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

[LEDE Bugs]

A new Flyspray task has been opened.  Details are below. 

User who did this - Github Issues (github-import) 

Attached to Project - LEDE Project
Summary - wndr 3700v4 and 4300v1 couldn't effectively use 128 nand flash space
Task Type - Feature Request
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Low
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - Github issue #265 reported by: https://github.com/Cutepally


see https://dev.openwrt.org/ticket/22320
otherwise lede working fine on wndr3700v4
all ive noticed is /overlay isn't that big

Hostname lede
Model NETGEAR WNDR3700v4
Firmware Version LEDE Reboot r1309 / LuCI Master (git-16.217.35130-6a11f71)
Kernel Version 4.4.15

this was brought up on an arokh build on OpenWRT but i think he used a patch for it
see https://forum.openwrt.org/viewtopic.php?pid=310362#p310362
and https://forum.openwrt.org/viewtopic.php?pid=310473#p310473
finally https://forum.openwrt.org/viewtopic.php?pid=311402#p311402

the netgear wndr 3700v4 have 128 nand flash space，the current Flash Layout， use OEM’s firmware MTD partition as Openwrt firmware mtd partition， but the MTD partition only have 25MiB, and
at tail of the nand flash there have a 96MiB reserved MTD partition, the are also a reserved MTD partition in Openwrt.
Whether it is possible use the reserved MTD partition as openwrt firmware MTD partition。
Or the are no way boot from an differ MTD partiton， IF not hack the bootloader；
root at lede:~# df -h
Filesystem                Size      Used Available Use% Mounted on
/dev/root                 2.3M      2.3M         0 100% /rom
tmpfs                    61.0M      1.5M     59.5M   2% /tmp
/dev/ubi0_1              14.2M      9.7M      3.7M  72% /overlay
overlayfs:/overlay       14.2M      9.7M      3.7M  72% /
tmpfs                   512.0K         0    512.0K   0% /dev

root at lede:~# fdisk -l
Disk /dev/mtdblock0: 256 KiB, 262144 bytes, 512 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

Disk /dev/mtdblock1: 256 KiB, 262144 bytes, 512 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

Disk /dev/mtdblock2: 256 KiB, 262144 bytes, 512 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

Disk /dev/mtdblock3: 512 KiB, 524288 bytes, 1024 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

Disk /dev/mtdblock4: 2 MiB, 2097152 bytes, 4096 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

Disk /dev/mtdblock5: 512 KiB, 524288 bytes, 1024 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

Disk /dev/mtdblock6: 3 MiB, 3145728 bytes, 6144 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

Disk /dev/mtdblock7: 2 MiB, 2097152 bytes, 4096 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

Disk /dev/mtdblock8: 23 MiB, 24117248 bytes, 47104 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

Disk /dev/mtdblock9: 25 MiB, 26214400 bytes, 51200 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

Disk /dev/mtdblock10: 256 KiB, 262144 bytes, 512 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

Disk /dev/mtdblock11: 96 MiB, 100663296 bytes, 196608 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

Disk /dev/ubiblock0_0: 2.1 MiB, 2158592 bytes, 4216 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


More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=146