SMP support for ZEDBOARD

[Bernd Walter]

On Tue, Apr 29, 2014 at 11:20:13PM +0200, Bernd Walter wrote:
> On Tue, Apr 29, 2014 at 11:03:34PM +0200, Bernd Walter wrote:
> > On Tue, Apr 29, 2014 at 10:57:41PM +0200, Bernd Walter wrote:
> > > On Tue, Apr 29, 2014 at 01:21:05PM -0700, Thomas Skibo wrote:
> > > > 
> > > > 
> > > > On 4/29/14, 11:34 AM, Bernd Walter wrote:
> > > > >On Tue, Apr 29, 2014 at 09:40:53AM -0700, Thomas Skibo wrote:
> > > > >>
> > > > >>My parallella hasn't shipped but I think I'll get it mid-May.
> > > > >
> > > > >Backer or preorder?
> > > > >I have a rather high 3k backer number.
> > > > 
> > > > Preorder #2081.  Mine is a 7010 and for some reason I think they are 
> > > > going out later than 7020's.
> > > 
> > > Yes - they likely will :-(
> > > They produced 7020 for the backers and I think there are also some
> > > or all for preorders, but I didn't hear anything about 7010 in production
> > > yet.
> > > 
> > > > >>It will probably require tweaking their version of u-boot.  I'm looking
> > > > >>into that.  But the Zedboard image with a few modified boot files should
> > > > >>work.
> > > > >
> > > > >Good to know that you get a parallella as well.
> > > > >I still struggle a lot with all this Linux influence in u-boot.
> > > > >I will never get those Linux thinking...
> > > > >Things had been so much easier without u-boot on RM9200 and Warner
> > > > >did a so clean, nice and understandable bootcode for it.
> > > > >
> > > > 
> > > > I looked at their u-boot code and they don't have the CONFIG_API flag 
> > > > necessary for ubldr to work.
> > > > 
> > > > I also didn't realize that the Parallella must boot FSBL/u-boot from the 
> > > > QSPI flash.  I hate to require reprogramming the QSPI flash and risk 
> > > > bricking the board.
> > > 
> > > Oh - interesting.
> > > I thought it is just booting from SD and assumed we can use what you
> > > did for the Zedboard to begin with.
> > > Wonder why they added a flash chip, when they could have gone without.
> > > Is this a pin strapping configuration, or something, which can be
> > > changed?
> > 
> > Mmm - ok they have an QSPI Micro Flash in their BOM.
> > Currently printing the schematics.
> > 
> > But my Zedboard also has SPI memory - Spansion S25FL256S.
> > Don't know how it is used - didn't care about until now.
> 
> Did I get it right, that the ROMcode loades the FSBL from either JTAG
> or flash.
> The FSBL then could load u-boot from whatever it supports, but on
> the parallella they load u-boot from QSPI, so it has to be updated?
> I do have a JTAG available, according to the parallella schematics
> however it is setup via solder pull-up vs pull-down resistor.
> I also have a hot air soldering station, but still not nice.
> I also would have to lock up where the JTAG is - probably on one of the
> Samtec connectors :-(

Ok - JTAG is on the SAMTEC.
Bootmode as well - the resistor mode pin was cascaded JTAG vs dedicated.
No soldering, but needs some kind of breakout board.
I remember having seen 0.1" breakout somewhere already, not sure if
it's possible to get one of them.
A JTAG defintively should be reachable in case it's bricked.

-- 
B.Walter <bernd at bwct.de> http://www.bwct.de
Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.