Re-partition the EMMC Size on the RK Platform

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Overview

Introduction to the method for modifying the size of EMMC partition on the RK platform.

Revision History

Date	Manual Version	Revision History
07/02/2025	V1.0	Initial Version

Re-partition the EMMC Size on the RK Platform

On the RK platform, the EMMC partitions are divided through the parameter.txt file, which takes effect when creating the update.img.

You can see:

FIRMWARE_VER: 1.0
MACHINE_MODEL: RK3568
MACHINE_ID: 007
MANUFACTURER: RK3568
MAGIC: 0x5041524B
ATAG: 0x00200800
MACHINE: 0xffffffff
CHECK_MASK: 0x80
PWR_HLD: 0,0,A,0,1
TYPE: GPT
CMDLINE: mtdparts=rk29xxnand:0x00002000@0x00004000(uboot),0x00002000@0x00006000(misc),0x00010000@0x00008000(boot),0x00010000@0x00018000(recovery),0x00010000@0x00028000(backup),0x00c00000@0x00038000(rootfs),0x00040000@0x00c38000(oem),-@0x00c78000(userdata:grow)
uuid:rootfs=614e0000-0000-4b53-8000-1d28000054a9

The partition information of 3568linux is as above.

Note:

The format is: partition size + @ + starting address;
When modifying the partition size, you must pay attention. If you modify a certain partition, you need to correspondingly modify the starting address of the next partition, and so on;
The starting address of the next partition is the starting address of the previous partition plus the partition size.

The rootfs partition is the root partition. The value after @ is the starting address, and the value before @ is the partition size. Note that the starting address of the userdate partition is the starting address of the oem partition plus the partition size.

Each partition is 512 bytes.

Uboot e.g:

0x00002000 *512byte = 8192 * 512byte = 4,194,304byte

4,194,304÷1024 = 4096KB

4096÷1024=4MB

So the size set for uboot is 4M.