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

From: Prabhakar Lad <prabhakar.lad@ti.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH v2 16/18] da850_am18xxevm: Add README.da850_am18xxevm
Date: Thu, 23 Aug 2012 10:21:14 +0530	[thread overview]
Message-ID: <5035B6C2.6040905@ti.com> (raw)
In-Reply-To: <CABkLObrf_y9rGjRAvMtg7KZtTJaKHYcxUsVBAEAw+th=qeQOcQ@mail.gmail.com>


CC'ed Sekhar

On Wednesday 22 August 2012 08:39 PM, Christian Riesch wrote:
> Hi Prabhakar,
> 
> On Wednesday, August 22, 2012, Prabhakar Lad wrote:
> 
>     Hi Christian,
> 
>     On Wednesday 22 August 2012 02:47 PM, Christian Riesch wrote:
>     > Hi Prabhakar,
>     >
>     > On Wed, Aug 22, 2012 at 11:07 AM, Prabhakar Lad
>     <prabhakar.lad@ti.com <javascript:;>> wrote:
>     >> Hi,
>     >>
>     >> On Wednesday 22 August 2012 01:43 PM, Christian Riesch wrote:
>     >>> [cc'd Manjunath Hadli]
>     >>>
>     >>> Hi Tom,
>     >>>
>     >>> On Mon, Aug 20, 2012 at 6:45 PM, Tom Rini <trini@ti.com
>     <javascript:;>> 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@ti.com <javascript:;>>
>     >>>> ---
>     >>>>
>     >>>>  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]
>     >>>
>     >>   May be having a common README for am18x and omap-l138 would be
>     good ?
>     >>
>     >
>     > This is a good idea.
>     >
>     > But just to make it clear: Afaik the da850evm configuration works for
>     > both the AM1808 and the OMAP-L138 board from LogicPD (at least I am
>     > using it with the AM1808 experimenter's kit from LogicPD). The
>     > da850_am18xxevm is for the Spectrum Digital board. At least this is
>     > what I understood from the discussion with Manjunath Hadli in the in
>     > the u-boot mailing list thread I cited earlier. I hope this is
>     > correct, I haven't got other boards than the AM1808 board from LogicPD
>     > to test.
>     >
>     AFAIK the difference between AM1808 and OMAP-L138 is that,
>     1: The AM1808 has EEPROM and stores the MAC address in it where as
>     OMAP-L138 stores the MAC address in SPI flash.
> 
> 
> Are you sure? I don't see that in datasheets/schematics.
> 
  Can you help here ?

Thx,
--Prabhakar

> Christian
> 
>  
> 
>     2: The revision number differs for both.
> 
>     Thx,
>     --Prabhakar
> 
> 
> 
>  
> 
>     > Regards, Christian
>     >
> 
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