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root@OpenWrt:~# fdisk /dev/mmcblk0
 
Welcome to fdisk (util-linux 2.32).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
 
Command (m for help): p
Disk /dev/mmcblk0: 7.3 GiB, 7818182656 bytes, 15269888 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: 0x15344058
 
Device         Boot Start    End Sectors   Size Id Type
/dev/mmcblk0p1 *     2048  35327   33280  16.3M  c W95 FAT32 (LBA)
/dev/mmcblk0p2      36864 561663  524800 256.3M 83 Linux


Note
titleIf fdisk is not preset

root@OpenWrt:~# opkg update

root@OpenWrt:~# opkg install fdisk


Create a new partition partitions for RDK-B.

The devicetree database and the Linux kernel are in the FAT32 partition:

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Follow instruction from wiki page(https://wiki.rdkcentral.com/display/RDK/Wifi-Extender+Yocto+Build+Instructions) to make yocto's RDK-B image from yocto workspace in your PC.

Boot into openwrt based linux system in turris omnia board. Its downlink interface will have 192.168.1.1 IP address and have it connected to your PC.
Check whether 'fdisk' command is available in openwrt system. if it is not present, follow below steps to have 'fdisk' command.

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Create one primary partition for zImage. Create another extended partition for holding logical partitions for rootfs and /nvram.

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