[U-Boot] Tegra board problems

[Stephen Warren]

On 11/25/2014 09:16 AM, Simon Glass wrote:
> Hi Stephen,
>
> On 25 November 2014 at 09:11, Stephen Warren <swarren at wwwdotorg.org> wrote:
>> On 11/24/2014 09:03 PM, Simon Glass wrote:
>>>
>>> Hi,
>>>
>>> I'm a bit messed up with my testing now.
>>
>> ...
>>>
>>> 2. beaver: I cannot get mainline U-Boot to boot a kernel. In fact
>>> 'part list mmc 0' just prints an error:
>>>
>>> ## Unknown partition table
>>>
>>> It is getting a partition ID of 0. Is there something wrong with
>>> Beaver's mmc support in mainline?
>>
>>
>> I just built commit 2a82ec77d27e "Prepare v2015.01-rc2" and both eMMC and SD
>> appear to work.
>>
>> Do you have a valid partition table on the eMMC? If you installed L4T there
>> rather than partitioning it yourself, note that L4T uses a non-standard
>> "tegra PT" partition table format. Some newer versions of L4T also include a
>> backup GPT that makes some of the partitions available in a more standard
>> way, but IIUC there's never a primary GPT. I don't recall if the version of
>> L4T for Beaver was new enough to do even that though. Your best bet is to
>> use standard tools to install a complete GPT and then install a Linux distro
>> on top of that.
>>
>> Tegra30 (Beaver) # part list mmc 0
>>
>> Partition Map for MMC device 0  --   Partition Type: EFI
>>
>> Part    Start LBA       End LBA         Name
>>          Attributes
>>          Type GUID
>>          Partition GUID
>>    1     0x00000800      0x01da97ff      ""
>>          attrs:  0x0000000000000000
>>          type:   ebd0a0a2-b9e5-4433-87c0-68b6b72699c7
>>          guid:   ac3c736e-a29b-43d4-9819-4cf4fd84c3b0
>>
>> Tegra30 (Beaver) # part list mmc 1
>>
>> Partition Map for MMC device 1  --   Partition Type: EFI
>>
>> Part    Start LBA       End LBA         Name
>>          Attributes
>>          Type GUID
>>          Partition GUID
>>    1     0x00000022      0x003b9132      ""
>>          attrs:  0x0000000000000000
>>          type:   ebd0a0a2-b9e5-4433-87c0-68b6b72699c7
>>          guid:   b2f82cda-2535-4779-b467-094a210fbae7
>>
>
> OK thank you, that could be my problem. I'll try installing a new GPT.
>
> Will try out the Jetson and see if I can get it running again. So does
> that mean as shipped it runs an Android boot loader and then jumps to
> U-Boot?

It probably depends on which L4T release you have.

I think the following is accurate:

The first L4T releases for Jetson may have only supported the Android 
boot loader.

A later release certainly supported either the Android boot loader or 
U-Boot. You had to choose which to install at flashing time. The Android 
boot loader is/was the default, and is/was what is installed at the 
factory. In either case, there's no chain-loading of boot loaders, 
simply a choice of which to put into flash.

I believe the latest release only contains U-Boot, or perhaps supports 
both with U-Boot as the default, but I haven't validated that, nor 
whether it's actually shipped yet.