Re: [RFC 2/2] dns325: initial support for D-Link DNS-325

[Alexander Aring <alex.aring@gmail.com>]

Hi,

On Thu, Jun 26, 2014 at 08:53:02AM +0200, Sebastian Hesselbarth wrote:
> On 06/26/2014 06:27 AM, Alexander Aring wrote:
> > On Sun, Jun 22, 2014 at 11:50:56PM +0200, Sebastian Hesselbarth wrote:
> >> On 06/22/2014 10:34 PM, Alexander Aring wrote:
> >>> This patch add a basic support for the D-Link DNS-325.
> >>>
> >>> Currently only booting via uart with kwboot is supported. The barebox
> >>> kwboot utility doesn't work at the moment. Use kwboot utility from u-boot
> >>> instead.
> >>
> >> Why does kwboot does not work? There is an issue with early Kirkwood's
> >> BootROM and UART boot mode. Just try over and over again. I also recall
> >> modifying the timeouts may help.
> >>
> > 
> > I tried to change the timeouts and it works now. I take these timings from
> > u-boot. Is there any reason why these timings differs?
> 
> IIRC, timings differ because barebox kwboot was mainly tested on Armada
> 370 and that low timings break UART boot mode there. I remember some
> discussion about it a while ago. I'll see if I can find the discussion
> and if there are any hints for timeouts that suite both Kirkwood and
> Armada 370/XP.
> 

ok.

> > Datasheet says nothing about any delay while loop for sending bootmsg.
> > 
> > 
> > Here is my diff with the very small change:
> > 
> > diff --git a/scripts/kwboot.c b/scripts/kwboot.c
> > index e068660..bcb5972 100644
> > --- a/scripts/kwboot.c
> > +++ b/scripts/kwboot.c
> > @@ -34,8 +34,8 @@ static unsigned char kwboot_msg_debug[] = {
> >         0xDD, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77
> >  };
> >  
> > -#define KWBOOT_MSG_REQ_DELAY   1000 /* ms */
> > -#define KWBOOT_MSG_RSP_TIMEO   1000 /* ms */
> > +#define KWBOOT_MSG_REQ_DELAY   10 /* ms */
> > +#define KWBOOT_MSG_RSP_TIMEO   50 /* ms */
> >  
> >  /*
> >   * Xmodem Transfers
> > 
> > 
> > 
> > btw.:
> > 
> > Now I see that the internal ROM bootloader could also boot from SATA
> > device - this sounds interesting. I will try that next weekend.
> 
> Boot source is determined by bootstrap pins, i.e. some pull-up/pull-down
> resistors on board. UART boot mode check was added to BootROM in some
> later Kirkwoods and _additionally_ checks for UART boot source.
> 
> You cannot just change the default boot source without soldering.
> 

... and I don't have any schematics. Okay, maybe I will reverse engineer
the hardware layout one day. I know there are some other not soldered
pin headers, maybe I have luck.

Thanks for this information.

- Alex

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