From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tom Rini Date: Tue, 28 Aug 2012 07:59:26 -0700 Subject: [U-Boot] [PATCH v5 20/25] da850: Add README.da850 In-Reply-To: References: <1346109527-17182-1-git-send-email-trini@ti.com> <1346109527-17182-21-git-send-email-trini@ti.com> Message-ID: <503CDCCE.8080402@ti.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de On 08/28/2012 12:27 AM, Christian Riesch wrote: > Hi Tom, > one more comment, please see below. > > On Tue, Aug 28, 2012 at 1:18 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 >> --- >> 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 > > I'm not sure if the flash loader for the L137 would work for the L138 > and the AM1808 as well, please use this URL instead: > http://processors.wiki.ti.com/index.php/Serial_Boot_and_Flash_Loading_Utility_for_OMAP-L138 > > Sorry, I didn't notice that in earlier versions... Whoops, fixed, ack added, thanks! -- Tom