Open-WRT は 主にブロードバンドルーター向けの Linuxディストリビューション。
コミュニティの情報によればNETGEAR の NAS box ReadyNAS Duo v2 にもインストールできる。
ReadyNAS Duo v2は、製造から10年近く経過しており、すでに公式サポートも終了。
中のOSも相当古くなっているので、Open-WRTに入れ替えることで延命を図る。

https://firmware-selector.openwrt.org/?version=SNAPSHOT&target=kirkwood%2Fgeneric&id=netgear_readynas-duo-v2

上のリンクからKERNELとSYSUPGRADEをダウンロードする。

KERNEL：openwrt-kirkwood-netgear_readynas-duo-v2-initramfs-uImage
SYSUPGRADE：openwrt-kirkwood-netgear_readynas-duo-v2-squashfs-sysupgrade.bin

KERNEL　必要最小限の内容だけのイメージ
SYSUPGRADE　KERNELで起動した上で、sysupgrade して使うフル版のイメージ

• ReadyNASとPCをシリアル接続できるようにしておく
• FAT32でフォーマットしたUSBメモリに KERNELイメージを保存しておく

ここにざっくり書かれている

usb reset
setenv bootargs 'console=ttyS0,115200n8 earlyprintk'
setenv bootcmd 'nand read.e 0x1200000 0x200000 0x600000;bootm 0x1200000'
saveenv
fatload usb 0:1 0x1200000 openwrt-kirkwood-netgear_readynas-duo-v2-initramfs-uImage
bootm 0x1200000

コンソールログ→

とりあえずインストールは出来たようだが。。。

BusyBox v1.35.0 (2022-05-20 19:00:24 UTC) built-in shell (ash)

  _______                     ________        __
 |       |.-----.-----.-----.|  |  |  |.----.|  |_
 |   -   ||  _  |  -__|     ||  |  |  ||   _||   _|
 |_______||   __|_____|__|__||________||__|  |____|
          |__| W I R E L E S S   F R E E D O M
 -----------------------------------------------------
 OpenWrt SNAPSHOT, r19689-19ef3b54f4
 -----------------------------------------------------
root@OpenWrt:~# opkg update
Downloading https://downloads.openwrt.org/snapshots/targets/kirkwood/generic/packages/Packages.gz
*** Failed to download the package list from https://downloads.openwrt.org/snapshots/targets/kirkwood/generic/packages/Packages.gz

Downloading https://downloads.openwrt.org/snapshots/packages/arm_xscale/base/Packages.gz
*** Failed to download the package list from https://downloads.openwrt.org/snapshots/packages/arm_xscale/base/Packages.gz

Downloading https://downloads.openwrt.org/snapshots/targets/kirkwood/generic/kmods/5.10.115-1-5e89d550415de5334e3e9ca9aff7b1a0/Packages.gz
*** Failed to download the package list from https://downloads.openwrt.org/snapshots/targets/kirkwood/generic/kmods/5.10.115-1-5e89d550415de5334e3e9ca9aff7b1a0/Packages.gz

Downloading https://downloads.openwrt.org/snapshots/packages/arm_xscale/luci/Packages.gz
*** Failed to download the package list from https://downloads.openwrt.org/snapshots/packages/arm_xscale/luci/Packages.gz

Downloading https://downloads.openwrt.org/snapshots/packages/arm_xscale/packages/Packages.gz
*** Failed to download the package list from https://downloads.openwrt.org/snapshots/packages/arm_xscale/packages/Packages.gz

Downloading https://downloads.openwrt.org/snapshots/packages/arm_xscale/routing/Packages.gz
*** Failed to download the package list from https://downloads.openwrt.org/snapshots/packages/arm_xscale/routing/Packages.gz

Downloading https://downloads.openwrt.org/snapshots/packages/arm_xscale/telephony/Packages.gz
*** Failed to download the package list from https://downloads.openwrt.org/snapshots/packages/arm_xscale/telephony/Packages.gz

Collected errors:
 * opkg_download: Failed to download https://downloads.openwrt.org/snapshots/targets/kirkwood/generic/packages/Packages.gz, wget returned 4.
 * opkg_download: Check your network settings and connectivity.

 * opkg_download: Failed to download https://downloads.openwrt.org/snapshots/packages/arm_xscale/base/Packages.gz, wget returned 4.
 * opkg_download: Check your network settings and connectivity.

 * opkg_download: Failed to download https://downloads.openwrt.org/snapshots/targets/kirkwood/generic/kmods/5.10.115-1-5e89d550415de5334e3e9ca9aff7b1a0/Packages.gz, wget returned 4.
 * opkg_download: Check your network settings and connectivity.

 * opkg_download: Failed to download https://downloads.openwrt.org/snapshots/packages/arm_xscale/luci/Packages.gz, wget returned 4.
 * opkg_download: Check your network settings and connectivity.

 * opkg_download: Failed to download https://downloads.openwrt.org/snapshots/packages/arm_xscale/packages/Packages.gz, wget returned 4.
 * opkg_download: Check your network settings and connectivity.

 * opkg_download: Failed to download https://downloads.openwrt.org/snapshots/packages/arm_xscale/routing/Packages.gz, wget returned 4.
 * opkg_download: Check your network settings and connectivity.

 * opkg_download: Failed to download https://downloads.openwrt.org/snapshots/packages/arm_xscale/telephony/Packages.gz, wget returned 4.
 * opkg_download: Check your network settings and connectivity.

root@OpenWrt:~# 

WebUIのLuciがインストールできない。

ネットワークに問題ある？
ここ↓を調べよう。
https://openwrt.org/docs/guide-quick-start/troubleshooting_internetconnectivity