[Letux-kernel] [OpenOCD-devel] [PATCH]: d86217d board: add Skytone Alpha 400

H. Nikolaus Schaller hns at goldelico.com
Sat Oct 24 16:26:43 CEST 2020

Hi Lubomir,

> Am 24.10.2020 um 15:35 schrieb Lubomir Rintel <lkundrak at v3.sk>:
> On Sat, Oct 24, 2020 at 08:53:13AM +0200, Daniel Glöckner wrote:
>> Hi,
>> On Fri, Oct 23, 2020 at 07:13:37PM +0100, gerrit wrote:
>>>    This adds the configuration for the MIPS subnotebook board that is known
>>>    by many names -- Skytone Alpha 400 seems to be the OEM name. The unit
>>>    I've tested this on was sold as "Elonex Onet+".
>> glad to see someone use my JZ4730 patches. Is there a public place
>> where people are coordinating open source development for the Onet+?
>> The Letux 400 mailing list unfortunately fell silent.

The specific list was replaced by the letux-kernel devel mailing
list because the kernel tree now covers a big set of different devices in
parallel. So there was no need any more for device specific lists (at least
on kernel level).

I have CCed the list plus two GNUsteppers from whom I know that they
are still interested in MIPS and this machine.

> I don't know. I guess you're referring to mipsbook-devel? It indeed
> looks silent.

Yes, that list is silent as well.

> It's perhaps because the hardware, be it rather nifty, is
> now slightly aged.
> I've only recently got the machine and started to look around. I'd like
> it to eventually run up to date software, notably mainline Linux.
> I'm currently beating u-boot into shape and intend to try send out the
> patches upstream soonish.
> I've noticed that H. Nikolaus Schaller keeps rebasing his and Paul
> Boddie's jz4730 patches in the letux-kernel tree [1].

We try to do our best...

> I've had to fix up
> quite some issues to get the thing to build so I suspect they probably
> don't run it?

Well, it is unfortunately on really low priority for me. I just would have
to open my Letux 400 and solder a connector for the serial console and close the
device again :) So that I can see what is happening during hand-over from 
U-Boot to the kernel or if the kernel isn't booting to at least some login: prompt.

Unfortunately a lot of documentation about these devices has been lost.
AFAIR there was Kwaak (some early public Wiki) and the wayback machine has archived
some parts, but for example I could no longer find the photos about

Another problem is that I am no longer experienced in the details how to
boot from SD card... AFAIR there was some special key combination and if
one get it wrong the system will overwrite flash where only JTAG could
recover the bricked device.

A minor problem is that the remaining batteries are now all broken, but it
works without, just with power supply.

> My intent was to send the patches their way and ask about
> the status of the tree; adding them to Cc now so they can chime in.

Yes, please. Patches are always welcome!

> [1] https://git.goldelico.com/?p=letux-kernel.git;a=heads
>> I found a few years ago that the FCC registration document for the
>> Skytone Alpha 400 (FCC ID WMGALPHA400) simply points to the Sungworld
>> SW-E700 (FCC ID WI3SW-E700). The Sungworld FCC database entry has a
>> schematic attached.
> I've got the schematic from here [2]. It looks like it's probably the
> same one.

> [2] https://download.goldelico.com/letux-400/files/

Hardware-wise these devices (Skytone, Elonex, Letux and many more) seem
to be the same.

>> Best regards,
>>  Daniel
> Take care
> Lubo

BR and take care,

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