thoughts for next steps...

Ed Sutter ed.sutter at alcatel-lucent.com
Wed Jun 24 14:35:25 UTC 2015


On 6/24/2015 10:35 AM, Jarielle Catbagan wrote:
> On Wed, Jun 24, 2015 at 7:17 AM, Ed Sutter <ed.sutter at alcatel-lucent.com> wrote:
>> On 6/24/2015 10:12 AM, Gedare Bloom wrote:
>>> On Wed, Jun 24, 2015 at 9:37 AM, Ed Sutter <ed.sutter at alcatel-lucent.com>
>>> wrote:
>>>> Jarielle,
>>>> Something to consider...
>>>>
>>>> I think the next two big steps are:
>>>> - Init DRAM
>>>> - Boot standalone (using uSD instead of UART)
>>>>
>>>> I believe your current plan was to work on DDR-init next; however it may
>>>> be
>>>> better (your choice, just adding my 2cents) to consider booting from
>>>> microSD
>>>> as the next task.  Here's why I say that...
>>>>
>>>> As you are playing with DDR-init you'll have to do a lot of restarting
>>>> the
>>>> board.
>>>> Each time you do that, you'll have to reboot using Xmodem.  This requires
>>>> a
>>>> few manual steps: hold boot button while power cycling, then issue
>>>> xmodem...
> If I am understanding you correctly, I actually don't have to power
> cycle the board anytime the board hangs.  I just simply reset via the
> reset button and then issue an xmodem transfer again without touching
> any cables and restarting my terminal emulator.  I hope I did not
> misunderstood you :-)
Yep, either way (power cycle or reset button), its a simpler reboot if 
it occurs without
xmodem.
>
>>>> Alternatively, if you get the boot-from-uSD card stuff working, and then
>>>> erase
>>>> the eMMC (causing the cpu to automatically boot from uSD), you should be
>>>> able to just push the reset button to restart a locked up board.
>>>>
>>> In other words, it has a tighter develop-execute-debug loop.
>> Exactly.
>>>
>>>> It would just be easier (IMHO) if the board could reset with this basic
>>>> uMon
>>>> image
>>>> (what you have running now) by default.  Know what I mean?  If yes, what
>>>> do
>>>> you think?
> I think it's a great idea.  Yesterday I was deciding what I should
> finish first, which was either DDR-init or boot off of an uSD card.
>
> I will definitely start getting the uSD card booting to work as soon
> as possible.
>
> Right now I am at my university (taking summer classes) and I don't
> have access to an uSD card (left it at home).  But I did bring my
> Beaglebone Black with me as well.  So I'll continue working on
> DDR-init, and when I get home I'll immediately start working on
> getting Umon to boot of a uSD card.
>
>>>> Ed
>>>> _______________________________________________
>>>> umon-devel mailing list
>>>> umon-devel at rtems.org
>>>> http://lists.rtems.org/mailman/listinfo/umon-devel
>>
>>
>> --
>> Ed Sutter
>> Alcatel-Lucent Technologies -- Bell Laboratories
>> Phone: 908-582-2351
>> Email: ed.sutter at alcatel-lucent.com
>>
>>
>> _______________________________________________
>> umon-devel mailing list
>> umon-devel at rtems.org
>> http://lists.rtems.org/mailman/listinfo/umon-devel


-- 
Ed Sutter
Alcatel-Lucent Technologies -- Bell Laboratories
Phone: 908-582-2351
Email: ed.sutter at alcatel-lucent.com




More information about the umon-devel mailing list