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

[Tom Rini]

On Tue, Aug 21, 2012 at 9:46 PM, Prabhakar Lad <prabhakar.lad at ti.com> wrote:
> On Tuesday 21 August 2012 09:04 PM, Tom Rini wrote:
>> On 08/20/2012 10:09 PM, Prabhakar Lad wrote:
>>> Hi Tom,
>>>
>>> Thanks for the patch.
>>>
>>> On Monday 20 August 2012 10:15 PM, Tom Rini 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
>>>> +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
>>>> +
>>>   Is this procedure to be done in Nand boot mode ?
>>
>> This board, as far as I know (which isn't much) doesn't use NAND, just
>> SPI.  The USE_NAND section of da850evm.h doesn't seem reachable today at
>> least.
>>
>   But the title for above says 'Flashing the images to Nand' ? It should
> be SPI.

You are correct, thanks.

-- 
Tom