At91rm9200 how to start with FreeBSD

[Daan Vreeken [PA4DAN]]

On Monday 20 November 2006 23:03, Daan Vreeken [PA4DAN] wrote:
> Hi Warner (and the list),
>
> On Thursday 16 November 2006 17:36, M. Warner Losh wrote:
> > In message: <7380637.post at talk.nabble.com>
> >
> >             Zuy <zaitsevbros at mail.ru> writes:
> > : How I'm soldering board based on AT91RM9200 with 16mb SDRAM and othe
> > : standartpPeripherals(USB, SD, UART ...). I'm going to run FreeBSD on
> > : this board, but unfortunately I do not know how to start.
> > : I havn't found any files connected with AT91RM9200 in FreeBSD6.0 Stable
> > : source files directory.
> > : I found from this board that freebsd works on at91rm9200.
> >
> > Yes.  It does.  FreeBSD-current has the most up to date tested code
> > for this platform.  FreeBSD 6.2 will contain the tools you need to
> > build it, as well as a slightly less advanced version (the freeze date
> > for 6.2 was a while ago).  6.3 is likely to have even more advanced
> > support.
>
> ...
>
> > Here's the broad outlines.
>
> ... followed by a very nice ARM-introduction :) ...
>
> > Feel free to ask questions.  the more people that ask, the bigger my
> > collection of email on the topic gets, and the easier it will be for
> > me to synthesize a tutorial.  Also, if there are areas that I've been
> > vague, please don't hesitate to let me know.
>
> This email got me to dust-off the KB9202B board my company bought a while
> back for a project that hasn't started (yet). With your email it was quite
> easy to get the board to work. I now use the original Kwikbyte boot loader
> to load the kernel with tftp. After that the kernel mounts root over NFS
> and everything works like a charm.
> If I am going to use this board in the project it was intended for, we will
> need USB support, so I took a shot at getting USB working...

Stupid me, I pressed [ctrl+enter] while typing this email instead of [enter], 
so a piece of the intended story didn't make it into the first email :-s

The conclusion : I've got USB to work.
What I changed :
> o updated hints.at91rm9200 (ohci controller is on ASB)
o I've added a mapping for the OHCI controller in kb920x_machdep.c that
   maps the controller to 0xdfe00000 (just below where the IO region is
   mapped)

After enabling the ohci controller it crashed in usbd_transfer() because of 
missing device->bus->buffer_dmatag so I added :
> o allocate dma tags in ohci_atmelarm_attach()
>   (inspired by ohci_pci.c)
> o destroy dma tags in ohc_atmelarm_detach()

With these changes USB is now working on the board I have here. I have 
succesfully read the entire content of a memory stick inside a digital camera 
with it. There are some problems though (not sure yet where they come from). 
I have a if_axe device here that doesn't want to work. (Will investigate 
further).

Also, I'm not sure if I need to tell the kernel more about the VA/PA mapping I 
have added and wheter or not there is a better way/place to do the mapping.
Any comments are appreciated.
If time permits I'll try to implement a driver for the USB Device Port as it 
could also come in handy when we're going to use these boards.

btw: This work is sponsored by Vitsch Electronics.

--
Daan