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-Summary
-=======
-The README is for the boot procedure used for TI's OMAP-L138 based
-hawkboard. The hawkboard comes with a 128MiB Nand flash and a 128MiB
-DDR SDRAM along with a host of other controllers.
-
-The hawkboard is booted in three stages. The initial bootloader which
-executes upon reset is the Rom Boot Loader(RBL) which sits in the
-internal ROM of the omap. The RBL initialises the memory and the nand
-controller, and copies the image stored at a predefined location(block
-1) of the nand flash. The image loaded by the RBL to the memory is the
-AIS signed spl image. This, in turns copies the u-boot binary from the
-nand flash to the memory 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 secondary stage bootloader(spl) which is loaded by the RBL then
-loads the u-boot from a predefined location in the nand to the memory
-and jumps to the u-boot entry point.
-
-The reason a secondary stage bootloader is used is because the ECC
-layout expected by the RBL is not the same as that used by
-u-boot/linux. This also implies that for flashing the spl image,we
-need to use the u-boot which uses the ECC layout expected by the
-RBL[1]. Booting u-boot over UART(UART boot) is explained here[2].
-
-
-Compilation
-===========
-Three images might be needed
-
-* spl - This is the secondary bootloader which boots the u-boot
- binary.
-
-* u-boot binary - This is the image flashed to the nand and copied to
- the memory by the spl.
-
- Both the images get compiled with hawkboard_config, with the TOPDIR
- containing the u-boot images, and the spl image under the spl
- directory.
-
- The spl image needs to be processed with the AISGen tool for
- generating the AIS signed image to be flashed. Steps for generating
- the AIS image are explained here[3].
-
-* u-boot for uart boot - This is same as the u-boot binary generated
- above, with the sole difference of the CONFIG_SYS_TEXT_BASE being
- 0xc1080000, as expected by the RBL.
-
- hawkboard_uart_config
-
-
-Flashing the images to Nand
-===========================
-The spl AIS image needs to be flashed to the block 1 of the Nand
-flash, as that is the location the RBL expects the image[4]. For
-flashing the spl, boot over the u-boot specified in [1], and flash the
-image
-
-=> tftpboot 0xc0700000 <nand_spl_ais.bin>
-=> nand erase 0x20000 0x20000
-=> nand write.e 0xc0700000 0x20000 <nand_spl_size>
-
-The u-boot binary is flashed at location 0xe0000(block 6) of the nand
-flash. The spl loader expects the u-boot at this location. For
-flashing the u-boot binary
-
-=> tftpboot 0xc0700000 u-boot.bin
-=> nand erase 0xe0000 0x40000
-=> nand write.e 0xc0700000 0xe0000 <u-boot-size>
-
-
-Links
-=====
-
-[1]
- http://code.google.com/p/hawkboard/downloads/detail?name=u-boot_uart_ais_v1.bin
-
-[2]
- http://elinux.org/Hawkboard#Booting_u-boot_over_UART
-
-[3]
- http://elinux.org/Hawkboard#Signing_u-boot_for_UART_boot
-
-[4]
- http://processors.wiki.ti.com/index.php/RBL_UBL_and_host_program#RBL_booting_from_NAND_and_ECC.2FBad_blocks