[Automated-testing] minnowboard boot & control

[Otavio Salvador]

On Tue, Feb 4, 2014 at 8:04 PM, William Mills <wmills at ti.com> wrote:
>
> On 02/04/2014 04:51 PM, Otavio Salvador wrote:
>>
>> Hello,
>>
>> On Tue, Feb 4, 2014 at 7:45 PM, William Mills <wmills at ti.com> wrote:
>> ...
>>>
>>> On BeagleBone Black:
>>> The Si Boot ROM can boot from TFTP.
>>> The Si Boot ROM can boot from eMMC or SD.
>>> With relay controlled pull-ups/downs I can control the boot device.
>>>
>>> With this control I can recover a device regardless of what a previous
>>> test
>>> has done to eMMC or SD Card.
>>> (My work is documented at:
>>> http://processors.wiki.ti.com/index.php/BeagleBone_in_a_Board_Farm
>>> )
>>
>>
>> Except U-Boot tests or am I wrong?
>>
>
> I think your asking if I can test experimental (broken) u-boots and
> still recover.
>
> Yes, with this setup I can.
> With the relays, I set the boot mode to TFTP at the ROM level.
> The full boot sequence is:
> ROM -> TFTP SPL -> TFTP Uboot -> whatever U-boot decides
>
> With an unpatched u-boot you can use the serial console to interrupt
> and get control of u-boot and then have it boot whatever you want.
>
> (Back in July I had u-boot hacks to make it get uEnv.txt from TFTP also and
> then the files on the TFTP were in complete control.
> Resurrecting that work and cleaning it up is on my TODO list :)

But will the SPL be also run from the TFTP? Otherwise you're changing
'part' of it.

-- 
Otavio Salvador                             O.S. Systems
http://www.ossystems.com.br        http://code.ossystems.com.br
Mobile: +55 (53) 9981-7854            Mobile: +1 (347) 903-9750