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

[Prabhakar Lad]

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 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]
> 
  May be having a common README for am18x and omap-l138 would be good ?

Thx,
--Prabhakar

> Regards, Christian
> 
> 
> [1] http://lists.denx.de/pipermail/u-boot/2012-February/117082.html
> 
>> +the u-boot.ais file that needs to be written to SPI flash.
>> +
>> +
>> +Flashing the images to Nand
>> +===========================
>> +The AIS image can be written to SPI flash using the following commands.
>> +Assuming that the network is configured and enabled and the u-boot.ais file
>> +is tftp'able.
>> +
>> +U-Boot > sf probe 0
>> +U-Boot > sf erase 0 +320000
>> +U-Boot > tftp u-boot.ais
>> +U-Boot > sf write c0700000 0 $filesize
>> +
>> +
>> +Recovery
>> +========
>> +
>> +In the case of a "bricked" board, you need to use the TI tools found
>> +here[1] to write a UBL file and u-boot.bin.  Once the system is running
>> +again from these tools a good u-boot.ais may be re-written to SPI flash.
>> +
>> +
>> +Links
>> +=====
>> +[1]
>> + http://processors.wiki.ti.com/index.php/Serial_Boot_and_Flash_Loading_Utility_for_OMAP-L137
>> --
>> 1.7.9.5
>>
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