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My Content
11 Aug 2007

looks like some nice features, 128MB of ram, wifi bluetooth, CF SD video out and a 2700G coupled to an intel pxa270 @ 416Mhz

i know i am getting one, its intresting that they say that it wont support bluetooth file trasfers, i hope they are not reinventing the wheel instead of using the bluez stuff.
31 May 2007
saw this today and thought someone with an older Z might be intrested

19 Apr 2007
THere have been a couple of new kernel options that have been introduced latley and i am wondering if any one else knows about them or wants to comment

the first is the "tickless kernel" which does away with "switch tasks every 1000hz" and changes it to "go to sleep until somthing needs the cpu. as we all know doing a hlt or simmilar saves power and it allows for great power savings when put together with other things

the other new one in the next kernel is compleatly fair queing (http://kerneltrap.org/node/8059), sounds intresting to me but from what i can see this will play very nicly with the above tickless kernel. the advantages of this squedular is better responsivness, faster and less relinace on ticks and jiffies (i belive it uses nano second tracking of execution time)

i should mention laptop mode here for compleatness, its been around for awhile but afaik it is very rarely enabled. what it does is only spin up the hard drive when somthing needs to be read OR a ceritn amount of time has elapsed. it stores all the writes and writes them together to help avoid the "power dump" on hard drive spin up and makes the drive idle longer

one of the more obvios ones is cpufreq scaling which explains its self, combined this with policies (cpufreqd anyone, powernowd or others dont really have the same featureset as it can ramp up the speed when you launch mplayer rather on the load as to avoid ossiclations where you go from 100% to 75% and repeat

well those are some of the options, now for the question. has anyone done some power testing with diffrent kernel options? i blew the power supply on my last Z (about to get a new one) but it still works so i was planning to hook up a multimeter with datalogging via rs232 and do some automated powertesting with the dead unit.

any intrest in doing so? what do you want tested. in an ideal world i would love to see what an arch optimised vs processor optimised kernel/userspace does and EABI vs the normal stuff

i dont belive it would be too hard to set it up so the Z is permanttly net connected as well for a dev enviroment or to run your own power testing stuff however i see the timeframe on that one bieng about 2 months

i am aming to punch up the idle load run time by at least 3 hours and the mp3 playing load by 1 hour. moive playback i am aiming for 30 minutes however this one is hard to quanitfy as there are many diffrent moive types that are optimised diffrently for the Z (ie divx, mpeg4, xvid, h263, not to mention container formats)
30 Mar 2007
Well i never thought i would be asking someone else for linux help but i guess its my last option smile.gif ethire that or reinstall windows wink.gif

anyway i am having a wierd problem, at first i couldnt ssh into my server (on the internet (pocketnix.org)) however i soon relised i couldnt contact any service on my host from my OS

my quick patch was to ssh into another server and then from there ssh into the pocketnix server, works fine but port fowarding is a b#@% in that senario

anyway i tested trying to contact the server on several machines, works on my PDA (behind the same nat as my home PC) works on a debian VM on my machine (What the?!?!?) however dosent work on any other fedora core 6 machines

now it might have been a kernel update (thinking congestion control or one of those options that says "dont enable me or i cant talk to 1/2 the internet", yes there is one of those in the kernel) or a ssh update

i have tried everything related to mtu size changing however running wireshark on the services seems to indicate that the connection is made and works fine untill the connection "get serious" ie with imaps it cuts off after the ssl handshake, ssh when auth protocols are bieng exchanged "SSH2_MSG_KEXINIT" and with http after the GET command

i recive no errors until i close the connection in which case i get retransmitted packet errors

i am thikning its a problem with my router, to say its unreliable is an understatment, i drop the connection on a regular baisis (some cases every 5 mins under load) and cant get rid of it as its the adsl modem as well (last time i let some one else handle the "details")

any ideas, im guessing its a fedora only problem (seen enough of those) and am willing to change however i am looking at changing to a 64 bit distro that works, fedora wont boot, debian hangs at the language selection part of the install and misc bad things happen with all teh other distros

beginig to think the computer haunted, anyway if you have any ideas pleas reply, im at my wits end after the problems that have plauged me in the last week (kernel that crashes x secconds after boot, you can time your watch to it and a usb hub between the keyboard and PC that wasent getting properly reset by the bios and hanging the bios leaving me 2 days of diagnostics before i replugged the hub and restarted it)
10 Mar 2007
Well as some of you may have noticed there hasent been much work as off late.

this is mainly due to the software issue, ie what pcb tools will i use. well i had a look at the "pcb" program on sf.net and it seems it now includes an autorouter, i dont know how good it is but ill give it a try. its still lacking features i "want" but i belive at thius point in time that i could do the project with the software in its current state

so basically it looks like gEDA and pcb forthe pcb and scehmatic software, this is probbelly a better thing than what i wanted to use as most peopel who are want to take a look wouldnt need to buy expensive software, but those people probelly wouldnt mind the pictures smile.gif

i will give it a spin in the next couple of weeks, i have some free time coming up again so i think its time for the feature freze and some diagarms, at the least i will have the power supply up which should be "fault tollirent" unlike whatever they put in my Z sad.gif, it should also be able to exceed 0.5A on the usb socket, not recomeneded of course but those who need a bit of surge power to jump start a usb drive will apreciate this.

i will try and design it for 0.7A @ 5v normally and 2A surge (basically using caps for the surge, if you dont need this feature then drop the caps but considering how they are less than a cent anyway i dont see the point)

if i get a chance i will knock up some of the pelimanary usb to iMX3 stuff and some of the support circitry (ie clocks and passives) as these always need to be double checked (you always forget somthing). this is somthing that a non technical person can do, just look at the page numbers i provide as refrence and double check the wiring looks the same in thier examples asit is in the pics i provide, and check the svalues are the same except where stated.

i will have to look at a couple of IO things as well, did anyone want a rs232 level serial port (12v to -12v) or ttl (5v to 0v), is an SPI header somthing that people want (ie add user sensors) and do you want i2c, if so a dedicated connection (ie no devices on the bus) or a shared one (cheaper for me, you only have to be careful that when you add a device you dont use an exsisting device)

some other features others may not have cconsidered, besides the gyroscope/accereometer would you like features like a compus? or teamprature?, i was thinking that a temp sensor on the cpu and an ambient one would be nice, easy to do with I2C. perhaps one near the battery and power supply would be advisable as well.

well thoughts and input people, this week is out but next week the holidays begin (much to my relief)
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