[Arm-netbook] EOMA68-jz4775 first usb-loader hello-world success

Luke Kenneth Casson Leighton lkcl at lkcl.net
Wed Jan 6 01:15:16 GMT 2016

On Tue, Jan 5, 2016 at 10:54 PM, Paul Boddie <paul at boddie.org.uk> wrote:
> On Tuesday 5. January 2016 21.21.57 Luke Kenneth Casson Leighton wrote:
>> 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
> Very encouraging! The CI20 bare-metal stuff is rather educational and it helps
> to explain various things that you can see in other code related to the
> Ingenic SoCs.

 yeah, it's kinda cool.  slightly scarily low-level and more like the
ST devkit, but very cool.

> It'll be interesting to see whether the jz4775 is close enough to the other
> SoCs for various initialisation things to work straight away with limited
> reconfiguration, perhaps even things like the framebuffer.

  first hardware difference is that the clock i'm running the
eoma68-jz4775 board off of is 24mhz not 48.

 i've managed to compile ingenic's jz4775 version of u-boot 1.1.6,
i'll be putting that onto an sd card tomorrow and changing the boot
selection to see if it recognises booting from MMC0.  that will help
confirm a heck of a lot of bits of hardware.


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