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 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 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
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