FreeBSD/powerpc on MPC5200

Sun Aug 30 14:14:57 UTC 2009

On Sunday 30 August 2009 15:49:17 Daan Vreeken wrote:
> Hi Hans Petter,
>
> On Friday 28 August 2009 21:46:27 Hans Petter Selasky wrote:
> > On Friday 28 August 2009 21:27:28 Daan Vreeken wrote:
> > > Hi Rafal (and the list),
> > >
> > > On Sunday 24 May 2009 21:15:44 Rafal Jaworowski wrote:
> > > > On 2009-05-23, at 07:21, Andrew Turner wrote:
> > > > > On Fri, 22 May 2009 12:21:01 +0200
> > > > >
> > > > > Rafal Jaworowski <raj at semihalf.com> wrote:
> > > > >> On 2009-05-11, at 15:15, Peter Czanik wrote:
> > > > >>> Rafal Jaworowski írta:
> > > > >>>> I'd like to let people know that FreeBSD/powerpc is now able to
> > > > >>>> boot into single user on the Freescale MPC5200 system-on-chip
> > > > >>>> (EFIKA board). The environment is very simplistic: RAM disk
> > > > >>>> based root fs, as
> > > > >>>> there's no peripherals drivers besides serial console and the
> > > > >>>> built- in
> > > > >>>> PIC. See this log: http://people.freebsd.org/~raj/logs/efika.log
> > > > >>>
> > > > >>> Wow, great news! Two questions:
> > > > >>> - are there any plans to support additional devices?
> > > > >>
> > > > >> We don't have immediate plans for other devices drivers, but this
> > > > >> basic support will be merged into SVN, and it would be greatly
> > > > >> welcome to see people help with remaining items.
> > > > >
> > > > > Is there a patch available? I would like to get back to working on
> > > > > the EFIKA.
> > > >
> > > > Preliminary diff against 2009.04.06 HEAD is here:
> > > > http://people.freebsd.org/~raj/patches/powerpc/efika.diff
> > > >
> > > > Comments or questions welcome. Some bits need to be streamlined so
> > > > that all AIM/OF variations work together, and the code has to be
> > > > rebased against up-to-date HEAD.
> > >
> > > I have downloaded your diff and succesfully patched it to -HEAD
> > > (checked out on 2009-08-25).
> > > Right now I'm looking into getting the USB controller working. (That
> > > would allow me to use network & disks all in one go.)
> > >
> > > I have written the OHCI attachment code (inspired by a mix of Warner's
> > > atmel version, mpc5xxx/ic.c and uart_dev_psc.c) and gotten it to
> > > succesfully attach to the OHCI controller when booting the Efika board.
> > > USB is not (yet) working correctly. Near the end of ohci_init(), the
> > > board seems to halt completely for about 30 seconds and after that, the
> > > OHCI controller sets the 'unrecoverable error' flag.
> > >
> > > A complete dmesg dump can be found here :
> > > http://vehosting.nl/pub_diffs/efika-daan-2009-08-28-ohci_attaching_but_
> > >fa il ing.txt The kernel that produced this can be downloaded here :
> > > http://vehosting.nl/pub_diffs/efika-daan-2009-08-28-ohci_attaching_but_
> > >fa il ing.kernel
> > >
> > > The files I added/changed to get the attachment of the OHCI controller
> > > to 'work' can be found here :
> > > http://vehosting.nl/pub_diffs/efika-daan-2009-08-28_changed_files.tar.g
> > >z (Warning : Ugly! and full of printf's for now!)
> > > (I could have missed one, let me know if you can't get it to work.)
> > >
> > > The above dmesg shows a number of printf's I've added to ohci.c . My
> > > mutilated version can be found here :
> > > http://vehosting.nl/pub_diffs/efika-daan-2009-08-28_ohci.c
> > >
> > > As you can see, I printf() the interrupt status register at various
> > > points during ohci_init(). The 'unrecoverable error' flag gets set just
> > > a couple of miliseconds after the following command has been executed :
> > >
> > > 	/* And finally start it! */
> > > 	OWRITE4(sc, OHCI_CONTROL, ctl);
> > >
> > > After that OWRITE4(), the board sits for about 30 seconds and then
> > > continues. I'm just guessing what's going on here, but could it be that
> > > (one of?) the endpoint lists isn't properly setup and that the OHCI
> > > controller keeps the CPU from accessing memory while it's racing
> > > through memory following corrupt/invalid 'next' pointers?
> >
> > Maybe busdma is not computing correct physical addresses for the kernel
> > virtual memory loaded into DMA.
>
> I've looking closely at the logs I generated earlier and this doesn't seem
> to be the case (I think). The physical address of the HCCA (Host Controller
> Communications Area) looks the same and the frame_number counter is
> advancing in this memory area as soon as the controller is enabled.
> One thing that strikes me is the value of the frame number though :
>
> 	ohci_dumpregs:599: ohci_dumpregs: rev=0x00000010 control=0x00000093
> 		command=0x00000002
> 	ohci_dumpregs:603: intrstat=0x00000040 intre=0x8000005a intrd=0x8000005a
> 	ohci_dumpregs:607: hcca=0x01c12a00 percur=0x48000060 ctrlhd=0x01c20880
> 	ohci_dumpregs:611: ctrlcur=0x00000000 bulkhd=0x01c20800 bulkcur=0x00000000
> 	ohci_dumpregs:615: done=0x00000000 fmival=0xa7782edf fmrem=0x800025e7
> 	ohci_dumpregs:619: fmnum=0x000000e5 perst=0x00002a2f lsthrs=0x00000628
> 	ohci_dumpregs:623: desca=0x02001202 descb=0x00000000 stat=0x00000000
> 	ohci_dumpregs:626: port1=0x00100303 port2=0x00010101
> 	ohci_dumpregs:632: HCCA: frame_number=0x35fe0000 done_head=0x00000000
>
> The frame number at this particular moment is '0x35fe0000', though the OHCI
> spec says it should be a 16 bit counter, followed by 16 bits of padding
> (that should read back as '0').
>
> Could it be a big-endian controller, while the USB code expects
> little-endian?

Yes, that was it. Changing every 'htole32' into 'htobe32' and every 'le32toh' 
into 'be32toh' in  sys/dev/usb/controller/ohci.c gets the USB controller to 
work :

	...
	Timecounter "decrementer" frequency 33000000 Hz quality 0
	Timecounters tick every 10.000 msec
	usbus0: 12Mbps Full Speed USB v1.0
	Root mount waiting for: usbus0
	ugen0.1: <Freescale> at usbus0
	uhub0: <Freescale OHCI root HUB, class 9/0, rev 1.00/1.00, addr 1> on usbus0
	uhub0: 2 ports with 2 removable, self powered
	Root mount waiting for: usbus0
	ugen0.2: <Dell> at usbus0
	Root mount waiting for: usbus0
	ugen0.3: <Prolific Technology Inc.> at usbus0

(For those with an Efika board, here's a working kernel : 
http://vehosting.nl/pub_diffs/efika-daan-2009-08-30-usb-working.kernel )

-- 
Daan Vreeken
VEHosting
http://VEHosting.nl
tel: +31-(0)40-7113050 / +31-(0)6-46210825
KvK nr: 17174380