[U-Boot] [PATCH v2 16/18] da850_am18xxevm: Add README.da850_am18xxevm

[Tom Rini]

On Wed, Aug 22, 2012 at 10:13:02AM +0200, Christian Riesch wrote:
> [cc'd Manjunath Hadli]
> 
> Hi Tom,
> 
> On Mon, Aug 20, 2012 at 6:45 PM, Tom Rini <trini at ti.com> wrote:
> > Add a board-specific README that documents how to write u-boot.ais to
> > the SPI found on this board.
> >
> > Changes-series: 2
> > - Add
> >
> > Signed-off-by: Tom Rini <trini at ti.com>
> > ---
> >
> >  board/davinci/da8xxevm/README.da850_am18xxevm |   53 +++++++++++++++++++++++++
> >  1 file changed, 53 insertions(+)
> >  create mode 100644 board/davinci/da8xxevm/README.da850_am18xxevm
> >
> > diff --git a/board/davinci/da8xxevm/README.da850_am18xxevm b/board/davinci/da8xxevm/README.da850_am18xxevm
> > new file mode 100644
> > index 0000000..382b718
> > --- /dev/null
> > +++ b/board/davinci/da8xxevm/README.da850_am18xxevm
> > @@ -0,0 +1,53 @@
> > +Summary
> > +=======
> > +The README is for the boot procedure used for the LogicPD AM1808 EVM.
> > +
> > +The board is booted in three stages. The initial bootloader which executes
> > +upon reset is the Rom Boot Loader(RBL) which sits in the internal ROM. The
> > +RBL initialises the memory and the SPI controller and reads the AIS image
> > +starting at block 0.  This image can contain both the SPL and U-Boot
> > +binaries.
> > +
> > +AIS is an image format defined by TI for the images that are to be
> > +loaded to memory by the RBL. The image is divided into a series of
> > +sections and the image's entry point is specified. Each section comes
> > +with meta data like the target address the section is to be copied to
> > +and the size of the section, which is used by the RBL to load the
> > +image. At the end of the image the RBL jumps to the image entry
> > +point.
> > +
> > +The secondary stage bootloader(spl) which is loaded by the RBL then loads
> > +the u-boot from a predefined location in SPI to DDR and jumps to the u-boot
> > +entry point.
> > +
> > +
> > +Compilation
> > +===========
> > +To build a SPI-bootable image, run 'make da850_am18xxevm'.  This will build
> 
> da850_am18xxevm is for the Spectrum Digital EVM for the AM1808. For
> the Logic PD board you will need 'make da850evm'. See [1]

This is funny since the Logic PD board is also called the "AM1808
Evaluation Module" rather than a "Davinci" EVM.  So the README needs a
little more work :)  I'll update and rename.

-- 
Tom