1.1.3. Formatting SD card on Linux¶
The Linux SDK includes a script in the <SDK INSTALL DIR>/bin directory named mksdboot.sh. The purpose of this script is to create bootable SD cards by partitioning and formatting them so that target can boot using the boot images and filesystem.
You will need a >8GB SD Card and a SD Card Reader
If you are having trouble booting with the SD card, you may need to run the following commands to clear the default environment. You will then need to reboot the board for the commands to take effect.env default –a –f saveenv
22.214.171.124. Select the SD Card Device¶
The first step before running the script is to select the drive representing the SD card that you want to format. In most cases your host root file system drive has been masked off to prevent damage to the host system. You can run sudo fdisk -l to find out the device name for the SD card you want to format. Example output looks like this:
Disk /dev/sda: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disklabel type: dos Disk identifier: 0x2addf736 Device Boot Start End Sectors Size Id Type /dev/sda1 2048 614402047 614400000 293G 83 Linux /dev/sda2 614402048 1228802047 614400000 293G 83 Linux /dev/sda3 1228802048 1953523711 724721664 345.6G 83 Linux Disk /dev/sdd: 14.9 GiB, 15931539456 bytes, 31116288 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disklabel type: dos Disk identifier: 0xda7cb208 Device Boot Start End Sectors Size Id Type /dev/sdd1 * 2048 129023 126976 62M c W95 FAT32 (LBA) /dev/sdd2 129024 8517631 8388608 4G 83 Linux /dev/sdd3 8517632 31116287 22598656 10.8G 83 Linux
You should choose the device where the partition sizes match with the SD card you want to partition.
126.96.36.199. Partitioning SD card¶
No matter which use case above that you are creating an SD card for the following steps are the same.
By default Ubuntu uses “dash” as the default shell for /bin/sh. You must reconfigure to use bash by running the following command:
sudo dpkg-reconfigure dash
Be sure to select “No” when you are asked to use dash as the default system shell.
The mksdboot.sh script can be run from any location but must be run with root permissions. This usually means using the sudo command to start execution of the script. For example:
sudo <SDK INSTALL DIR>/bin/mksdboot.sh --device /dev/sdX --sdk <SDK INSTALL DIR> #Replace the /dev/sdX with appropriate device name
For instance, if the SDK was installed at the path /home/user/ti-processor-sdk-linux, the command to run would be below:
sudo /home/user/ti-processor-sdk-linux/bin/mksdboot.sh --device /dev/sdX --sdk /home/user/ti-processor-sdk-linux
By default, the mksdboot.sh copies the PG2.0 sysfw to the SD card. To use the PG1.0 sysfw, the mksdboot script can be run by using an additional argument as shown below.
sudo <SDK INSTALL DIR>/bin/mksdboot.sh --device /dev/sdX --sdk <SDK INSTALL DIR> --pg 1 #Replace the /dev/sdX with appropriate device name
Alternatively, the sysfw can be manually copied by copying the board-support/prebuilt-images/sysfw-am65x-evm.itb file to /media/$USER/boot/sysfw.itb.
If you fail to execute the script without root permissions you will receive a message that root permissions are required and the script will exit.
If you pass incorrect arguments, the SD card partitions may not be detected when connected to your host PC. This can be fixed by using the fdisk utility.
188.8.131.52.1. Tiny Image¶
In case users want to start with a smaller filesystem than what is provided in the tisdk-default-image, the tisdk-tiny-image is provided as a reference of a minimal filesystem.
To install the tisdk-tiny-image, the mksdboot.sh script can be modified to point to this image included in the SDK. Please modify the line below:
Please modify this line to be the following, replacing <platform> with the machine name:
The tisdk-tiny-image is not a bootable image. In order to boot using the tisdk-tiny-image, the linux kernel image, dtb and modules will need to be installed. This can be installed by either copying over these files from the tisdk-default-image or by building and installing these files as described in Simplified SDK Build using Top-Level Makefile.