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how to unlocked more memory?

Discussion in 'Cisco/Linksys Wireless Routers' started by jagboy, May 8, 2005.

  1. jagboy

    jagboy Network Guru Member

    how could this be achived. i have a wrt54gv2.2 with the 32mb of ram and i wan to use as much as possible. but right now i can only get to 5mb max. how could i squeez more out of it. i am runningdd-wrt pre 4 full. i dont wan to use dd-wrt pre4 basic.

    btw i am hosting a web page in it and i need alot more memeory for what i am going to do.
  2. gotamd

    gotamd Network Guru Member

    I'm definitely not sure that this will work with a v2.2 router, but this website explains it well for a v2.0. Maybe it'll help you. Don't blame me if you brick your router though, I am only the messenger ;)

    BTW, that is the exact procedure I used on my v2.0 to the letter and it worked fine...so I know it works in that case at least.
  3. jagboy

    jagboy Network Guru Member

    what site linksysinfo? you did not post any links
  4. Avenger20

    Avenger20 Network Guru Member

    Are you sure? All v2.2 I've seen have only 16mb of ram.
    You'll have to check manually opening the cover to make sure.
  5. jagboy

    jagboy Network Guru Member

    when i open the cover what will i be looking for?
  6. gotamd

    gotamd Network Guru Member

  7. kovacsi

    kovacsi Network Guru Member

    Be warned. Unlike that site, I don't think you can conclude that you have 32MB from the -7T part of the string (if I remember right, that has to do with timing/speed).
    For the IC/IS ramchips, my conclusion is, that the xx168xx part shows that they 8Mx16 (=16MB) ramchips. And those named xx164xx (4Mx16) are 8MB ramchips.
    WARNING! I haven't verified this conclusion!

    WRT54G ver -2.0 has 2 ramchips. You need to have (two) 8Mx16 ramchips for 32MB.
    WRT54G ver 2.2- has 1 ramchip. You need to have (one) 16Mx16 (or 8Mx32) ramchip for 32MB.

    So I think that the conclusion in the table on the autopsy page http://www.linksysinfo.org/modules.php?name=Content&pa=showpage&pid=6#table is wrong about the WRT54Gv2.2 containing 32MB. According to the table, it has 1x 8Mx16 ramchip. That equals 16MB, not 32.

    BTW, you don't have to open the cover to find the ramchip partname. You can find the partnumber of the ramchip(s) by lighting them up with a flashlight through the holes on top of the router (front/right holes). I don't think it works on WRT54G -v1.1, the ramchips are too close to the board edge.

    For maximum safety, verify the partnumbers you find on the ramchips, on the manufacturer's website (or other place).

    For more ramchips/router combos that (might) work/don't work, check http://forum.bsr-clan.de/viewtopic.php?p=3463#3463 and onwards.

    The usual warning: YOU MUST BE 100% SURE WHAT YOU ARE DOING, OR IT WILL BRICK YOUR ROUTER BADLY! (Only recovered with JTAG?)
  8. jagboy

    jagboy Network Guru Member

    i returned the wrt54gv2.2 and got a wrt54gv2 and a wrt54gS v2
  9. malfeasance

    malfeasance Network Guru Member

    I have a WRT54G v2.2, with the HY5DU281622ET-J chip in it.

    Maybe someone else smarter than me can interpret this info on Hynix's web page:

    Title: DDR SDRAM - 128Mb

    First sentence: "The Hynix HY5DU281622ET is a 134,217,728-bit CMOS Double Data Rate(DDR) Synchronous DRAM ..."

    Next paragraph: "The Hynix 128Mb DDR SDRAMs offer fully synchronous ..."

    Here's the link: http://www.hynix.com/datasheet/eng/dram/details/dram_04_HY5DU281622ET.jsp

    Here is the link to the Hynix's Product Code Part Numbering Scheme - Please look at this:

    This is REALLY getting interesting!!
  10. bmandelj

    bmandelj Network Guru Member



    my WRT54G v2.2 also has hynix HY5DU281622ET-J chip in it
    has anyone tried to unlock this chip?

    or atleast can someone tell me what kind of capacity has this chip

    my fingers are itching ne to try but i would'n like to brick the router
  11. malfeasance

    malfeasance Network Guru Member


    First of all, the link I posted above gives a page for GDDR memory, used for graphics apps, which actually has the same specifications as the DDR chip in the WRT. The second paragraph of this page starts with: "The Hynix 8Mx16 DDR SDRAMs offer fully synchronous operations..." This is actually the answer. The page for the DDR SDRAM on the WRT is actually here: http://www.hynix.com/datasheet/eng/dram/details/dram_02_HY5DU281622ET.jsp

    It does say: "128Mb..." Notice the small 'b' as in 'bit.' This is the answer as well. Notice in my post above and on the web pages for this chip, that the number of bits are listed exactly. Divide 128 by 8 and you get 16: 16MB as in "Bytes."

    The Product Code Numbering Scheme pdf listed in the previous post IS the right one.

    This states that this chip, according to the part of the code '28,' has a Density and Refresh of 128M and 4k refresh. The next sequence of '16' means an organization of 'x 16.' This seemed a little confusing to me since I am a grasshoppah with these memory organizations.

    In the Technical Specification sheet linked on the same page, the organization of this chip is listed as 8M x 16. I'm afraid it has 16MB of memory and no more. If anyone else can interpret the information differently, the Good Doctor would like to know about it.
  12. kovacsi

    kovacsi Network Guru Member

    Re: memory

    It's a 8Mx16 chip = 16MB.

    Since the v2.2 only has one ramchip, it only has 16MB in total.
    So DON'T try to unlock.. IT WILL BRICK THE ROUTER!


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