Skip site navigation (1)Skip section navigation (2)
Date:      Tue, 14 Jul 2009 11:21:39 +0200
From:      Rafal Jaworowski <raj@semihalf.com>
To:        Hans Petter Selasky <hselasky@c2i.net>
Cc:        thompsa@freebsd.org, freebsd-arm@freebsd.org, Marcel Moolenaar <marcel@freebsd.org>, =?ISO-8859-2?Q?Piotr_Zi=EAcik?= <kosmo@semihalf.com>, freebsd-usb@freebsd.org
Subject:   Re: CPU Cache and busdma usage in USB
Message-ID:  <FB60465B-D714-4534-B07F-890C72A9CB33@semihalf.com>
In-Reply-To: <200907141036.44652.hselasky@c2i.net>
References:  <200906231035.43096.kosmo@semihalf.com> <200907091834.42462.hselasky@c2i.net> <200907141031.11185.kosmo@semihalf.com> <200907141036.44652.hselasky@c2i.net>

next in thread | previous in thread | raw e-mail | index | archive | help

On 2009-07-14, at 10:36, Hans Petter Selasky wrote:

> On Tuesday 14 July 2009 10:31:10 Piotr Zi=EAcik wrote:
>>> 1) My analysis: Only the data areas are being flushed/invalidated. =20=

>>> No
>>> transfer descriptors are flushed/invalidated. I see no cache =20
>>> operations
>>> happening on any DMA control structures, even though there are =20
>>> calls from
>>> EHCI to xxx_pc_flush() and xxx_pc_invalidate().
>>
>
>> Probaby you see more on your AT91 device as you know USB stack =20
>> internals.
>> Have you tried to bring up OHCI on you ARM board ?
>
> Not yet. I'm terribly busy with some LibUSB stuff headed for the 8-=20
> current
> release. As soon as I find time I will fire off a build and debug.

Please note these problems should be considered as a showstopper for =20
the release since USB is currently broken on at least three ARM =20
platforms in the tree (Marvell).

> BTW: Has pmap been fixed for ARM in 8-current?

Seems like the most critical problems (panics) are resolved and will =20
be pushed into SVN shortly. In case you'd like to apply the fix =20
directly, see: =
http://people.freebsd.org/~raj/patches/arm/pmap-fixes.diff

Rafal




Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?FB60465B-D714-4534-B07F-890C72A9CB33>