Astra 开发套件的eMMC分区定制

The main internal storage used for Astra Machina is the eMMC chip located on the Core Module. The eMMC has partitions for firmware, the root fs, and a home partition. These partitions can be resized to allow more data to be stored in a specific partition. The most common use case would be to enlarge the root fs to accommodate more packages being installed on the board.

Partition Size	Partition Name	Erase / Format	First Action	Write Protection
16M@16M	factory_setting	format	default	none
1M	key_a	default	default	none
7M	tzk_a	default	default	none
1M	key_b	default	default	none
7M	tzk_b	default	default	none
16M	bl_a	default	default	none
16M	bl_b	default	default	none
32M	boot_a	default	default	none
32M	boot_b	default	default	none
32M	firmware_a	default	default	none
32M	firmware_b	default	default	none
1408M	rootfs_a	default	default	none
1408M	rootfs_b	default	default	none
16M	fastlogo_a	default	default	none
16M	fastlogo_b	default	default	none
2M	devinfo	erase	default	none
2M	misc	erase	default	none
.	home	default	default	none

The default image layout for SL1620, SL1640, and SL1680. As of v1.2.0, the home partition is resized to the use the remaining space left at the end of the eMMC.

Some partitions have a and b versions. These redundant partitions are used to support system update.

备注

Enlarging an ab partition will require 2x additional space on the eMMC.

调整分区大小

The eMMC partition layout is set in the emmc.pt file included in the synasdk-config-native package. Use the devtool utility to modify the config file:

devtool modify synasdk-config-native

The devtool utility will create the build-sl1680/workspace/sources/synasdk-config-native/configs/product directory which will contain the source for the config package. In the product directory is a subdirectory containing a config file for each of the platforms. Edit the emmc.pt file for the platform which you are building for.

For example, to change the root fs partition size for SL1680, edit sl1680_poky_aarch64_rdk/emmc.pt .

Change made to double the root fs partition on SL1680

增加整个eMMC的大小

The default eMMC image size is 16GB. This is the minimum eMMC size for Astra Machina Core Modules. If you have a device with a larger eMMC and would like to allocate more space to system partitions, then you can enlarge the total eMMC size to accommodate the larger partitions.

The total eMMC size is set in the in the configuration file included in the synasdk-config-native package. Set the CONFIG_EMMC_TOTAL_SIZE parameter to the to the total size of the eMMC on your board.

Setting the total eMMC size to 32GB on SL1680

构建 更新的镜像

Finally, build an image with the modified eMMC partition layout:

devtool build synasdk-config-native
devtool build-image astra-media

In dual display setups, it can be useful to set which display new applications (Weston Clients) should open in. Astra RDK supports specifying which display should be the default. This is done by setting the default display name in a file and setting the SHELL_OVERRIDE_DISPLAY_WINDOW parameter in /etc/default/weston , to the path of that file.

Identify then name of the display by looking at the ‘Connectors’ section using the command:

modetest -M synaptics

Create a file in any location on the board which holds the name of the display. In this example we are using DSI-1 :

echo "DSI-1" > /home/root/def_disp

Set the SHELL_OVERRIDE_DISPLAY_WINDOW parameter in /etc/default/weston :

SHELL_OVERRIDE_DISPLAY_WINDOW=/home/root/def_disp

Restart the Weston service to allow the change to take affect.

systemctl restart weston

New applications will now open in the display named in /home/root/def_disp . To change the default display, simply update this file and restart Weston.