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....@ti.com> 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 <tr...@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 <tr...@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 ? >> > > 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. 2: The revision number differs for both.
Thx, --Prabhakar > Regards, Christian > _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
