[U-Boot] [PATCH v2] kwboot: boot Marvell Kirkwood SoCs over a serial link

[Daniel Stodden]

On Wed, 2012-05-09 at 08:25 -0500, David Purdy wrote:
> On Wed, May 9, 2012 at 3:00 AM, Daniel Stodden
> <daniel.stodden at googlemail.com> wrote:
> >>
> >>
> >> Have you tried to put the bootrom in the debug mode ?
> >>
> >> https://doukki.net/doku.php?id=wiki:tutoriels:u-boot.uart#boot_from_uart0
> >>
> >> Réfs :
> >> http://www.marvell.com/embedded-processors/kirkwood/assets/FS_88F6180_9x_6281_OpenSource.pdf
> >>
> >> May be it can helps to understand the 1.11 and 1.21 differences ?
> >
> > I never played with it. But according to the documentation, it's rather
> > orthogonal to image upload. You get a command line interface. However, I
> > see no command references in the docs.
> >
> > Might support entering it in kwboot in the future, but I don't see how
> > it's would help with the protocol issues.
> >
> > Daniel
> >
> 
> 
> @ Daniel: Just 2 thoughts...
> 
> 1.   (less important...) I wonder if it is possible to query the
> BootROM version via UART...  if possible, on detecting 111 @ offset
> ff00003c, have it print "Not Supported on V1.11 BootROM"

Unless s/o can point me at documentation for the debug mode, I'm not
sure whether that's going to work smoothly. Sounds more prone to future
breakage, as the device firmware evolves.

Iff people would really like to see that supported, I'd rather suggest
to make it some --test command. Not run ahead of the regular boot mode.
Which then could match against a black/white list of firmware versions
tested.

> 2.  (more importantly) :   I am actually _just_fine__ w/ the level of
> function in your current V2.   You've already done a good service to
> those work on Kirkwood stuff, and would want to press anyone into
> fixing something that they/we didn't break and possibly can't be
> fixed.  [There may well be a reason no one has gotten anything w/ the
> V1.11 BootROM to work with UART-booting.]
> 
> For me, your V2 already feels "mature".  Its a big step forward from
> where we were.

Thanks.

I'll fix the select() glitch mentioned before and send out v3.

Daniel