Champion.

I have a Parallella, with a 7= 010, and a Epiphany-III. Was wondering if I'd pull the finger out and p= ort Plan 9, or even pay for it. Seems I might not have to. There is also a = SnowLEO SDR unit that uses a 7010 and a LimeMicro chip (think BladeRF).

Thank you! Great news!

On Fri, Feb 6, 2015 at 6:42 AM, <cinap_lenrek@felloff.net> wrote:

aiju build a computer arround the xilinx zynq-7000 (dualcore = arm
cortex A9 with fpga):

http://= aiju.de/electronics/aijuboard/

and wrote kernel and bootloader here:

http://code.google.com/p/plan9front/source/browse/sys/= src/9/zynq/
http://code.google.com/p/plan9front/source/browse/s= ys/src/boot/zynq/

the kernel supports multiprocessing (with all the caches enabled),
the fpga, gigabit ethernet and displayport. boots over tftp.

http://img.stanleylieber.com/?tags=3Daijuboard

things todo: usb, sata, sdcard.

--
cinap

--001a11c3507c6d5100050e5cb4e6-- From mboxrd@z Thu Jan 1 00:00:00 1970 References: <9cc525189fc0d70c918ad653744ffc68@felloff.net> From: Quintile Content-Type: text/plain; charset=utf-8 In-Reply-To: <9cc525189fc0d70c918ad653744ffc68@felloff.net> Message-Id: Date: Thu, 5 Feb 2015 21:17:42 +0000 To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net> Content-Transfer-Encoding: quoted-printable Mime-Version: 1.0 (1.0) Subject: Re: [9fans] Raspberry Pi 2 Model B Topicbox-Message-UUID: 41ee71b8-ead9-11e9-9d60-3106f5b1d025 ooo! I think we are about to start using zinq's in a new project...=20 I have gotta try it =F0=9F=98=84 -Steve > On 5 Feb 2015, at 19:42, cinap_lenrek@felloff.net wrote: >=20 > aiju build a computer arround the xilinx zynq-7000 (dualcore arm > cortex A9 with fpga): >=20 > http://aiju.de/electronics/aijuboard/ >=20 > and wrote kernel and bootloader here: >=20 > http://code.google.com/p/plan9front/source/browse/sys/src/9/zynq/ > http://code.google.com/p/plan9front/source/browse/sys/src/boot/zynq/ >=20 > the kernel supports multiprocessing (with all the caches enabled), > the fpga, gigabit ethernet and displayport. boots over tftp. >=20 > http://img.stanleylieber.com/?tags=3Daijuboard >=20 > things todo: usb, sata, sdcard. >=20 > -- > cinap From mboxrd@z Thu Jan 1 00:00:00 1970 MIME-Version: 1.0 In-Reply-To: References: <9cc525189fc0d70c918ad653744ffc68@felloff.net> Date: Fri, 6 Feb 2015 08:20:57 +1100 Message-ID: From: Shane Morris To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net> Content-Type: multipart/alternative; boundary=001a11c258764b20ea050e5de179 Subject: Re: [9fans] Raspberry Pi 2 Model B Topicbox-Message-UUID: 41f34684-ead9-11e9-9d60-3106f5b1d025 --001a11c258764b20ea050e5de179 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Hells yes! On Fri, Feb 6, 2015 at 8:17 AM, Quintile wrote: > ooo! I think we are about to start using zinq's in a new project... > > I have gotta try it =F0=9F=98=84 > > -Steve > > > > > > > On 5 Feb 2015, at 19:42, cinap_lenrek@felloff.net wrote: > > > > aiju build a computer arround the xilinx zynq-7000 (dualcore arm > > cortex A9 with fpga): > > > > http://aiju.de/electronics/aijuboard/ > > > > and wrote kernel and bootloader here: > > > > http://code.google.com/p/plan9front/source/browse/sys/src/9/zynq/ > > http://code.google.com/p/plan9front/source/browse/sys/src/boot/zynq/ > > > > the kernel supports multiprocessing (with all the caches enabled), > > the fpga, gigabit ethernet and displayport. boots over tftp. > > > > http://img.stanleylieber.com/?tags=3Daijuboard > > > > things todo: usb, sata, sdcard. > > > > -- > > cinap > > --001a11c258764b20ea050e5de179 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable

Hells yes!

On Fri, Feb 6, 2015 at 8:17 AM, Quintile <steve@quintile= .net> wrote:

ooo! I think w= e are about to start using zinq's in a new project...

I have gotta try it =F0=9F=98=84

-Steve

> On 5 Feb 2015, at 19:42, c= inap_lenrek@felloff.net wrote:
>
> aiju build a computer arround the xilinx zynq-7000 (dualcore arm
> cortex A9 with fpga):
>
> ht= tp://aiju.de/electronics/aijuboard/
>
> and wrote kernel and bootloader here:
>
> http://code.google.com/p/plan9front/source/browse= /sys/src/9/zynq/
> http://code.google.com/p/plan9front/source/bro= wse/sys/src/boot/zynq/
>
> the kernel supports multiprocessing (with all the caches enabled),
> the fpga, gigabit ethernet and displayport. boots over tftp.
>
> http://img.stanleylieber.com/?tags=3Daijuboard
>
> things todo: usb, sata, sdcard.
>
> --
> cinap

--001a11c258764b20ea050e5de179-- From mboxrd@z Thu Jan 1 00:00:00 1970 From: erik quanstrom Date: Thu, 5 Feb 2015 20:19:29 -0800 To: 9fans@9fans.net Message-ID: In-Reply-To: <9cc525189fc0d70c918ad653744ffc68@felloff.net> References: <9cc525189fc0d70c918ad653744ffc68@felloff.net> MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Subject: Re: [9fans] Raspberry Pi 2 Model B Topicbox-Message-UUID: 41f84508-ead9-11e9-9d60-3106f5b1d025 On Thu Feb 5 11:37:56 PST 2015, cinap_lenrek@felloff.net wrote: > aiju build a computer arround the xilinx zynq-7000 (dualcore arm > cortex A9 with fpga): > > http://aiju.de/electronics/aijuboard/ > > and wrote kernel and bootloader here: > > http://code.google.com/p/plan9front/source/browse/sys/src/9/zynq/ > http://code.google.com/p/plan9front/source/browse/sys/src/boot/zynq/ > > the kernel supports multiprocessing (with all the caches enabled), > the fpga, gigabit ethernet and displayport. boots over tftp. > > http://img.stanleylieber.com/?tags=aijuboard > > things todo: usb, sata, sdcard. does anyone have a picture of this board? - erik From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <2d16aeffa48650f514966f0dd493b428@proxima.alt.za> To: 9fans@9fans.net Date: Fri, 6 Feb 2015 06:34:50 +0200 From: lucio@proxima.alt.za In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Subject: Re: [9fans] Raspberry Pi 2 Model B Topicbox-Message-UUID: 420874be-ead9-11e9-9d60-3106f5b1d025 > does anyone have a picture of this board? That sounds like the challenge Olimex used to rise to, back when they started as a prototyping and production board manufacturers. I don't see that that is their focus still, but they surely have not lost their skills. It would be nice to have a community driven project in this case. Maybe we can at least investigate? Lucio. From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Fri, 6 Feb 2015 04:42:45 +0000 Message-ID: <20150206044245.Horde.31yCdc8ft5_FVdcy9xB89Q1@ssl.eumx.net> From: Kurt H Maier To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net> References: <9cc525189fc0d70c918ad653744ffc68@felloff.net> In-Reply-To: User-Agent: Internet Messaging Program (IMP) H5 (6.2.2) Content-Type: text/plain; charset=UTF-8; format=flowed; DelSp=Yes MIME-Version: 1.0 Content-Disposition: inline Subject: Re: [9fans] Raspberry Pi 2 Model B Topicbox-Message-UUID: 420c963e-ead9-11e9-9d60-3106f5b1d025 Quoting erik quanstrom : > > does anyone have a picture of this board? > If you're asking for technical purposes, there's a render at http://9front.org/img/aijuboard.png but I'm not sure that's the final cut. If you're asking for physical proof of its existence, one of the guys who owns one is going to have to feel the need to prove something. khm From mboxrd@z Thu Jan 1 00:00:00 1970 From: erik quanstrom Date: Thu, 5 Feb 2015 20:55:33 -0800 To: 9fans@9fans.net Message-ID: In-Reply-To: <20150206044245.Horde.31yCdc8ft5_FVdcy9xB89Q1@ssl.eumx.net> References: <9cc525189fc0d70c918ad653744ffc68@felloff.net> <20150206044245.Horde.31yCdc8ft5_FVdcy9xB89Q1@ssl.eumx.net> MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Subject: Re: [9fans] Raspberry Pi 2 Model B Topicbox-Message-UUID: 42117046-ead9-11e9-9d60-3106f5b1d025 On Thu Feb 5 20:38:05 PST 2015, khm@sciops.net wrote: > Quoting erik quanstrom : > > > > > does anyone have a picture of this board? > > > > If you're asking for technical purposes, there's a render at > http://9front.org/img/aijuboard.png but I'm not sure that's the > final cut. > > If you're asking for physical proof of its existence, one of the > guys who owns one is going to have to feel the need to prove > something. i was not thinking along those lines. :-( i just wanted to see a picture of the board. the render is nice, but the toy budget is not so large. - erik From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Fri, 6 Feb 2015 05:12:15 +0000 Message-ID: <20150206051215.Horde.6KaZLZuxzo5Yd1H8JJUk9g5@ssl.eumx.net> From: Kurt H Maier To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net> References: <9cc525189fc0d70c918ad653744ffc68@felloff.net> <20150206044245.Horde.31yCdc8ft5_FVdcy9xB89Q1@ssl.eumx.net> In-Reply-To: User-Agent: Internet Messaging Program (IMP) H5 (6.2.2) Content-Type: text/plain; charset=UTF-8; format=flowed; DelSp=Yes MIME-Version: 1.0 Content-Disposition: inline Subject: Re: [9fans] Raspberry Pi 2 Model B Topicbox-Message-UUID: 42157524-ead9-11e9-9d60-3106f5b1d025 Quoting erik quanstrom : > > i was not thinking along those lines. :-( i just wanted to see a picture of > the board. the render is nice, but the toy budget is not so large. > I did spend a bit of time trowling through IRC logs; I could have sworn aiju had posted a photo of a populated (and running) board. I wasn't able to dig up the link. I did find a couple screenshots of 9front running on it -- and of course we wouldn't have the Zynq support code without it! -- but it was a lot of fun hearing aiju talk about different speedbumps he hit while working on the design. And of course it's a really impressive feat, but I'm also firmly in the "can't afford this" camp, sadly. khm From mboxrd@z Thu Jan 1 00:00:00 1970 From: erik quanstrom Date: Thu, 5 Feb 2015 21:35:37 -0800 To: 9fans@9fans.net Message-ID: In-Reply-To: <20150206051215.Horde.6KaZLZuxzo5Yd1H8JJUk9g5@ssl.eumx.net> References: <9cc525189fc0d70c918ad653744ffc68@felloff.net> <20150206044245.Horde.31yCdc8ft5_FVdcy9xB89Q1@ssl.eumx.net> <20150206051215.Horde.6KaZLZuxzo5Yd1H8JJUk9g5@ssl.eumx.net> MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Subject: Re: [9fans] Raspberry Pi 2 Model B Topicbox-Message-UUID: 4287131e-ead9-11e9-9d60-3106f5b1d025 On Thu Feb 5 21:07:18 PST 2015, khm@sciops.net wrote: > Quoting erik quanstrom : > > > > > i was not thinking along those lines. :-( i just wanted to see a picture of > > the board. the render is nice, but the toy budget is not so large. > > > > I did spend a bit of time trowling through IRC logs; I could have sworn > aiju had posted a photo of a populated (and running) board. I wasn't able > to dig up the link. I did find a couple screenshots of 9front running on > it -- and of course we wouldn't have the Zynq support code without it! -- > but it was a lot of fun hearing aiju talk about different speedbumps he > hit while working on the design. And of course it's a really impressive > feat, but I'm also firmly in the "can't afford this" camp, sadly. yes, quite impressive. i did find one screenshot. i'm not sure if i could fit something like this in the toy budget or not. i'm really curious how the keyboard and mouse work with no usb. - erik From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: From: "Steve Simon" Date: Fri, 6 Feb 2015 11:55:30 +0000 To: 9fans@9fans.net In-Reply-To: <90d988e2fd044123c1f033ce87535f1a@hamnavoe.com> MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Subject: Re: [9fans] Raspberry Pi 2 Model B Topicbox-Message-UUID: 429c02e2-ead9-11e9-9d60-3106f5b1d025 See /n/sources/patch/maybe/usb-short-desc That works a treat, thanks Cinap, Richard, and Erik. -Steve From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: Date: Fri, 6 Feb 2015 13:00:33 +0100 From: cinap_lenrek@felloff.net To: 9fans@9fans.net In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Subject: Re: [9fans] Raspberry Pi 2 Model B Topicbox-Message-UUID: 42a34d2c-ead9-11e9-9d60-3106f5b1d025 http://felloff.net/usr/cinap_lenrek/aijuboard/ -- cinap From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: To: 9fans@9fans.net From: Richard Miller <9fans@hamnavoe.com> Date: Fri, 6 Feb 2015 13:57:36 +0000 In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Subject: Re: [9fans] Raspberry Pi 2 Model B Topicbox-Message-UUID: 42aa523e-ead9-11e9-9d60-3106f5b1d025 > http://felloff.net/usr/cinap_lenrek/aijuboard/ http://i1.kym-cdn.com/photos/images/original/000/014/416/X2R4UMUE536Z3WIALA7SKNVKP4RXX22Y.jpeg From mboxrd@z Thu Jan 1 00:00:00 1970 From: erik quanstrom Date: Fri, 6 Feb 2015 06:05:57 -0800 To: 9fans@9fans.net Message-ID: <4de491e64ea5c645bcea010fcb35dbc1@brasstown.quanstro.net> In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Subject: Re: [9fans] Raspberry Pi 2 Model B Topicbox-Message-UUID: 42b8f3c0-ead9-11e9-9d60-3106f5b1d025 On Fri Feb 6 03:56:17 PST 2015, cinap_lenrek@felloff.net wrote: > http://felloff.net/usr/cinap_lenrek/aijuboard/ nice. thank you! - erik From mboxrd@z Thu Jan 1 00:00:00 1970 From: erik quanstrom Date: Fri, 6 Feb 2015 06:18:19 -0800 To: 9fans@9fans.net Message-ID: In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Subject: Re: [9fans] Raspberry Pi 2 Model B Topicbox-Message-UUID: 42c1c6a8-ead9-11e9-9d60-3106f5b1d025 On Fri Feb 6 03:51:08 PST 2015, steve@quintile.net wrote: > See /n/sources/patch/maybe/usb-short-desc >=20 > That works a treat, > thanks Cinap, Richard, and Erik. great. the 9atom version of usb improves on the original by adjusting a few constants to the standard. but the main fix is several places where a devices could return a lot of data, asking only for enough return data to get the true size, then asking for the exact amount of data the device claims. i've also reworked the pc scancode interface which was originally used with a copy of the scancode data for every arch into one that's shared by all using /dev/kbin, which now includes the actual pc keyboard. many lines of redundant code bit the dust. the reason things are still scan code based and not usb code based is that /dev/kbmap uses scan code translation directly. it would be nice to have the keyboard map say CapsLock -> LeftCtlr Shift+Function12 -> '=E2=98=BA instead of dealing with scan codes, but it may be more trouble than it's worth. (the 9atom usb/kb should work fine with older kernels.) - erik From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: To: 9fans@9fans.net From: Richard Miller <9fans@hamnavoe.com> Date: Fri, 6 Feb 2015 18:13:52 +0000 In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Subject: Re: [9fans] Raspberry Pi 2 Model B Topicbox-Message-UUID: 42cf2f3c-ead9-11e9-9d60-3106f5b1d025 To return to the original subject ... /n/sources/contrib/miller/9pi2 is a Plan 9 kernel which runs on the Raspberry Pi 2 (one core only, so far). I'll put updated source in contrib/miller/9/bcm later today. mk CONF'='pi2 for the new model, CONF'='pi for the original model. Plan 9 from Bell Labs firmware: rev 1422642103 cpu0: 900MHz ARM Cortex-A7 r0p5 fp: 32 registers, simd fp: arm arch VFPv3+ with common VFP subarch v2; rev 5 eMMC external clock 250 Mhz #u/usb/ep1.0: dwcotg: port 0X0 irq 9 992M memory: 200M kernel data, 792M user, 3762M swap usb/hub... usb/ether... etherusb smsc: b827eb4f2fbd usb/kb... usb/kb... root is from (local, tcp)[local]: tcp Even with one core activated, the rpi2 is noticeably quicker than the rpi. Decoding a 1600x1200 jpeg with 'jpg -t' (from ramfs) takes about 5.8s on rpi, 3.2s on rpi2. Note that the publicity says 900Mhz, but the firmware boots at 600Mhz, and relies on dynamic clock and voltage management in linux to adjust the speed. To get a fixed 900Mhz speed, I put this in config.txt: kernel=9pi2 gpu_mem=16 disable_overscan=1 arm_freq=900 force_turbo=1 Disclaimer: if you put silly numbers in arm_freq, bad stuff might happen. Supposedly the firmware detects this and sets an irreversible bit somewhere that voids your warranty. From mboxrd@z Thu Jan 1 00:00:00 1970 MIME-Version: 1.0 In-Reply-To: References: Date: Fri, 6 Feb 2015 10:18:41 -0800 Message-ID: From: Joe Bowers To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net> Content-Type: multipart/alternative; boundary=001a11c2f02847de56050e6f739b Subject: Re: [9fans] Raspberry Pi 2 Model B Topicbox-Message-UUID: 42d72cb4-ead9-11e9-9d60-3106f5b1d025 --001a11c2f02847de56050e6f739b Content-Type: text/plain; charset=UTF-8 FANTASTIC! Thank you so much! That's so cool! On Fri, Feb 6, 2015 at 10:13 AM, Richard Miller <9fans@hamnavoe.com> wrote: > To return to the original subject ... > > /n/sources/contrib/miller/9pi2 is a Plan 9 kernel which runs on the > Raspberry Pi 2 (one core only, so far). I'll put updated source > in contrib/miller/9/bcm later today. mk CONF'='pi2 for the new > model, CONF'='pi for the original model. > > Plan 9 from Bell Labs > firmware: rev 1422642103 > cpu0: 900MHz ARM Cortex-A7 r0p5 > fp: 32 registers, simd > fp: arm arch VFPv3+ with common VFP subarch v2; rev 5 > eMMC external clock 250 Mhz > #u/usb/ep1.0: dwcotg: port 0X0 irq 9 > 992M memory: 200M kernel data, 792M user, 3762M swap > usb/hub... usb/ether... > etherusb smsc: b827eb4f2fbd > usb/kb... usb/kb... root is from (local, tcp)[local]: tcp > > Even with one core activated, the rpi2 is noticeably quicker than > the rpi. Decoding a 1600x1200 jpeg with 'jpg -t' (from ramfs) > takes about 5.8s on rpi, 3.2s on rpi2. > > Note that the publicity says 900Mhz, but the firmware boots at > 600Mhz, and relies on dynamic clock and voltage management in > linux to adjust the speed. To get a fixed 900Mhz speed, I put > this in config.txt: > > kernel=9pi2 > gpu_mem=16 > disable_overscan=1 > arm_freq=900 > force_turbo=1 > > Disclaimer: if you put silly numbers in arm_freq, bad stuff > might happen. Supposedly the firmware detects this and sets > an irreversible bit somewhere that voids your warranty. > > > --001a11c2f02847de56050e6f739b Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable

FANTASTIC! Thank you so much! That's so cool!

On Fri, Feb 6, 2015 = at 10:13 AM, Richard Miller <9fans@hamnavoe.com> wrote:
=

To return to the original subject ...

/n/sources/contrib/miller/9pi2 is a Plan 9 kernel which runs on the
Raspberry Pi 2 (one core only, so far).=C2=A0 I'll put updated source in contrib/miller/9/bcm later today.=C2=A0 mk CONF'=3D'pi2 for the = new
model, CONF'=3D'pi for the original model.

=C2=A0 =C2=A0 =C2=A0 =C2=A0 Plan 9 from Bell Labs
=C2=A0 =C2=A0 =C2=A0 =C2=A0 firmware: rev 1422642103
=C2=A0 =C2=A0 =C2=A0 =C2=A0 cpu0: 900MHz ARM Cortex-A7 r0p5
=C2=A0 =C2=A0 =C2=A0 =C2=A0 fp: 32 registers,=C2=A0 simd
=C2=A0 =C2=A0 =C2=A0 =C2=A0 fp: arm arch VFPv3+ with common VFP subarch v2;= rev 5
=C2=A0 =C2=A0 =C2=A0 =C2=A0 eMMC external clock 250 Mhz
=C2=A0 =C2=A0 =C2=A0 =C2=A0 #u/usb/ep1.0: dwcotg: port 0X0 irq 9
=C2=A0 =C2=A0 =C2=A0 =C2=A0 992M memory: 200M kernel data, 792M user, 3762M= swap
=C2=A0 =C2=A0 =C2=A0 =C2=A0 usb/hub... usb/ether...
=C2=A0 =C2=A0 =C2=A0 =C2=A0 etherusb smsc: b827eb4f2fbd
=C2=A0 =C2=A0 =C2=A0 =C2=A0 usb/kb... usb/kb... root is from (local, tcp)[l= ocal]: tcp

Even with one core activated, the rpi2 is noticeably quicker than
the rpi.=C2=A0 Decoding a 1600x1200 jpeg with 'jpg -t' (from ramfs)=
takes about 5.8s on rpi, 3.2s on rpi2.

Note that the publicity says 900Mhz, but the firmware boots at
600Mhz, and relies on dynamic clock and voltage management in
linux to adjust the speed.=C2=A0 To get a fixed 900Mhz speed, I put
this in config.txt:

=C2=A0 =C2=A0 =C2=A0 =C2=A0 kernel=3D9pi2
=C2=A0 =C2=A0 =C2=A0 =C2=A0 gpu_mem=3D16
=C2=A0 =C2=A0 =C2=A0 =C2=A0 disable_overscan=3D1
=C2=A0 =C2=A0 =C2=A0 =C2=A0 arm_freq=3D900
=C2=A0 =C2=A0 =C2=A0 =C2=A0 force_turbo=3D1

Disclaimer: if you put silly numbers in arm_freq, bad stuff
might happen.=C2=A0 Supposedly the firmware detects this and sets
an irreversible bit somewhere that voids your warranty.