[OpenBIOS] usb driver to support usb keyboard

[BALATON Zoltan]

On Sun, 4 May 2014, Mark Cave-Ayland wrote:
> On 03/05/14 10:56, BALATON Zoltan wrote:
>> On Fri, 3 May 2014, Tarl Neustaedter wrote:
>>> I'm not volunteering to do the work (lest I hear my boss scream in
>>> agony), but I suspect this is a case that it just drops in and works.
>>> Lillian wrote it for the OneLaptop project, and I understand that
>>> implementation and OpenBios haven't diverged all that much.
>> 
>> Problem is I don't know where to drop it to try if it works and if it
>> doesn't I don't know how to debug Forth so I could only shoot in the
>> dark. I don't even know where to start with this Forth driver.

As this seems to be the preferred way I looked at it again to see if I can 
start trying to integrate the usb2 driver from openfirmwre but I still 
don't see where to start.

> Sadly the PCI code in OpenBIOS is still written in C so there would be some 
> interface work required there.
>
> In terms of testing the code, Forth is an interpreted language so you can 
> literally copy/paste from the source files into a serial console and see what 
> happens ;)  I suspect that the reality will be slightly different though, for 
> example we know that OpenFirmware has behaviours which aren't implemented in 
> OpenBIOS.

The usb driver is split into 75 *.fth files so it's not obvious what to 
paste in a console. Additionally there are some *.bth files that seem to 
build some FCode modules but these are not working on OpenBIOS as they 
contain words that I did not find in OpenBIOS. So I don't know how to get 
OpenBIOS's Forth at least try to interpret these files to see what is 
missing.

The ohci.bth file looks like this:

---begin---
purpose: Load file for OHCI HCD

command: &tokenize &this
build-now

silent on

begin-tokenizing ohci.fc

FCode-version2

" ohci" encode-string " device_type" property

fload ${BP}/dev/usb2/hcd/ohci/loadpkg.fth

end0

end-tokenizing
---end---

and the hcd/ohci/loadpkg.fth referenced here contains more fload commands 
that load the other parts. What is the equivalent in OpenBIOS's Forth to 
do this?

Regards,
BALATON Zoltan