[U-Boot] Use u-boot to recover bricked NVIDIA SHIELD TV.

[Aaron Kling]

For reference, that last link is for the shield portable, not the tablet.
But yes, it requires a working bootloader of some form, not really helpful
here. I've always just stuck with the default fastboot, never been brave
enough to try to get u-boot working due to an almost certain perma-brick
chance. We've never got mainline Linux booting on the tablet due to lack of
a proper dtb. There was a very basic one made by gnurou for like 3.17, but
a change to the framebuffer stack nullified that and I haven't been able to
rebuild a proper one for the new format.

On Jun 19, 2017 10:53, "Stephen Warren" <swarren at wwwdotorg.org> wrote:

> On 06/18/2017 04:46 PM, Matthew Gorski wrote:
>
>> I am curious if there is a possibility to recover a wrongly flashed
>> NVIDIA SHIELD TV device by flashing u-boot instead of cboot and mounting
>> the emmc in uboot to do some repairs.
>>
>
> The NVIDIA SHIELD TV is a production Android device, and hence I'm pretty
> sure it has boot security enabled. This security also applies to the USB
> recovery mode protocol, so I don't believe you'll be able to communicate
> with the device unless you know the system's keys, which I assume you don't.
>
> There is some support for flashing generic upstream Linux onto the NVIDIA
> SHIELD tablet, but I believe that relies on  making (at least some of) the
> modifications from a running system, so if your system isn't booting, I
> don't expect this will work either. Just in case it's useful, see:
>
> https://github.com/linux-shield
>