arm-netbook

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1082 discussions

CM108AH
by Luke Kenneth Casson Leighton 11 Jan '15

11 Jan '15

ironically, i have had a CM108 chipset sitting right here, in continuous use, for about 7 years now. i bought a usb dongle in canada back in 2007. i had my suspicions, and i've been able to open it up and confirm that yes it's the CM108. i've made a couple of minor changes to the tablet's audio circuit as a result. all good! l.

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The Unplanned Obsolescence of the First Fairphone Device « Paul Boddie's Free Software-related blog
by Alexander Stephen Thomas Ross 09 Jan '15

09 Jan '15

https://blogs.fsfe.org/pboddie/?p=802

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tablet, microdesktop and laptop progress
by Luke Kenneth Casson Leighton 09 Jan '15

09 Jan '15

well... some good news, we have sponsors for both the 7in tablet and also a 15in laptop, which is amazing! the laptop we have chosen a 15.6in 1366x768 LCD because anything lower than that (either in size or in pixel resolution) is no longer properly fashionable, it appears, whereas i am surprised to find that 15.6in 1366x768 LCDs are not only extremely popular (over 50,000 for sale on panelook.com), but also their power requirements are far more modest than one might expect: around 3.5 watts for the backlight which is pretty incredible. with the popularity of netbooks and tablets taking over, it kinda makes sense that even 13.3in LCDs are just not hugely popular. so... 15.6in it is. i do want to do a 1920x1080 15.6in... but not right away. i don't want to push things too much (EMI wise) and also even finding the faster RGB/TTL to eDP or dual-LVDS ICs is... tricky. so we tackle that later. the only downside of using 1366x768 is that it is above the limit of 1280x800 set for EOMA68 in a 5.0in form-factor. i am not going to get massively unhappy about this, but the CPU Card has to remain *inside* the unit as a non-user-removable part. the hilarious thing is that the ICubeCorp IC3128 will actually work! i tested it yesterday and it can run 1280x1024 at 60hz (if you set 8bpp - 3Red, 3Green, 2Blue). i find this to be very very funny. a $USD 2 Quad-Flat Package processor running in a 15.6in laptop. with sufficient funding however we may be able to go straight to a 1920x1080 EOMA68-compliant laptop, by redesigning the EOMA68-A20 to fit within the 3.3mm PCMCIA form-factor. that will require some metalwork tooling costs, hence why this hasn't been done yet. the tablet: apologies but i did some _more_ layout changes, i decided to move the USB hub IC right next to the EOMA68 connector, in order to reduce the possibility of impedance mismatch problems (making the USB tracks leading to the USB hub incredibly short). that meant moving the microsd card, that meant moving the power connector and lengthening the board on the right-hand siiide... maan this 3D stuff is tough! :) oh, if anyone is interested, the pyopenscad source code for both the tablet and the laptop are available here: http://hands.com/~lkcl/eoma/kde_tablet/3dcase/ under the GPLv3 software license. l.

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revision 2 EOMA68-IC3128 board works
by Luke Kenneth Casson Leighton 07 Jan '15

07 Jan '15

i'm delighted to be able to announce that the revision 2 of the EOMA68-IC3128 ICubeCorp board is 100% working. the board arrived from HK at the end of last year, but the hub appeared to be not working and neither was the MCS7832 USB-Ethernet IC. it turns out that the hub is working fine: the preliminary kernel support for the IC3128 at present only supports high-speed devices, so for example a mouse or keyboard (which are only USB 1.1 devices) are not recognised but a Genesys Logic USB SD/MMC device, a USB SATA drive, or any other 480mbit/sec device, are all supported. the on-board MCS7832 however was configured (by 3 resistors which should not have been added) to be a low-speed device. removing these three resistors the MCS7832 worked perfectly. given that the kernel support for USB 1.1 speeds is a software issue this board can be added to the crowdfunding campaign as an FSF-Endorseable option. woo! l.

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tablet casework prototype done
by Luke Kenneth Casson Leighton 31 Dec '14

31 Dec '14

http://rhombus-tech.net/community_ideas/kde_tablet/news/ the mendel90 printer is working really well, and was absolutely worth it to use for prototyping of casework. the 7in tablet project is now being done as an open hardware project, under the GPLv3+. files are available at http://hands.com/~lkcl/eoma/kde_tablet with a preliminary casework finished that has been prepared in conjunction with the pcb layout, work can proceed to finalise the pcb and then send it off for assembly. there are a couple of risky areas on the tablet pcb, due to datasheets and app notes simply not being available: the usb audio and the usb camera IC. these are a CM108AH and a Vi Micro VC0345 respectively. perhaps prior to sending off this PCB it may be worthwhile tracking down small USB devices with those chipsets in, in order to inspect them and check their PCB layout. however if anyone already _has_ a USB audio dongle with a CM108AH or a USB camera with a VC0345 chipset please do say so as i would greatly appreciate some hi-res photos of the PCB, both sides. l.

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[Arm-netbook] http://rhombus-tech.net/community_ideas/kde_tablet/news/
by Luke Kenneth Casson Leighton 22 Dec '14

22 Dec '14

started on a first revision of the tablet casework, as a pyopenscad program, using a blender-exported STL as the "ghost" template to work out how the case should surround the parts. it's done as layers so may either be made of wooden laminates or 3D printed and assembled using screws/bolts. l.

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3d printed tablet casework
by Luke Kenneth Casson Leighton 21 Dec '14

21 Dec '14

http://rhombus-tech.net/community_ideas/kde_tablet/news/ turned out okay for a first print. lots of thought required, as 3d printing of parts to use as laminates is not entirely satisfactory. l.

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Unsubscribe from the mailing list
by sahil mehta 17 Dec '14

17 Dec '14

Hi, Kindly un-subscribe this mail id from the mailing list. Thanks

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EOMA68-IC3128 revision 2 back from assembly and is working
by Luke Kenneth Casson Leighton 17 Dec '14

17 Dec '14

http://rhombus-tech.net/icubecorp/IC1T/news/ no hardware faults found, which is fantastic. they have not been sent back to me yet so i have to run some tests here first but this looks like these cpu cards (which are FSF Endorseable) may be added to the crowdfunding campaign. hooray. l.

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tablet rev 3.2 layout
by Luke Kenneth Casson Leighton 16 Dec '14

16 Dec '14

http://rhombus-tech.net/community_ideas/kde_tablet/news/ well it's a fixed PCB size, doesn't have to be a split design, but there's no possibility of sharing this across 2 or more designs. because of that i've cut out the extra components. still working on getting the layout right: the current issue is that the LCD is taller so obscures the middle-centred camera. that means the camera needs to move to the corner. it's an almost never-ending series of details, aaaaaaa!

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