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diff --git a/tools/uflash/README b/tools/uflash/README new file mode 100644 index 0000000000..8e9c22ca81 --- /dev/null +++ b/tools/uflash/README @@ -0,0 +1,125 @@ +This is a Linux command line tool specific to TI's Davinci platforms, for +flashing UBL (User Boot Loader), u-boot and u-boot Environment in the MMC/SD +card. This MMC/SD card can be used for booting Davinci platforms that supports +MMC/SD boot option. + +For simplicity, MMC is used in the following section to represent both MMC and +SD cards. + + +Building uflash utility +======================= +Set the TOOLSUBDIRS macro in the tools/Makefile to contain uflash directory +TOOLSUBDIRS = uflash + +While building the u-boot binary, the uflash utility is also built and is placed +under tools/uflash directory. + + +Creating a Davinci bootable MMC card +===================================== +This document is based on the assumption that UBL is used the primary boot +loader for booting u-boot. For more information on Davinci Boot modes, please +refer the TMS320DM644x DMSoC ARM Subsystem Reference Guide (SPRUE14A). + +The embedded ROM boot loader (RBL) in Davinci expects the bootable code +descriptor to be present in sectors 1 to 25 of the MMC card. Sector 0 is used +for storing DOS partition information. Hence the UBL descriptor is stored +from sectors 1 till 24. The descriptor is 512 bytes in size and is replicated +in each of these sectors. This is followed by the u-boot descriptor, +environment space, UBL binary and u-boot binary as depicted below: + + _______________________________________ + | | + | Sector 0 - Partition Table | + |---------------------------------------| + | Sector 1 - UBL descriptor | + |---------------------------------------| + | Sector 2 - UBL descriptor | + |---------------------------------------| + | .... | + |---------------------------------------| + | Sector 24 - UBL descriptor | + |---------------------------------------| + | Sector 25 - u-boot descriptor | + |---------------------------------------| + | Sector 26 - u-boot descriptor | + |---------------------------------------| + | ... | + |---------------------------------------| + | Sector 51 - u-boot descriptor | + |---------------------------------------| + | Sectors 52 to 83 - u-boot environment | + |---------------------------------------| + | Sectors 84 till 116 - empty | + |---------------------------------------| + | Sector 117 - UBL binary | + |---------------------------------------| + | ... | + |---------------------------------------| + | Sector X = u-boot binary | + | X = 117 + UBL binary size in blocks | + |---------------------------------------| + | ... | + |---------------------------------------| + | Sector Y = Application use | + | Y = X + u-boot binary size in blocks | + |---------------------------------------| + | ... | + |_______________________________________| + +a. The MMC card shall be re-partitioned and formated to create some room for + storing UBL and u-boot. Use fdisk utility (as super user) to delete the + existing partition and create a new one. + # fdisk /dev/mmcblk0 (device name might change if USB card reader is used) + - Delete the existing partitions with 'd' command. + - Create a new partition with 'n' command, followed by 'p' command + - Mark the first cylinder as 20. Typical cylinder size is 32KBytes. So + starting the first cylinder at 20 provides us about 600Kbytes for + storing UBL and u-boot. If the fdisk utility displays a different + cylinder size, make sure that you are leaving atleast 500K space + before the first cylinder. + - Leave the last cylinder to default value (or) any other value + depending on the partition size requirements. + - Save and exit with 'w' command + +b. Format the partition for EXT3 file system + # mkfs.ext3 /dev/mmcblk0p1 + +c. Copy the root file system and kernel uImage onto the newly formated + partition. Pre-built images for Davinci DM355EVM platform are available at: + http://arago-project.org/files/releases/davinci-psp_3.x.0.0/images/dm355-evm/arago-demo-image-dm355-evm.tar.gz (and) + http://arago-project.org/files/releases/davinci-psp_3.x.0.0/images/dm355-evm/uImage-dm355-evm.bin + # mount /dev/mmcblk0p1 /mnt + # cd /mnt + # tar xzf /path_to_binaries/arago-demo-image-dm355-evm.tar.gz + # cp /path_to_binaries/uImage-dm355-evm.bin boot/uImage + # cd /home + # umount /mnt + +d. Modify the config.txt file to set environment variables for u-boot. These + environment variables will be used by default by the u-boot. + +e. Using the 'uflash' utility, place the UBL and u-uoot binaries on the MMC + card. Copy the u-boot.bin to tools/uflash directory + # ./uflash -d /dev/mmcblk0 -u UBL.bin -b u-boot.bin -vv + UBL Size 20991 + u-boot Size 252087 + First partition starts at 1216(622592) + Required Blocks 660, Available Blocks 1215 + UBL Magic Number : a1aced00 + UBL Entry Point : 00000100 + UBL Number of Blocks : 00000028 + UBL Starting Block : 00000075 + UBL Load Address : 00000000 + Writing UBL Signature + Writing UBL + U-Boot Magic Number : a1aced66 + U-Boot Entry Point : 81080000 + U-Boot Number of Blocks : 000001ec + U-Boot Starting Block : 000000a7 + Load U-Boot Address : 81080000 + Writing U-Boot Signature + Writing U-Boot + Done... + |