OpenWrt on Buffalo WHR-600D

Installing and Using OpenWrt
1

Hi,
I got a Buffalo WHR-600D with DD-WRT (the pro version supplied by Buffalo).
I like the OpenWRT better and want to install it on the router, but firmware upgrading with http://downloads.openwrt.org/releases/18.06.1/targets/ramips/mt7620/openwrt-18.06.1-ramips-mt7620-whr-600d-squashfs-sysupgrade.bin (linked from the WHR-600D WIKI page) through DD-WRT webinterface does not work - DD-WRT still remain in the flash.
I am familiar with booting the router from TFTP (having unbricked it a couple of times), but I guess that I need an openwrt initramfs image?!? If that is the case, how do I obtain such an image? (I can't find it in the release file structure)

Thanks in advance,
Christian

2

Okay, I compiled the initramfs for the WHR-600D and booted it over tftp - but the router just restarts.
I disassembled the router and soldered on a serial port to see what is going on - It seems that the kernel panics:

[    7.512283] Call Trace:
[    7.517146] [<800d074c>] kfree+0x7c/0x164
[    7.525136] [<82e77020>] rt2x00lib_free_eeprom_file+0x18/0x38 [rt2x00lib]
[    7.538667] [<82e71edc>] rt2x00lib_probe_dev+0x8d8/0x968 [rt2x00lib]
[    7.551327] [<82f7d27c>] rt2x00pci_probe+0x230/0x284 [rt2x00pci]
[    7.563297] [<801ce898>] pci_device_probe+0x98/0x140
[    7.573185] [<801fe888>] really_probe+0x140/0x2b8
[    7.582550] [<801feaa4>] __driver_attach+0xa4/0xdc
[    7.592087] [<801fcab4>] bus_for_each_dev+0x5c/0xbc
[    7.601800] [<801fddf4>] bus_add_driver+0xf8/0x218
[    7.611341] [<801ff320>] driver_register+0xac/0xfc
[    7.620878] [<80004650>] do_one_initcall+0xd0/0x1a0
[    7.630597] [<80078034>] do_init_module+0x74/0x1d0
[    7.640137] [<8007724c>] load_module+0x1f6c/0x2354
[    7.649674] [<80077754>] SyS_init_module+0x120/0x17c
[    7.659565] [<80013fcc>] syscall_common+0x34/0x58
[    7.668925] Code: 30630001  14600002  00000000 <000c000d> 8c430000  7c6303c0  10600003  00000000  10000002 
[    7.688358] 
[    7.691366] ---[ end trace 5aa4d8b89d055647 ]---
[    7.702829] Kernel panic - not syncing: Fatal exception

Any ideas how to proceed?

The complete bootlog is available here:

3

...and here is the boot log of the Buffalo firmware:

4

Hmmm... just read How to flash LEDE onto Buffalo WHR-1166D? and just as an experiment I tried booting the WHR-600D with the raminitfs Robin Panda built for Buffalo WHR-1166D and it boots!
https://www.dropbox.com/s/b6t5dgxcrcsz8no/20181002_OpenWrtForWHR-1166DAndapandaBuildBootlog.txt?dl=0

However the WAN interface does not seem to work.
Any ideas for getting further with this?

5

If the LAN interface works, either change the switch config to use a different port as WAN, or download the proper binary in advance to flash after booting.