[Arm-netbook] microSD breakout board, suitable for debugging using tablets.

[Alejandro Martínez]

I managed to make the serial console work on my Ainol Novo7Advanced
with your instructions at http://elinux.org/Hack_A10_devices :D

Some pictures of my setup: http://imgur.com/a/qkbFA

I could get the kernel to boot from the Ubuntu root (I extracted it on
top of /data and used the recovery kernel params, then booted using
the volume key), and also the nano wifi modules working and connected
to a wireless network (it has to be insmodded with a parameter
pointing to the firmware folder), but after I insmod the modules for
the LCD and mali (found on init.sun4i.rc), the system freezes after
some seconds (the framebuffer works as quickly doing yes>/dev/fb0
outputs pink). The same kernel and modules (the kernel on that lichee
tar.gz) work flawlessly on Android, so I don't know what's going on.

Do you know what modules have to be loaded for the display to work (or
in what order)? using modprobe instead of insmod (after running
depmod) also makes the system freeze.

Also, running "top" showed ~370mb of total RAM if I remember well..
instead of the 512mb the tablet is supposed to have

I used a Ubuntu Core image:
http://cdimage.ubuntu.com/ubuntu-core/releases/11.10/release/ubuntu-core-11.10-core-amd64.tar.gz

extracted to /data, with the root password disabled on /etc/shadow and
those instructions for enabling a shell on the serial console:
http://omappedia.org/wiki/OMAP_Ubuntu_Core#Getting_a_Terminal_on_the_same_serial_port_as_for_the_console

and then modified the linux/paramsr to make it use the data nand
partition instead of the recoveryo ne.


Will try to document everything on the wiki when I have time :)


Alejandro

On Mon, Feb 13, 2012 at 7:52 AM, Tom Cubie <tangliang at allwinnertech.com> wrote:
> On 02/13/2012 12:38 PM, lkcl luke wrote:
>
> On Mon, Feb 13, 2012 at 2:06 AM, Tom Cubie <tangliang at allwinnertech.com>
> wrote:
>
> On 02/13/2012 09:43 AM, lkcl luke wrote:
>
> On Mon, Feb 13, 2012 at 1:18 AM, Tom Cubie<tangliang at allwinnertech.com>
>  wrote:
>
> I can get the lcd console either. I have reported to the girl who
> workson the display driver the problem. She is not interested and
> will not look at it. She said it's no use in products :(
>
>   what, screens are of no use??
>
> She means fb console,
>
>  ahh ok.  hm, that should be pretty straightforward.
>
> showing the little penguin at boot time is
> no use in products. The lcd driver is ok when playing some test
> videos under linux cli, no display for the console.
>
>  it's usually pretty straightforward to get that up-and-running, boot
> params console=/dev/fb0 which obviously you can either set in the
> kernel config or directly into the linux kernel source code as the
> default _or_ set them in u-boot.  but you *have* to have the lcd etc.
> etc. "built-in" you cannot possibly hope to have that work if you've
> got it as a module, because, duh, it won't be loaded when it's needed,
> will it?? :)
>
>  btw if you've got a "working" system that you can actually boot up
> and get any kind of login / command-prompt (ssh over ethernet, serial
> console) then my favourite trick to see if things are working is just
> "echo shfjsafhajsfhsajfsadlf > /dev/fb0" - if you see garbage in the
> top left corner of the lcd, it's working.
>
>  get that working first _then_ try sorting out the boot parameters.
>
> l.
>
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>
>
> Thank you for your clear explanation. I can get something on the lcd
> when i "cat /dev/urandom > /dev/fb0". But as long as i open the kernel
> config "Framebuffer Console support" the kernel can not boot up, and
> hang at "[LCD] lcd_module_init". There is some problem of the display
> driver. And after complaining many times to her(her seat is next to me),
> she agreed to look at it when she has time.
>
>
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