[yocto] how to tftp download a newer u-boot into RAM and simply execute it?

[Robert P. J. Day]

On Wed, 6 Jul 2016, Chris Hallinan wrote:

> Hi Robert,
> That's not old, that's ancient in dog^HU-Boot years - LOL!
>
> It's been quite a while since I looked at a PPC U-Boot, but at a
> minimum, you will need to link U-Boot to a RAM'able address.  By
> default, I'm sure the recipe links it for the NOR addresses.  When
> it boots from NOR it immediately relocates itself to a RAM address
> from NOR, if memory serves.  Notice it's crashing right away, on the
> second instruction.

  i came to that conclusion ... i looked at the u-boot.srec file that
was generated and, sure enough:

S00E0000752D626F6F742E73726563C0
S315FE00000042424242424242420606060606060606AC
S315FE00001000000000000000000000000000000000DC
S315FE000020A0A0A0A0A0A0A0A06060606060606060CC
... snip ...

so definitely linked for flashing to beginning of NOR flash at
0xFE000000. so i suspect i could just flash it and reset and it would
work just fine. and never mind, i found the answer i was after:

http://www.denx.de/wiki/view/DULG/CanUBootBeConfiguredSuchThatItCanBeStartedInRAM

i was hoodwinked into thinking it would be easy because i found this
page:

https://blackfin.uclinux.org/doku.php?id=bootloaders:u-boot:tftp_loading_files

of course, that page is for the blackfin, precisely one of the
platforms the denx page says it *can* work for. grrrrrrrrr.

  so, before i commit myself to this, who's the PPC/MPC8315E-RDB
expert on this list who can confirm a stock u-boot should flash to NOR
and just plain run?

rday

-- 

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Robert P. J. Day                                 Ottawa, Ontario, CANADA
                        http://crashcourse.ca

Twitter:                                       http://twitter.com/rpjday
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