnBrick-Samsung-Galaxy-Tab/

That link also points to an "u-boot port for the P5100":https://gogs.lukastomek.info/lukas/u-boot.

TODO:

* Read the first link and see what's interesting in it and add it on the wiki.

* Look at how the u-boot port for the P5100 is supposed to run. Is the Xloader signed?