On Tuesday 28 August 2012 04:48 AM, Tom Rini wrote: > This file documents when to build for da850evm and when to build for > da850_am18xxevm. It also documents how to write the u-boot.ais file to > persistent storage (such as SPI), in some cases as well as how to write > a recovery image. > > Signed-off-by: Tom Rini <tr...@ti.com>
Acked-by: Prabhakar Lad <prabhakar....@ti.com> Regards, --Prabhakar > --- > Changes in v2: > - Add README.da850_am18xxevm > > Changes in v3: > - Fix thinko, Nand -> SPI (spotted by Prabhakar Lad) > - Rename to README.da850, add more direct recovery method (Christian Riesch) > > Changes in v4: > - Further re-word README.da850 based on feedback from Christian Riesch > > board/davinci/da8xxevm/README.da850 | 68 > +++++++++++++++++++++++++++++++++++ > 1 file changed, 68 insertions(+) > create mode 100644 board/davinci/da8xxevm/README.da850 > > diff --git a/board/davinci/da8xxevm/README.da850 > b/board/davinci/da8xxevm/README.da850 > new file mode 100644 > index 0000000..621a95d > --- /dev/null > +++ b/board/davinci/da8xxevm/README.da850 > @@ -0,0 +1,68 @@ > +Summary > +======= > +The README is for the boot procedure used for various DA850 (or compatible > +parts such as the AM1808) based boards. > + > +In the context of U-Boot, the board is booted in three stages. The initial > +bootloader which executes upon reset is the ROM Boot Loader (RBL) and sits > +in the internal ROM. The RBL initializes the internal memory and then > +depending on the exact board and pin configurations will initialize another > +controller (such as SPI or NAND) to continue the boot process by loading > +the secondary program loader (SPL). The SPL will initialize the system > +further (some clocks, SDRAM) and then load the full u-boot from a > +predefined location in persistent storage to DDR and jumps to the u-boot > +entry point. > + > +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 AIS format allows for > +other things such as programming the clocks and SDRAM if the header is > +programmed for it. We do not take advantage of this and instead use SPL as > +it allows for additional flexibility (run-time detect of board revision, > +loading the next image from a different media, etc). > + > + > +Compilation > +=========== > +The exact build target you need will depend on the board you have. For > +Logic PD boards, or other boards which store the ethernet MAC address at > +the end of SPI flash, run 'make da850evm'. For boards which store the > +ethernet MAC address in the i2c EEPROM located at 0x50, run > +'make da850_am18xxevm'. Once this build completes you will have a > +u-boot.ais file that needs to be written to the correct persistent > +storage. > + > + > +Flashing the images to SPI > +========================== > +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 $filesize > + > + > +Recovery > +======== > + > +In the case of a "bricked" board, you need to use the TI tools found > +here[1] to write the u-boot.ais file. An example of recovering to the SPI > +flash of an AM1808 would be: > + > +$ mono sfh_OMAP-L138.exe -targetType AM1808 -p /dev/ttyUSB0 \ > + -flash_noubl /path/to/u-boot.ais > + > +For other target types and flash locations: > + > +$ mono sfh_OMAP-L138.exe -h > + > +Links > +===== > +[1] > + > http://processors.wiki.ti.com/index.php/Serial_Boot_and_Flash_Loading_Utility_for_OMAP-L137 > _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
