[FS#146] wndr 3700v4 and 4300v1 couldn't effectively use 128 nand flash space

[LEDE Bugs]

The following task has a new comment added:

FS#146 - wndr 3700v4 and 4300v1 couldn't effectively use 128 nand flash space
User who did this - Simpy (Cutepally)

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@Matias this is the only way (without compiling the image yourself): add the usb to mount on /overlay with fstab [[https://wiki.openwrt.org/doc/howto/extroot#chaos_calmer|https://wiki.openwrt.org/doc/howto/extroot#chaos_calmer]]

the way to do it by compiling as normal but with this change:
	(source/target/linux/ar71xx/image/legacy.mk)
		-wndr4300_mtdlayout=mtdparts=ar934x-nfc:256k(u-boot)ro,256k(u-boot-env)ro,256k(caldata)ro,512k(pot),2048k(language),512k(config),3072k(traffic_meter),2048k(kernel),23552k(ubi),25600k at 0x6c0000(firmware),256k(caldata_backup),-(reserved)
		+wndr4300_mtdlayout=mtdparts=ar934x-nfc:256k(u-boot)ro,256k(u-boot-env)ro,256k(caldata),512k(pot),2048k(language),512k(config),3072k(traffic_meter),2048k(kernel),120832k(ubi),122880k at 0x6c0000(firmware),256k(caldata_backup),-(reserved)

i run this on my WNDR3700v4 without problems, this is the original patch [[https://dev.openwrt.org/changeset/48276|https://dev.openwrt.org/changeset/48276]] which was reverted later on in the trunk [[https://dev.openwrt.org/changeset/48456|https://dev.openwrt.org/changeset/48456]]
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=146#comment2165