Asus RT-N66U

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mstombs
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Joined: 31 Oct 2007
Posts: 151

PostPosted: Sat Jun 09, 2012 14:20    Post subject: Re: RT-N66 Replacement Reply with quote
LOM wrote:
This has nothing to do with the kernel running on the routers cpu.
The microcontroller internal to the wifi/radio chips is not part of the linux kernel and is btw not user programmable.


Thanks - and apologies for OT - I remember now the drivers include the microcode for the wifi, hence the use of the "cutter" to extract in Linux desktop tools. But wouldn't be surprised with ARM taking over routers in the future - just like it has in mobiles and I just received a Raspberry PI with its Broadcom SOC with ARM core....
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furlonghokie
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Joined: 12 Aug 2011
Posts: 19

PostPosted: Sun Jun 10, 2012 22:58    Post subject: back with another dumb question Reply with quote
regardless of what firmware i'm using (stock or dd-wrt), if i connected 2 n66u's WIRED, would I need any sort of special setups on either router in order to allow for both routers to send out the same ssid and allow wireless connectivity to both?

How should I go about performing this task?
Dark_Shadow
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Joined: 31 Aug 2009
Posts: 2448
Location: Third Rock from the Sun

PostPosted: Sun Jun 10, 2012 23:36    Post subject: Re: back with another dumb question Reply with quote
furlonghokie wrote:
regardless of what firmware i'm using (stock or dd-wrt), if i connected 2 n66u's WIRED, would I need any sort of special setups on either router in order to allow for both routers to send out the same ssid and allow wireless connectivity to both?

How should I go about performing this task?
See wiki for Linking Routers.
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cythraul
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Joined: 06 Mar 2012
Posts: 3

PostPosted: Mon Jun 11, 2012 17:21    Post subject: Reply with quote
FYI, just found someone who's taking pre-orders for that new gem:

http://www.excaliberpc.com/617732/asus-rt-ac66u-802.11ac-dual-band-wireless-ac1750.html
alternety
DD-WRT Novice


Joined: 15 Jul 2011
Posts: 6

PostPosted: Mon Jun 11, 2012 23:48    Post subject: Reply with quote
Hmmm. That is annoying. It is only $20 more than the RT-N66U. Which arrived two days ago. I ignored it because I had seen posts about how expensive it was.
joecop67
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Joined: 09 Feb 2012
Posts: 425
Location: Columbus, Ohio

PostPosted: Tue Jun 12, 2012 0:56    Post subject: Reply with quote
deleted

Last edited by joecop67 on Wed Aug 29, 2012 20:13; edited 1 time in total
Fractal
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Joined: 19 Apr 2010
Posts: 1243

PostPosted: Tue Jun 12, 2012 15:04    Post subject: Reply with quote
joecop67 wrote:
Would it be possible to get a wiki on hiw to install dd-wrt on this router? I've seen a couple write ups in this post but I would feel a lot more confident if it came from an "official" source.
Maybe someone is planning to, just waiting on Asus to fix the nvram issue first?


I would like to see the nvram issue fixed, however looks like the asus camp is working on 802.11ac, I hope that router has more than 32k nvram... Its been a quiet month from them

-Fractal
joecop67
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Joined: 09 Feb 2012
Posts: 425
Location: Columbus, Ohio

PostPosted: Tue Jun 12, 2012 19:19    Post subject: Reply with quote
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Last edited by joecop67 on Wed Aug 29, 2012 20:13; edited 1 time in total
adamcb
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Joined: 26 Jul 2006
Posts: 26

PostPosted: Wed Jun 13, 2012 15:33    Post subject: Reply with quote
Has anyone heard any update from ASUS as to when they might be able to release a new firmware? I had my RT-N66U lose all the settings the other day and I am guessing it was an NVRAM issue.

Thanks!
ellnic
DD-WRT Novice


Joined: 14 Jun 2012
Posts: 17

PostPosted: Thu Jun 14, 2012 16:23    Post subject: Reply with quote
I am also interested to find out if Asus are going to fix this (properly).

I am going to be in the market for a new router in the next couple of months and I have been following this thread for some time now. I went through the DD-WRT supported list for quite some time researching the right router and eventually arrived on Asus. I'm a long standing Netgear user and have used DGTeam on my DG834. At first, I was thinking about the N16.. which would probably suit me fine, but it's not dual band. Then I moved onto N66U but now with the announcement of the AC66U, i'm not sure :/

Hopefully this NVRAM issue will get sorted soon... and also I hope the AC66U has 64K out the box....
ellnic
DD-WRT Novice


Joined: 14 Jun 2012
Posts: 17

PostPosted: Fri Jun 15, 2012 9:15    Post subject: Reply with quote
I just got an email from Asus:

"The implementation of 64KB NVRAM is not done via CFE. The CFE remains 32KB because only the firmware restore is done there so if we changed it, it would fail. The CFE being 32KB shouldn’t cause a problem though as far as I know. If there are any particular concerns you have regarding the CFE, let me know and I’ll check with our R&D.

The AC66U does have 64KB NVRAM."
adamcb
DD-WRT Novice


Joined: 26 Jul 2006
Posts: 26

PostPosted: Fri Jun 15, 2012 13:38    Post subject: Reply with quote
When I start my router I get this:

Dec 31 19:00:06 kernel: Physically mapped flash: CFI does not contain boot bank location. Assuming top.
Dec 31 19:00:06 kernel: number of CFI chips: 1
Dec 31 19:00:06 kernel: cfi_cmdset_0002: Disabling erase-suspend-program due to code brokenness.
Dec 31 19:00:06 kernel: Flash device: 0x2000000 at 0x1c000000
Dec 31 19:00:06 kernel: Creating 5 MTD partitions on "Physically mapped flash":
Dec 31 19:00:06 kernel: 0x00000000-0x00040000 : "pmon"
Dec 31 19:00:06 kernel: 0x00040000-0x01f40000 : "linux"
Dec 31 19:00:06 kernel: 0x0013b400-0x01280000 : "rootfs"
Dec 31 19:00:06 kernel: 0x01f40000-0x01fe0000 : "jffs2"
Dec 31 19:00:06 kernel: 0x01fe0000-0x02000000 : "nvram"
Dec 31 19:00:06 kernel: Found an serial flash with 0 0KB blocks; total size 0MB
Dec 31 19:00:06 kernel: sflash: found no supported devices
Dec 31 19:00:06 kernel: _nvram_init: allocat header: 2280914944, size= 32768

The NVRAM is allocated to 32768...

I'm not familiar with everything involved but it appears it's creating partitions in the flash... seems you could just increase the partition size but surely it's not that simple Wink
Fractal
DD-WRT Guru


Joined: 19 Apr 2010
Posts: 1243

PostPosted: Fri Jun 15, 2012 14:43    Post subject: Reply with quote
adamcb wrote:
When I start my router I get this:

Dec 31 19:00:06 kernel: Physically mapped flash: CFI does not contain boot bank location. Assuming top.
Dec 31 19:00:06 kernel: number of CFI chips: 1
Dec 31 19:00:06 kernel: cfi_cmdset_0002: Disabling erase-suspend-program due to code brokenness.
Dec 31 19:00:06 kernel: Flash device: 0x2000000 at 0x1c000000
Dec 31 19:00:06 kernel: Creating 5 MTD partitions on "Physically mapped flash":
Dec 31 19:00:06 kernel: 0x00000000-0x00040000 : "pmon"
Dec 31 19:00:06 kernel: 0x00040000-0x01f40000 : "linux"
Dec 31 19:00:06 kernel: 0x0013b400-0x01280000 : "rootfs"
Dec 31 19:00:06 kernel: 0x01f40000-0x01fe0000 : "jffs2"
Dec 31 19:00:06 kernel: 0x01fe0000-0x02000000 : "nvram"
Dec 31 19:00:06 kernel: Found an serial flash with 0 0KB blocks; total size 0MB
Dec 31 19:00:06 kernel: sflash: found no supported devices
Dec 31 19:00:06 kernel: _nvram_init: allocat header: 2280914944, size= 32768

The NVRAM is allocated to 32768...

I'm not familiar with everything involved but it appears it's creating partitions in the flash... seems you could just increase the partition size but surely it's not that simple Wink


I have posted on this before: hacking the kernel to see more than 32k if the CFE doesnt support it is bad... Here is what happens:

Jun 19 21:05:19 Panic: Error writing to block 0x010e01ea

Kernel panic - not syncing: Fatal exception in interrupt

-Fractal
Dark_Shadow
DD-WRT Guru


Joined: 31 Aug 2009
Posts: 2448
Location: Third Rock from the Sun

PostPosted: Fri Jun 15, 2012 16:44    Post subject: Reply with quote
ellnic wrote:
I just got an email from Asus:

"The implementation of 64KB NVRAM is not done via CFE. The CFE remains 32KB because only the firmware restore is done there so if we changed it, it would fail. The CFE being 32KB shouldn’t cause a problem though as far as I know. If there are any particular concerns you have regarding the CFE, let me know and I’ll check with our R&D.

The AC66U does have 64KB NVRAM."
Of coarse there is a problem, there is not enough of it for this router.
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RMerlin
DD-WRT User


Joined: 05 Mar 2012
Posts: 273

PostPosted: Fri Jun 15, 2012 17:14    Post subject: Reply with quote
Asus released the GPL sources for the RT-AC66U firmware (3.0.0.4.140). I only had a few mins to browse through it before leaving for work, but I noticed a new build option that's enabled by default:

NVRAM_64K=y

Interesting note: target.mak sets this option by default for both the RT-N66U and RT-AC66U. Makes me wonder if the AC66U wouldn't also have its CFE configured for 32K, and be entirely relying on the firmware part to address the whole 64K.

In theory, a 32K CFE shouldn't be an issue as long all the hardware-related settings in nvram are found in the initial 32K. Just like, for example, old PC boot loaders couldn't boot an OS if the partition was beyond the first few gigs of disk space, but the OS was fully capable of addressing the whole disk space.

For third party firmwares, this would probably require to look at Asus's code to figure out how they handle the nvram extension. It's possible they locate the partition signature, and extend that to 64K instead of 32K to determine the end location. I'll probably know more once I get the chance to study the build 140 sources more in depth.
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