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 <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 >> +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. -- Tom _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
