Rockchip Parameter File
Introduction to the parameter file
The firmware partition information, which is crucial, can be found in the parameter.txt file.
Within the device/rockchip/rk3399 directory, you can locate several parameter.txt files.
To illustrate, here is an example of the contents of a parameter.txt file.
FIRMWARE_VER: 8.1
MACHINE_MODEL: RK3399
MACHINE_ID: 007
MANUFACTURER: RK3399
MAGIC: 0x5041524B
ATAG: 0x00200800
MACHINE: 3399
CHECK_MASK: 0x80
PWR_HLD: 0,0,A,0,1
TYPE: GPT
CMDLINE: mtdparts=rk29xxnand:0x00002000@0x00004000(uboot),0x00002000@0x00006000(trust),0x00002000@0x00008000(misc),0x00020000@0x0000a000(boot:bootable),0x00010000@0x0002a000(recovery),0x00010000@0x0003a000(backup),0x00080000@0x0004a000(userdata),-@0x000ca000(rootfs:grow)
uuid:rootfs=614e0000-0000-4b53-8000-1d28000054a9
The CMDLINE property is of particular importance. Taking uboot as an example, in the format 0x00002000@0x00004000(uboot),
the starting position of the uboot partition is 0x00004000, and the size of the partition is 0x00002000.
The same partition rules apply to other partitions as well. Users have the flexibility to add, remove, or modify partition information according to their requirements. However, it is essential to maintain at least the uboot, trust, boot, and rootfs partitions, as they are necessary for the proper functioning of the device.
The parameter-ubuntu.txt file follows a simple partition scheme.
Brief introduction to each partition
uboot
This partition is used to upgrade the uboot.img compiled by uboot.
trust
This partition is used to upgrade the trust.img compiled by uboot.
misc
This partition is used to upgrade the misc.img and facilitates entering recovery mode (details omitted).
boot
This partition is used to upgrade the boot.img compiled by the kernel and contains kernel and device tree information.
recovery
This partition is used to upgrade the recovery.img (details omitted).
backup
This partition is currently reserved and not in use. It may be used in the future as a backup for recovery, similar to Android (details omitted).
rootfs
This partition stores the rootfs.img compiled by Buildroot, Debian or Ubuntu rootfs and is read-only.
userdata
This partition is used to store files generated by the app or for end-users.
It is read and write accessible and mounted at /userdata (details omitted).