This document provides a comprehensive overview of the partitions of all boot devices on SP7350 platform. The SP7350 platform supports 5 boot devices, including SPI-NOR flash, SPI-NAND flash, 8-bit NAND flash, eMMC device, and SD card.
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Partition | Size (kB) | Descriptions |
|---|---|---|
iboot | 96 | image of i-boot for external boot |
xboot | 192 | image of x-boot, including training firmware of DDR |
dtb | 128 | image of device-tree blob (not used) |
uboot | 768 | image of U-Boot |
fip | 864 | image of fip, including TF-A and OP-TEE |
kernel | Actual size of image | image of Linux kernel with U-Boot header |
rootfs | Depend on size of flash | image of jfffs2 root file-system |
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Partition | Size | Descriptions |
|---|---|---|
nand_header | 1 block | header of the NAND flash |
xboot1 | Actual size of image | image of x-boot, including training firmware of DDR |
uboot1 | Actual size of image | image of U-Boot (factory default) |
uboot2 | Actual size of image | image of U-Boot (the latest update) |
fip | 2 MB | image of fip, including TF-A and OP-TEE |
env | 512 kB | image of environment variable of U-Boot |
env_redund | 512 kB | image of environment variable of U-Boot (redundant) |
dtb | 256 kB | image of device-tree blob (not used) |
kernel | 25 MB | image of Linux kernel with U-Boot header |
rootfs (ubifs) | Depend on size of flash | image of ubifs root file-system |
It is essential to ensure that the combined size of the nand_header, xboot1, uboot1, and uboot2 partitions does not exceed 4 MB. This constraint is crucial as the fip partition initiates at a 4 MB offset.
Note
To adjust partitions, please modify the define MTDPARTS_DEFAULT in the file:
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Partition | Size | Descriptions |
|---|---|---|
GPT | 17 kB | GUID partition table, including MBR, header and 128 partition table |
uboot1 | 1 MB | image of U-Boot (factory default) |
uboot2 | 1 MB | image of U-Boot (the latest update) |
fip | 1 MB | image of fip, including TF-A and OP-TEE |
env | 512 kB | image of environment variable of U-Boot |
env_redund | 512 kB | image of environment variable of U-Boot (redundant) |
dtb | 256 kB | image of device-tree blob (not used) |
kernel | 32 MB | image of Linux kernel with U-Boot header |
rootfs (ext4) | Depend on size of device | image of ubifs root file-system |
SD card
The SP7350 platform offers support for booting from an SD card, providing a convenient solution for updating system images, particularly during the developmental stage or debugging. Although the SD card
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Partitions
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Files in boot partition
may exhibit lower performance compared to the eMMC device, its utility in certain scenarios remains valuable.
Partitioning
The SD card is divided into two essential partitions: the Boot (boot) partition and the root file-system (rootfs) partition, as shown in figure below:
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Boot (boot) partition
Size of Boot partition is 256 MB. It contains essential files crucial for system booting. Boot partition should be formatted to DOS/Windows FAT32 or FAT16 file-system and is required to be the first partition on the SD card. Refer to table below for files in root directory in boot partition:
File name | Descriptions |
|---|---|
ISPBOOOT.BIN | image of x-boot image |
fip.img | fip image which includes TF-A and OP-TEE images |
u-boot.img | image of U-Boot image |
uEnv.txt | uenvcmd command of U-Boot |
uImage | image of Linux kernel image ( with U-Boot header |
Root file-system (rootfs) partition
The Root file-system (rootfs) partition houses the Linux ext4-formatted root file-system. The size of the rootfs partition for a newly built SD card is close to the actual size of the initial root file-system. Users are advised to extend the partition to the end of the SD card using tools such as fdisk. Following the extension of the partition, the file system should be extended using tools like resize2fs. Alternatively, users can employ integrated tools such as parted or gparted to extend both the partition and file-system simultaneously.