Re: Observations with AT91SAM9263-EK

[Sam Ravnborg]

On Tue, Jul 04, 2017 at 12:34:58AM +0800, Jean-Christophe PLAGNIOL-VILLARD 
wrote:
> 
> > On 4 Jul 2017, at 12:19 AM, Sam Ravnborg  wrote:
> > 
> > Hi all.
> > 
> > I recently purchased an AT91SAM9263-EK from ebay and
> > have played around a little with barebox.
> > For now only some observations.
> > 
> > I had the impression that I could
> > drop AT91BootStrap when using barebox.
> 
> Yes Wrote the support for that but on the 9263 you are limited.
> 
> you have 2 choice boot a small barebox <= 72kiB
> 
> or use a console less barebox to boot the second barebox
> 
> as the rom code on at91 will load the barebox from the SD or Nand
> into SRAM

Thanks for the info.
I will try to collect this in a at91.rst file in Documentation/boards/
When there is something useful I will post a patch for review.

> > 
> > But I could not make it boot until I deployed 
> > at91bootstrap (named BOOT.BIN) on the SD-card.
> > And I named arch/arm/pbl/zbarebox.bin => u-boot.bin
> > on the SD-card.
> > 
> 
> on 9263ek you have a nor flash so why not flash it
> 
> in this case barebox will boot by itself
> 
> without the bootstrap

The EK only have NAND, the NOR is not mounted.
But anyway - the idea here is to have a testbed for my at91
patches that I can use before I send them upstream.

I have a proprietary at91sam9263 based board that
I will try to add support for in barebox.
But only the parts touching the atmel boards are relevant for the
upstream barebox.

Step 1 was to get barebox workign with the EK, and with
the two small patches I already sent it looks like I
had some luck there.

Sam

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Re: Observations with AT91SAM9263-EK

[Jean-Christophe PLAGNIOL-VILLARD]

> On 4 Jul 2017, at 12:19 AM, Sam Ravnborg  wrote:
> 
> Hi all.
> 
> I recently purchased an AT91SAM9263-EK from ebay and
> have played around a little with barebox.
> For now only some observations.
> 
> I had the impression that I could
> drop AT91BootStrap when using barebox.

Yes Wrote the support for that but on the 9263 you are limited.

you have 2 choice boot a small barebox <= 72kiB

or use a console less barebox to boot the second barebox

as the rom code on at91 will load the barebox from the SD or Nand
into SRAM
> 
> But I could not make it boot until I deployed 
> at91bootstrap (named BOOT.BIN) on the SD-card.
> And I named arch/arm/pbl/zbarebox.bin => u-boot.bin
> on the SD-card.
> 

on 9263ek you have a nor flash so why not flash it

in this case barebox will boot by itself

without the bootstrap

Best Regards,
J. 
> I wanted to boot barebox - but nothing happened.
> So I tried older versions af barebox:
> 
> v2017.06.0 => Boots OK (did not try to load a kernel)
> 
> v2017.07.0 => Boots but emits:
> NULL pointer dereference at address 0x0014
> ### Please RESET the board ###
> (A bit more was written to the serial console)
> 

> master from git => Nothing written to the console at all
> 
> I will as time permits dig deeper into this.
> Seems like we are facing two bugs:
> One that causes the NULL pointer, and another that
> prevents any output.
> 
> As barebox is quick to build and the bug is simple to spot
> I will likely just try to bisect and see where I end up.
> 
>   Sam
> 
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Observations with AT91SAM9263-EK

[Sam Ravnborg]

Hi all.

I recently purchased an AT91SAM9263-EK from ebay and
have played around a little with barebox.
For now only some observations.

I had the impression that I could
drop AT91BootStrap when using barebox.

But I could not make it boot until I deployed 
at91bootstrap (named BOOT.BIN) on the SD-card.
And I named arch/arm/pbl/zbarebox.bin => u-boot.bin
on the SD-card.

I wanted to boot barebox - but nothing happened.
So I tried older versions af barebox:

v2017.06.0 => Boots OK (did not try to load a kernel)

v2017.07.0 => Boots but emits:
NULL pointer dereference at address 0x0014
### Please RESET the board ###
(A bit more was written to the serial console)

master from git => Nothing written to the console at all

I will as time permits dig deeper into this.
Seems like we are facing two bugs:
One that causes the NULL pointer, and another that
prevents any output.

As barebox is quick to build and the bug is simple to spot
I will likely just try to bisect and see where I end up.

Sam

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