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 ?
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]
-- 1.7.9.5
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