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EOMA68-jz4775 first usb-loader hello-world success
by Luke Kenneth Casson Leighton 06 Jan '16

06 Jan '16

http://rhombus-tech.net/ingenic/jz4775/news/ yippeee! the jz4775 cpu card didn't blow up, instead it announced itself on the usb bus, and i was able to modify a CI120 usbloader i found, to upload a UART0-based "hello world" program. next phase would be to initialise the DDR3 RAM, then compile and upload u-boot into DDR3 RAM and execute it. all very exciting

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EOMA68-jz4775
by Luke Kenneth Casson Leighton 05 Jan '16

05 Jan '16

Jan 5 14:46:28 bigmac kernel: [1081446.769734] usb 1-2: new high-speed USB device number 86 using xhci_hcd Jan 5 14:46:28 bigmac kernel: [1081446.898689] usb 1-2: New USB device found, idVendor=a108, idProduct=4775 Jan 5 14:46:28 bigmac kernel: [1081446.898693] usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0 Jan 5 14:46:28 bigmac kernel: [1081446.898694] usb 1-2: Product: JZ4775 USB Boot Device Jan 5 14:46:28 bigmac kernel: [1081446.898696] usb 1-2: Manufacturer: Ingenic # lsusb Bus 001 Device 086: ID a108:4775 yippeee, it didn't blow up :) PMIC voltages are good. 1.2, 1.5, 1.8, 2.5, 3.3. whew....

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EOMA68 A20 Libre 15.6in Laptop prototype PCBs, first fully-functioning boot
by Luke Kenneth Casson Leighton 04 Jan '16

04 Jan '16

http://rhombus-tech.net/community_ideas/laptop_15in/news/EOMA68_Libre_15.6i… hardware all fully-functional, despite drawing too much power during the audio test. power is currently hard-wired to a temporary location that will be sorted out when PCB3 is replaced with a board that uses the TI bq24196 - a much better PMIC that is properly compliant with the USB-OTG Power Specification. this is really exciting as it will not be long before a fully-assembled prototype is up and running. l.

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libre 15.6in laptop 2 extra videos
by Luke Kenneth Casson Leighton 03 Jan '16

03 Jan '16

pre-assembly explanation and walk-through videos now available: http://rhombus-tech.net/community_ideas/laptop_15in/news/ this is all prior to first power-up. i'm honestly slightly nervous about powering the boards up when they're wired together like this, because the slightest short-circuit or incorrect cable and it'll damage things. although i do have some revision 1.0 EOMA68-A20 CPU Cards left, i'd rather no more were damaged! still, i've tested them all individually - it should be fine. l.

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libre laptop PCB2 video, STM32F072 dual USB endpoint demo and explanation
by Luke Kenneth Casson Leighton 02 Jan '16

02 Jan '16

http://rhombus-tech.net/community_ideas/laptop_15in/news/ did a quick video showing the disassembled chicony keyboard matrix working and generating USB-HID events at the same time as CDC-ACM (usb serial) responding. l.

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keyboard matrix (and usb-hid stm32f072 firmware) functional
by Luke Kenneth Casson Leighton 27 Dec '15

27 Dec '15

http://rhombus-tech.net/community_ideas/laptop_15in/news/PCB2_prototype_fun… i'll make a short video once the camera's battery is charged up - i have yet to do the keyboard modifiers (shift, ctrl) however everything else is properly functional. with 1st revision prototype firmware available as GPLv2+ source, which has at least proven that the hardware is operational, i can move on to the audio circuits tomorrow, and after that can begin assembly. l.

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first revision eoma68 jz4775 cpu cards assembled
by Luke Kenneth Casson Leighton 26 Dec '15

26 Dec '15

http://rhombus-tech.net/ingenic/jz4775/news/26dec2015_pcb_rev1_populated/ still to be tested but they've actually been assembled. l.

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chicony keyboard matrix reverse-engineering
by Luke Kenneth Casson Leighton 24 Dec '15

24 Dec '15

http://rhombus-tech.net/community_ideas/laptop_15in/news/Chicony_keyboard_m… the article about keyboard matrix design, linked from the above, is quite interesting. keyboard design turns out to be fascinatingly complex for something that we take for granted every day. l.

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LWN: Hands on with the pi-top
by Paul Boddie 17 Dec '15

17 Dec '15

Hello, I thought that some of you might be interested in this, at least in the context of laptop projects, what other people are doing, and the finished products: http://lwn.net/Articles/667040/ I guess the Raspberry Pi aspect of it means that people are willing to throw their money at something that doesn't really seem to be a particularly good product: tied to the RPi, no speakers or audio outputs (apart from on the RPi board itself), the usual proprietary software dependencies and promotional activity, reportedly dodgy keyboard... Also of interest is that their desktop version recently got funded very quickly indeed. Again, the same RPi dependencies and constraints apply. I guess it shows that there's a market for such stuff, even if (or especially if) you take the RPi cargo culture out of the equation. Paul

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early alpha production run of libre laptop PCBs, microdesktops and CPU Cards
by Luke Kenneth Casson Leighton 16 Dec '15

16 Dec '15

it's a little early but i wanted to get a poll out of people who might be interested to buy the PCBs (and other parts) as a kit, for both the libre laptop PCBs and the microdesktop units. when i say "early" i mean "there's pretty much no software" - i have preliminary working firmware that i'm using to confirm that various hardware functions work (keyboard, touchscreen, battery monitoring), however as for actual "useable drivers", those do not exist and will need to be written. this is therefore a solicitation for assistance in writing the drivers as much as it is an offer for people to be involved and have extremely-early hardware. the casework for the laptop is available as GPL pyopenscad files: i could potentially print some up for people but would prefer it if you used an online 3d printing service or local hackerspace. the micro-desktop, in direct contrast to the laptop, requires absolutely no drivers whatsoever and works straight away. estimated low-volume (5-10) pricing is going to be somewhere around: * eoma68-jz4775 CPU Card: $300 (cost of 5 PCBs is $1500) * eoma68-a20 CPU Card: same. * laptop main PCB1: $150 * laptop E/C PCB2: $120 * laptop PMIC PCB3: $120 * microdesktop PCB: $150 * laptop battery: $12 * 15.6in LCD: $50 (obtainable on ebay) * Chicony Keyboard: $20 (again, obtainable on ebay) * USB-UART: $5 (obtainable on ebay or adafruit or digikey or anywhere) there are various other sundries that are needed - cables, connectors etc. i can put together kits for people. if we can get as high as 25 units on particular boards, that pricing is likely to drop by something like 25%, at least. if anyone is considering this, please *do* consider prioritising getting the micro-desktop as well, i find it is very useful to have a working setup with the micro-desktop, separate from the laptop PCB, in a totally separate area of my desk. please also bear in mind, i am going through to a 2nd revision of all of the above PCBs, so we will be looking at about 2 months before these boards can go to a (larger) run - i wanted to give people an opportunity to say if they'd like to be involved. l.

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